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FFMPEG-FORMATS(1)					     FFMPEG-FORMATS(1)

NAME
       ffmpeg-formats -	FFmpeg formats

DESCRIPTION
       This document describes the supported formats (muxers and demuxers)
       provided	by the libavformat library.

FORMAT OPTIONS
       The libavformat library provides	some generic global options, which can
       be set on all the muxers	and demuxers. In addition each muxer or
       demuxer may support so-called private options, which are	specific for
       that component.

       Options may be set by specifying	-option	value in the FFmpeg tools, or
       by setting the value explicitly in the "AVFormatContext"	options	or
       using the libavutil/opt.h API for programmatic use.

       The list	of supported options follows:

       avioflags flags (input/output)
	   Possible values:

	   direct
	       Reduce buffering.

       probesize integer (input)
	   Set probing size in bytes, i.e. the size of the data	to analyze to
	   get stream information. A higher value will enable detecting	more
	   information in case it is dispersed into the	stream,	but will
	   increase latency. Must be an	integer	not lesser than	32. It is
	   5000000 by default.

       packetsize integer (output)
	   Set packet size.

       fflags flags (input/output)
	   Set format flags.

	   Possible values:

	   ignidx
	       Ignore index.

	   fastseek
	       Enable fast, but	inaccurate seeks for some formats.

	   genpts
	       Generate	PTS.

	   nofillin
	       Do not fill in missing values that can be exactly calculated.

	   noparse
	       Disable AVParsers, this needs "+nofillin" too.

	   igndts
	       Ignore DTS.

	   discardcorrupt
	       Discard corrupted frames.

	   sortdts
	       Try to interleave output	packets	by DTS.

	   keepside
	       Do not merge side data.

	   latm
	       Enable RTP MP4A-LATM payload.

	   nobuffer
	       Reduce the latency introduced by	optional buffering

	   bitexact
	       Only write platform-, build- and	time-independent data.	This
	       ensures that file and data checksums are	reproducible and match
	       between platforms. Its primary use is for regression testing.

	   shortest
	       Stop muxing at the end of the shortest stream.  It may be
	       needed to increase max_interleave_delta to avoid	flushing the
	       longer streams before EOF.

       seek2any	integer	(input)
	   Allow seeking to non-keyframes on demuxer level when	supported if
	   set to 1.  Default is 0.

       analyzeduration integer (input)
	   Specify how many microseconds are analyzed to probe the input. A
	   higher value	will enable detecting more accurate information, but
	   will	increase latency. It defaults to 5,000,000 microseconds	= 5
	   seconds.

       cryptokey hexadecimal string (input)
	   Set decryption key.

       indexmem	integer	(input)
	   Set max memory used for timestamp index (per	stream).

       rtbufsize integer (input)
	   Set max memory used for buffering real-time frames.

       fdebug flags (input/output)
	   Print specific debug	info.

	   Possible values:

	   ts
       max_delay integer (input/output)
	   Set maximum muxing or demuxing delay	in microseconds.

       fpsprobesize integer (input)
	   Set number of frames	used to	probe fps.

       audio_preload integer (output)
	   Set microseconds by which audio packets should be interleaved
	   earlier.

       chunk_duration integer (output)
	   Set microseconds for	each chunk.

       chunk_size integer (output)
	   Set size in bytes for each chunk.

       err_detect, f_err_detect	flags (input)
	   Set error detection flags. "f_err_detect" is	deprecated and should
	   be used only	via the	ffmpeg tool.

	   Possible values:

	   crccheck
	       Verify embedded CRCs.

	   bitstream
	       Detect bitstream	specification deviations.

	   buffer
	       Detect improper bitstream length.

	   explode
	       Abort decoding on minor error detection.

	   careful
	       Consider	things that violate the	spec and have not been seen in
	       the wild	as errors.

	   compliant
	       Consider	all spec non compliancies as errors.

	   aggressive
	       Consider	things that a sane encoder should not do as an error.

       max_interleave_delta integer (output)
	   Set maximum buffering duration for interleaving. The	duration is
	   expressed in	microseconds, and defaults to 1000000 (1 second).

	   To ensure all the streams are interleaved correctly,	libavformat
	   will	wait until it has at least one packet for each stream before
	   actually writing any	packets	to the output file. When some streams
	   are "sparse"	(i.e. there are	large gaps between successive
	   packets), this can result in	excessive buffering.

	   This	field specifies	the maximum difference between the timestamps
	   of the first	and the	last packet in the muxing queue, above which
	   libavformat will output a packet regardless of whether it has
	   queued a packet for all the streams.

	   If set to 0,	libavformat will continue buffering packets until it
	   has a packet	for each stream, regardless of the maximum timestamp
	   difference between the buffered packets.

       use_wallclock_as_timestamps integer (input)
	   Use wallclock as timestamps if set to 1. Default is 0.

       avoid_negative_ts integer (output)
	   Possible values:

	   make_non_negative
	       Shift timestamps	to make	them non-negative.  Also note that
	       this affects only leading negative timestamps, and not non-
	       monotonic negative timestamps.

	   make_zero
	       Shift timestamps	so that	the first timestamp is 0.

	   auto	(default)
	       Enables shifting	when required by the target format.

	   disabled
	       Disables	shifting of timestamp.

	   When	shifting is enabled, all output	timestamps are shifted by the
	   same	amount.	Audio, video, and subtitles desynching and relative
	   timestamp differences are preserved compared	to how they would have
	   been	without	shifting.

       skip_initial_bytes integer (input)
	   Set number of bytes to skip before reading header and frames	if set
	   to 1.  Default is 0.

       correct_ts_overflow integer (input)
	   Correct single timestamp overflows if set to	1. Default is 1.

       flush_packets integer (output)
	   Flush the underlying	I/O stream after each packet. Default 1
	   enables it, and has the effect of reducing the latency; 0 disables
	   it and may slightly increase	performance in some cases.

       output_ts_offset	offset (output)
	   Set the output time offset.

	   offset must be a time duration specification, see the Time duration
	   section in the ffmpeg-utils(1) manual.

	   The offset is added by the muxer to the output timestamps.

	   Specifying a	positive offset	means that the corresponding streams
	   are delayed bt the time duration specified in offset. Default value
	   is 0	(meaning that no offset	is applied).

       format_whitelist	list (input)
	   "," separated list of allowed demuxers. By default all are allowed.

       dump_separator string (input)
	   Separator used to separate the fields printed on the	command	line
	   about the Stream parameters.	 For example to	separate the fields
	   with	newlines and indention:

		   ffprobe -dump_separator "
					     "	-i ~/videos/matrixbench_mpeg2.mpg

       max_streams integer (input)
	   Specifies the maximum number	of streams. This can be	used to	reject
	   files that would require too	many resources due to a	large number
	   of streams.

   Format stream specifiers
       Format stream specifiers	allow selection	of one or more streams that
       match specific properties.

       Possible	forms of stream	specifiers are:

       stream_index
	   Matches the stream with this	index.

       stream_type[:stream_index]
	   stream_type is one of following: 'v'	for video, 'a' for audio, 's'
	   for subtitle, 'd' for data, and 't' for attachments.	If
	   stream_index	is given, then it matches the stream number
	   stream_index	of this	type. Otherwise, it matches all	streams	of
	   this	type.

       p:program_id[:stream_index]
	   If stream_index is given, then it matches the stream	with number
	   stream_index	in the program with the	id program_id. Otherwise, it
	   matches all streams in the program.

       #stream_id
	   Matches the stream by a format-specific ID.

       The exact semantics of stream specifiers	is defined by the
       "avformat_match_stream_specifier()" function declared in	the
       libavformat/avformat.h header.

DEMUXERS
       Demuxers	are configured elements	in FFmpeg that can read	the multimedia
       streams from a particular type of file.

       When you	configure your FFmpeg build, all the supported demuxers	are
       enabled by default. You can list	all available ones using the configure
       option "--list-demuxers".

       You can disable all the demuxers	using the configure option
       "--disable-demuxers", and selectively enable a single demuxer with the
       option "--enable-demuxer=DEMUXER", or disable it	with the option
       "--disable-demuxer=DEMUXER".

       The option "-demuxers" of the ff* tools will display the	list of
       enabled demuxers. Use "-formats"	to view	a combined list	of enabled
       demuxers	and muxers.

       The description of some of the currently	available demuxers follows.

   aa
       Audible Format 2, 3, and	4 demuxer.

       This demuxer is used to demux Audible Format 2, 3, and 4	(.aa) files.

   applehttp
       Apple HTTP Live Streaming demuxer.

       This demuxer presents all AVStreams from	all variant streams.  The id
       field is	set to the bitrate variant index number. By setting the
       discard flags on	AVStreams (by pressing 'a' or 'v' in ffplay), the
       caller can decide which variant streams to actually receive.  The total
       bitrate of the variant that the stream belongs to is available in a
       metadata	key named "variant_bitrate".

   apng
       Animated	Portable Network Graphics demuxer.

       This demuxer is used to demux APNG files.  All headers, but the PNG
       signature, up to	(but not including) the	first fcTL chunk are
       transmitted as extradata.  Frames are then split	as being all the
       chunks between two fcTL ones, or	between	the last fcTL and IEND chunks.

       -ignore_loop bool
	   Ignore the loop variable in the file	if set.

       -max_fps	int
	   Maximum framerate in	frames per second (0 for no limit).

       -default_fps int
	   Default framerate in	frames per second when none is specified in
	   the file (0 meaning as fast as possible).

   asf
       Advanced	Systems	Format demuxer.

       This demuxer is used to demux ASF files and MMS network streams.

       -no_resync_search bool
	   Do not try to resynchronize by looking for a	certain	optional start
	   code.

   concat
       Virtual concatenation script demuxer.

       This demuxer reads a list of files and other directives from a text
       file and	demuxes	them one after the other, as if	all their packets had
       been muxed together.

       The timestamps in the files are adjusted	so that	the first file starts
       at 0 and	each next file starts where the	previous one finishes. Note
       that it is done globally	and may	cause gaps if all streams do not have
       exactly the same	length.

       All files must have the same streams (same codecs, same time base,
       etc.).

       The duration of each file is used to adjust the timestamps of the next
       file: if	the duration is	incorrect (because it was computed using the
       bit-rate	or because the file is truncated, for example),	it can cause
       artifacts. The "duration" directive can be used to override the
       duration	stored in each file.

       Syntax

       The script is a text file in extended-ASCII, with one directive per
       line.  Empty lines, leading spaces and lines starting with '#' are
       ignored.	The following directive	is recognized:

       "file path"
	   Path	to a file to read; special characters and spaces must be
	   escaped with	backslash or single quotes.

	   All subsequent file-related directives apply	to that	file.

       "ffconcat version 1.0"
	   Identify the	script type and	version. It also sets the safe option
	   to 1	if it was -1.

	   To make FFmpeg recognize the	format automatically, this directive
	   must	appear exactly as is (no extra space or	byte-order-mark) on
	   the very first line of the script.

       "duration dur"
	   Duration of the file. This information can be specified from	the
	   file; specifying it here may	be more	efficient or help if the
	   information from the	file is	not available or accurate.

	   If the duration is set for all files, then it is possible to	seek
	   in the whole	concatenated video.

       "inpoint	timestamp"
	   In point of the file. When the demuxer opens	the file it instantly
	   seeks to the	specified timestamp. Seeking is	done so	that all
	   streams can be presented successfully at In point.

	   This	directive works	best with intra	frame codecs, because for non-
	   intra frame ones you	will usually get extra packets before the
	   actual In point and the decoded content will	most likely contain
	   frames before In point too.

	   For each file, packets before the file In point will	have
	   timestamps less than	the calculated start timestamp of the file
	   (negative in	case of	the first file), and the duration of the files
	   (if not specified by	the "duration" directive) will be reduced
	   based on their specified In point.

	   Because of potential	packets	before the specified In	point, packet
	   timestamps may overlap between two concatenated files.

       "outpoint timestamp"
	   Out point of	the file. When the demuxer reaches the specified
	   decoding timestamp in any of	the streams, it	handles	it as an end
	   of file condition and skips the current and all the remaining
	   packets from	all streams.

	   Out point is	exclusive, which means that the	demuxer	will not
	   output packets with a decoding timestamp greater or equal to	Out
	   point.

	   This	directive works	best with intra	frame codecs and formats where
	   all streams are tightly interleaved.	For non-intra frame codecs you
	   will	usually	get additional packets with presentation timestamp
	   after Out point therefore the decoded content will most likely
	   contain frames after	Out point too. If your streams are not tightly
	   interleaved you may not get all the packets from all	streams	before
	   Out point and you may only will be able to decode the earliest
	   stream until	Out point.

	   The duration	of the files (if not specified by the "duration"
	   directive) will be reduced based on their specified Out point.

       "file_packet_metadata key=value"
	   Metadata of the packets of the file.	The specified metadata will be
	   set for each	file packet. You can specify this directive multiple
	   times to add	multiple metadata entries.

       "stream"
	   Introduce a stream in the virtual file.  All	subsequent stream-
	   related directives apply to the last	introduced stream.  Some
	   streams properties must be set in order to allow identifying	the
	   matching streams in the subfiles.  If no streams are	defined	in the
	   script, the streams from the	first file are copied.

       "exact_stream_id	id"
	   Set the id of the stream.  If this directive	is given, the string
	   with	the corresponding id in	the subfiles will be used.  This is
	   especially useful for MPEG-PS (VOB) files, where the	order of the
	   streams is not reliable.

       Options

       This demuxer accepts the	following option:

       safe
	   If set to 1,	reject unsafe file paths. A file path is considered
	   safe	if it does not contain a protocol specification	and is
	   relative and	all components only contain characters from the
	   portable character set (letters, digits, period, underscore and
	   hyphen) and have no period at the beginning of a component.

	   If set to 0,	any file name is accepted.

	   The default is 1.

	   -1 is equivalent to 1 if the	format was automatically probed	and 0
	   otherwise.

       auto_convert
	   If set to 1,	try to perform automatic conversions on	packet data to
	   make	the streams concatenable.  The default is 1.

	   Currently, the only conversion is adding the	h264_mp4toannexb
	   bitstream filter to H.264 streams in	MP4 format. This is necessary
	   in particular if there are resolution changes.

       segment_time_metadata
	   If set to 1,	every packet will contain the lavf.concat.start_time
	   and the lavf.concat.duration	packet metadata	values which are the
	   start_time and the duration of the respective file segments in the
	   concatenated	output expressed in microseconds. The duration
	   metadata is only set	if it is known based on	the concat file.  The
	   default is 0.

       Examples

       o   Use absolute	filenames and include some comments:

		   # my	first filename
		   file	/mnt/share/file-1.wav
		   # my	second filename	including whitespace
		   file	'/mnt/share/file 2.wav'
		   # my	third filename including whitespace plus single	quote
		   file	'/mnt/share/file 3'\''.wav'

       o   Allow for input format auto-probing,	use safe filenames and set the
	   duration of the first file:

		   ffconcat version 1.0

		   file	file-1.wav
		   duration 20.0

		   file	subdir/file-2.wav

   flv,	live_flv
       Adobe Flash Video Format	demuxer.

       This demuxer is used to demux FLV files and RTMP	network	streams. In
       case of live network streams, if	you force format, you may use live_flv
       option instead of flv to	survive	timestamp discontinuities.

	       ffmpeg -f flv -i	myfile.flv ...
	       ffmpeg -f live_flv -i rtmp://<any.server>/anything/key ....

       -flv_metadata bool
	   Allocate the	streams	according to the onMetaData array content.

   gif
       Animated	GIF demuxer.

       It accepts the following	options:

       min_delay
	   Set the minimum valid delay between frames in hundredths of
	   seconds.  Range is 0	to 6000. Default value is 2.

       max_gif_delay
	   Set the maximum valid delay between frames in hundredth of seconds.
	   Range is 0 to 65535.	Default	value is 65535 (nearly eleven
	   minutes), the maximum value allowed by the specification.

       default_delay
	   Set the default delay between frames	in hundredths of seconds.
	   Range is 0 to 6000. Default value is	10.

       ignore_loop
	   GIF files can contain information to	loop a certain number of times
	   (or infinitely). If ignore_loop is set to 1,	then the loop setting
	   from	the input will be ignored and looping will not occur. If set
	   to 0, then looping will occur and will cycle	the number of times
	   according to	the GIF. Default value is 1.

       For example, with the overlay filter, place an infinitely looping GIF
       over another video:

	       ffmpeg -i input.mp4 -ignore_loop	0 -i input.gif -filter_complex overlay=shortest=1 out.mkv

       Note that in the	above example the shortest option for overlay filter
       is used to end the output video at the length of	the shortest input
       file, which in this case	is input.mp4 as	the GIF	in this	example	loops
       infinitely.

   image2
       Image file demuxer.

       This demuxer reads from a list of image files specified by a pattern.
       The syntax and meaning of the pattern is	specified by the option
       pattern_type.

       The pattern may contain a suffix	which is used to automatically
       determine the format of the images contained in the files.

       The size, the pixel format, and the format of each image	must be	the
       same for	all the	files in the sequence.

       This demuxer accepts the	following options:

       framerate
	   Set the frame rate for the video stream. It defaults	to 25.

       loop
	   If set to 1,	loop over the input. Default value is 0.

       pattern_type
	   Select the pattern type used	to interpret the provided filename.

	   pattern_type	accepts	one of the following values.

	   none
	       Disable pattern matching, therefore the video will only contain
	       the specified image. You	should use this	option if you do not
	       want to create sequences	from multiple images and your
	       filenames may contain special pattern characters.

	   sequence
	       Select a	sequence pattern type, used to specify a sequence of
	       files indexed by	sequential numbers.

	       A sequence pattern may contain the string "%d" or "%0Nd", which
	       specifies the position of the characters	representing a
	       sequential number in each filename matched by the pattern. If
	       the form	"%d0Nd"	is used, the string representing the number in
	       each filename is	0-padded and N is the total number of 0-padded
	       digits representing the number. The literal character '%' can
	       be specified in the pattern with	the string "%%".

	       If the sequence pattern contains	"%d" or	"%0Nd",	the first
	       filename	of the file list specified by the pattern must contain
	       a number	inclusively contained between start_number and
	       start_number+start_number_range-1, and all the following
	       numbers must be sequential.

	       For example the pattern "img-%03d.bmp" will match a sequence of
	       filenames of the	form img-001.bmp, img-002.bmp, ...,
	       img-010.bmp, etc.; the pattern "i%%m%%g-%d.jpg" will match a
	       sequence	of filenames of	the form i%m%g-1.jpg, i%m%g-2.jpg,
	       ..., i%m%g-10.jpg, etc.

	       Note that the pattern must not necessarily contain "%d" or
	       "%0Nd", for example to convert a	single image file img.jpeg you
	       can employ the command:

		       ffmpeg -i img.jpeg img.png

	   glob
	       Select a	glob wildcard pattern type.

	       The pattern is interpreted like a "glob()" pattern. This	is
	       only selectable if libavformat was compiled with	globbing
	       support.

	   glob_sequence (deprecated, will be removed)
	       Select a	mixed glob wildcard/sequence pattern.

	       If your version of libavformat was compiled with	globbing
	       support,	and the	provided pattern contains at least one glob
	       meta character among "%*?[]{}" that is preceded by an unescaped
	       "%", the	pattern	is interpreted like a "glob()" pattern,
	       otherwise it is interpreted like	a sequence pattern.

	       All glob	special	characters "%*?[]{}" must be prefixed with
	       "%". To escape a	literal	"%" you	shall use "%%".

	       For example the pattern "foo-%*.jpeg" will match	all the
	       filenames prefixed by "foo-" and	terminating with ".jpeg", and
	       "foo-%?%?%?.jpeg" will match all	the filenames prefixed with
	       "foo-", followed	by a sequence of three characters, and
	       terminating with	".jpeg".

	       This pattern type is deprecated in favor	of glob	and sequence.

	   Default value is glob_sequence.

       pixel_format
	   Set the pixel format	of the images to read. If not specified	the
	   pixel format	is guessed from	the first image	file in	the sequence.

       start_number
	   Set the index of the	file matched by	the image file pattern to
	   start to read from. Default value is	0.

       start_number_range
	   Set the index interval range	to check when looking for the first
	   image file in the sequence, starting	from start_number. Default
	   value is 5.

       ts_from_file
	   If set to 1,	will set frame timestamp to modification time of image
	   file. Note that monotonity of timestamps is not provided: images go
	   in the same order as	without	this option. Default value is 0.  If
	   set to 2, will set frame timestamp to the modification time of the
	   image file in nanosecond precision.

       video_size
	   Set the video size of the images to read. If	not specified the
	   video size is guessed from the first	image file in the sequence.

       Examples

       o   Use ffmpeg for creating a video from	the images in the file
	   sequence img-001.jpeg, img-002.jpeg,	..., assuming an input frame
	   rate	of 10 frames per second:

		   ffmpeg -framerate 10	-i 'img-%03d.jpeg' out.mkv

       o   As above, but start by reading from a file with index 100 in	the
	   sequence:

		   ffmpeg -framerate 10	-start_number 100 -i 'img-%03d.jpeg' out.mkv

       o   Read	images matching	the "*.png" glob pattern , that	is all the
	   files terminating with the ".png" suffix:

		   ffmpeg -framerate 10	-pattern_type glob -i "*.png" out.mkv

   libgme
       The Game	Music Emu library is a collection of video game	music file
       emulators.

       See <http://code.google.com/p/game-music-emu/> for more information.

       Some files have multiple	tracks.	The demuxer will pick the first	track
       by default. The track_index option can be used to select	a different
       track. Track indexes start at 0.	The demuxer exports the	number of
       tracks as tracks	meta data entry.

       For very	large files, the max_size option may have to be	adjusted.

   libopenmpt
       libopenmpt based	module demuxer

       See <https://lib.openmpt.org/libopenmpt/> for more information.

       Some files have multiple	subsongs (tracks) this can be set with the
       subsong option.

       It accepts the following	options:

       subsong
	   Set the subsong index. This can be either  'all', 'auto', or	the
	   index of the	subsong. Subsong indexes start at 0. The default is
	   'auto'.

	   The default value is	to let libopenmpt choose.

       layout
	   Set the channel layout. Valid values	are 1, 2, and 4	channel
	   layouts.  The default value is STEREO.

       sample_rate
	   Set the sample rate for libopenmpt to output.  Range	is from	1000
	   to INT_MAX. The value default is 48000.

   mov/mp4/3gp/QuickTime
       QuickTime / MP4 demuxer.

       This demuxer accepts the	following options:

       enable_drefs
	   Enable loading of external tracks, disabled by default.  Enabling
	   this	can theoretically leak information in some use cases.

       use_absolute_path
	   Allows loading of external tracks via absolute paths, disabled by
	   default.  Enabling this poses a security risk. It should only be
	   enabled if the source is known to be	non malicious.

   mpegts
       MPEG-2 transport	stream demuxer.

       This demuxer accepts the	following options:

       resync_size
	   Set size limit for looking up a new synchronization.	Default	value
	   is 65536.

       fix_teletext_pts
	   Override teletext packet PTS	and DTS	values with the	timestamps
	   calculated from the PCR of the first	program	which the teletext
	   stream is part of and is not	discarded. Default value is 1, set
	   this	option to 0 if you want	your teletext packet PTS and DTS
	   values untouched.

       ts_packetsize
	   Output option carrying the raw packet size in bytes.	 Show the
	   detected raw	packet size, cannot be set by the user.

       scan_all_pmts
	   Scan	and combine all	PMTs. The value	is an integer with value from
	   -1 to 1 (-1 means automatic setting,	1 means	enabled, 0 means
	   disabled). Default value is -1.

   mpjpeg
       MJPEG encapsulated in multi-part	MIME demuxer.

       This demuxer allows reading of MJPEG, where each	frame is represented
       as a part of multipart/x-mixed-replace stream.

       strict_mime_boundary
	   Default implementation applies a relaxed standard to	multi-part
	   MIME	boundary detection, to prevent regression with numerous
	   existing endpoints not generating a proper MIME MJPEG stream.
	   Turning this	option on by setting it	to 1 will result in a stricter
	   check of the	boundary value.

   rawvideo
       Raw video demuxer.

       This demuxer allows one to read raw video data. Since there is no
       header specifying the assumed video parameters, the user	must specify
       them in order to	be able	to decode the data correctly.

       This demuxer accepts the	following options:

       framerate
	   Set input video frame rate. Default value is	25.

       pixel_format
	   Set the input video pixel format. Default value is "yuv420p".

       video_size
	   Set the input video size. This value	must be	specified explicitly.

       For example to read a rawvideo file input.raw with ffplay, assuming a
       pixel format of "rgb24",	a video	size of	"320x240", and a frame rate of
       10 images per second, use the command:

	       ffplay -f rawvideo -pixel_format	rgb24 -video_size 320x240 -framerate 10	input.raw

   sbg
       SBaGen script demuxer.

       This demuxer reads the script language used by SBaGen
       <http://uazu.net/sbagen/> to generate binaural beats sessions. A	SBG
       script looks like that:

	       -SE
	       a: 300-2.5/3 440+4.5/0
	       b: 300-2.5/0 440+4.5/3
	       off: -
	       NOW	== a
	       +0:07:00	== b
	       +0:14:00	== a
	       +0:21:00	== b
	       +0:30:00	   off

       A SBG script can	mix absolute and relative timestamps. If the script
       uses either only	absolute timestamps (including the script start	time)
       or only relative	ones, then its layout is fixed,	and the	conversion is
       straightforward.	On the other hand, if the script mixes both kind of
       timestamps, then	the NOW	reference for relative timestamps will be
       taken from the current time of day at the time the script is read, and
       the script layout will be frozen	according to that reference. That
       means that if the script	is directly played, the	actual times will
       match the absolute timestamps up	to the sound controller's clock
       accuracy, but if	the user somehow pauses	the playback or	seeks, all
       times will be shifted accordingly.

   tedcaptions
       JSON captions used for <http://www.ted.com/>.

       TED does	not provide links to the captions, but they can	be guessed
       from the	page. The file tools/bookmarklets.html from the	FFmpeg source
       tree contains a bookmarklet to expose them.

       This demuxer accepts the	following option:

       start_time
	   Set the start time of the TED talk, in milliseconds.	The default is
	   15000 (15s).	It is used to sync the captions	with the downloadable
	   videos, because they	include	a 15s intro.

       Example:	convert	the captions to	a format most players understand:

	       ffmpeg -i http://www.ted.com/talks/subtitles/id/1/lang/en talk1-en.srt

MUXERS
       Muxers are configured elements in FFmpeg	which allow writing multimedia
       streams to a particular type of file.

       When you	configure your FFmpeg build, all the supported muxers are
       enabled by default. You can list	all available muxers using the
       configure option	"--list-muxers".

       You can disable all the muxers with the configure option
       "--disable-muxers" and selectively enable / disable single muxers with
       the options "--enable-muxer=MUXER" / "--disable-muxer=MUXER".

       The option "-muxers" of the ff* tools will display the list of enabled
       muxers. Use "-formats" to view a	combined list of enabled demuxers and
       muxers.

       A description of	some of	the currently available	muxers follows.

   aiff
       Audio Interchange File Format muxer.

       Options

       It accepts the following	options:

       write_id3v2
	   Enable ID3v2	tags writing when set to 1. Default is 0 (disabled).

       id3v2_version
	   Select ID3v2	version	to write. Currently only version 3 and 4 (aka.
	   ID3v2.3 and ID3v2.4)	are supported. The default is version 4.

   asf
       Advanced	Systems	Format muxer.

       Note that Windows Media Audio (wma) and Windows Media Video (wmv) use
       this muxer too.

       Options

       It accepts the following	options:

       packet_size
	   Set the muxer packet	size. By tuning	this setting you may reduce
	   data	fragmentation or muxer overhead	depending on your source.
	   Default value is 3200, minimum is 100, maximum is 64k.

   avi
       Audio Video Interleaved muxer.

       Options

       It accepts the following	options:

       reserve_index_space
	   Reserve the specified amount	of bytes for the OpenDML master	index
	   of each stream within the file header. By default additional	master
	   indexes are embedded	within the data	packets	if there is no space
	   left	in the first master index and are linked together as a chain
	   of indexes. This index structure can	cause problems for some	use
	   cases, e.g. third-party software strictly relying on	the OpenDML
	   index specification or when file seeking is slow. Reserving enough
	   index space in the file header avoids these problems.

	   The required	index space depends on the output file size and	should
	   be about 16 bytes per gigabyte. When	this option is omitted or set
	   to zero the necessary index space is	guessed.

       write_channel_mask
	   Write the channel layout mask into the audio	stream header.

	   This	option is enabled by default. Disabling	the channel mask can
	   be useful in	specific scenarios, e.g. when merging multiple audio
	   streams into	one for	compatibility with software that only supports
	   a single audio stream in AVI	(see the "amerge" section in the
	   ffmpeg-filters manual).

   chromaprint
       Chromaprint fingerprinter

       This muxer feeds	audio data to the Chromaprint library, which generates
       a fingerprint for the provided audio data. It takes a single signed
       native-endian 16-bit raw	audio stream.

       Options

       silence_threshold
	   Threshold for detecting silence, ranges from	0 to 32767. -1 for
	   default (required for use with the AcoustID service).

       algorithm
	   Algorithm index to fingerprint with.

       fp_format
	   Format to output the	fingerprint as.	Accepts	the following options:

	   raw Binary raw fingerprint

	   compressed
	       Binary compressed fingerprint

	   base64
	       Base64 compressed fingerprint

   crc
       CRC (Cyclic Redundancy Check) testing format.

       This muxer computes and prints the Adler-32 CRC of all the input	audio
       and video frames. By default audio frames are converted to signed
       16-bit raw audio	and video frames to raw	video before computing the
       CRC.

       The output of the muxer consists	of a single line of the	form:
       CRC=0xCRC, where	CRC is a hexadecimal number 0-padded to	8 digits
       containing the CRC for all the decoded input frames.

       See also	the framecrc muxer.

       Examples

       For example to compute the CRC of the input, and	store it in the	file
       out.crc:

	       ffmpeg -i INPUT -f crc out.crc

       You can print the CRC to	stdout with the	command:

	       ffmpeg -i INPUT -f crc -

       You can select the output format	of each	frame with ffmpeg by
       specifying the audio and	video codec and	format.	For example to compute
       the CRC of the input audio converted to PCM unsigned 8-bit and the
       input video converted to	MPEG-2 video, use the command:

	       ffmpeg -i INPUT -c:a pcm_u8 -c:v	mpeg2video -f crc -

   flv
       Adobe Flash Video Format	muxer.

       This muxer accepts the following	options:

       flvflags	flags
	   Possible values:

	   aac_seq_header_detect
	       Place AAC sequence header based on audio	stream data.

	   no_sequence_end
	       Disable sequence	end tag.

	   no_metadata
	       Disable metadata	tag.

	   no_duration_filesize
	       Disable duration	and filesize in	metadata when they are equal
	       to zero at the end of stream. (Be used to non-seekable living
	       stream).

	   add_keyframe_index
	       Used to facilitate seeking; particularly	for HTTP pseudo
	       streaming.

   framecrc
       Per-packet CRC (Cyclic Redundancy Check)	testing	format.

       This muxer computes and prints the Adler-32 CRC for each	audio and
       video packet. By	default	audio frames are converted to signed 16-bit
       raw audio and video frames to raw video before computing	the CRC.

       The output of the muxer consists	of a line for each audio and video
       packet of the form:

	       <stream_index>, <packet_dts>, <packet_pts>, <packet_duration>, <packet_size>, 0x<CRC>

       CRC is a	hexadecimal number 0-padded to 8 digits	containing the CRC of
       the packet.

       Examples

       For example to compute the CRC of the audio and video frames in INPUT,
       converted to raw	audio and video	packets, and store it in the file
       out.crc:

	       ffmpeg -i INPUT -f framecrc out.crc

       To print	the information	to stdout, use the command:

	       ffmpeg -i INPUT -f framecrc -

       With ffmpeg, you	can select the output format to	which the audio	and
       video frames are	encoded	before computing the CRC for each packet by
       specifying the audio and	video codec. For example, to compute the CRC
       of each decoded input audio frame converted to PCM unsigned 8-bit and
       of each decoded input video frame converted to MPEG-2 video, use	the
       command:

	       ffmpeg -i INPUT -c:a pcm_u8 -c:v	mpeg2video -f framecrc -

       See also	the crc	muxer.

   framehash
       Per-packet hash testing format.

       This muxer computes and prints a	cryptographic hash for each audio and
       video packet. This can be used for packet-by-packet equality checks
       without having to individually do a binary comparison on	each.

       By default audio	frames are converted to	signed 16-bit raw audio	and
       video frames to raw video before	computing the hash, but	the output of
       explicit	conversions to other codecs can	also be	used. It uses the
       SHA-256 cryptographic hash function by default, but supports several
       other algorithms.

       The output of the muxer consists	of a line for each audio and video
       packet of the form:

	       <stream_index>, <packet_dts>, <packet_pts>, <packet_duration>, <packet_size>, <hash>

       hash is a hexadecimal number representing the computed hash for the
       packet.

       hash algorithm
	   Use the cryptographic hash function specified by the	string
	   algorithm.  Supported values	include	"MD5", "murmur3", "RIPEMD128",
	   "RIPEMD160",	"RIPEMD256", "RIPEMD320", "SHA160", "SHA224", "SHA256"
	   (default), "SHA512/224", "SHA512/256", "SHA384", "SHA512", "CRC32"
	   and "adler32".

       Examples

       To compute the SHA-256 hash of the audio	and video frames in INPUT,
       converted to raw	audio and video	packets, and store it in the file
       out.sha256:

	       ffmpeg -i INPUT -f framehash out.sha256

       To print	the information	to stdout, using the MD5 hash function,	use
       the command:

	       ffmpeg -i INPUT -f framehash -hash md5 -

       See also	the hash muxer.

   framemd5
       Per-packet MD5 testing format.

       This is a variant of the	framehash muxer. Unlike	that muxer, it
       defaults	to using the MD5 hash function.

       Examples

       To compute the MD5 hash of the audio and	video frames in	INPUT,
       converted to raw	audio and video	packets, and store it in the file
       out.md5:

	       ffmpeg -i INPUT -f framemd5 out.md5

       To print	the information	to stdout, use the command:

	       ffmpeg -i INPUT -f framemd5 -

       See also	the framehash and md5 muxers.

   gif
       Animated	GIF muxer.

       It accepts the following	options:

       loop
	   Set the number of times to loop the output. Use "-1"	for no loop, 0
	   for looping indefinitely (default).

       final_delay
	   Force the delay (expressed in centiseconds) after the last frame.
	   Each	frame ends with	a delay	until the next frame. The default is
	   "-1", which is a special value to tell the muxer to re-use the
	   previous delay. In case of a	loop, you might	want to	customize this
	   value to mark a pause for instance.

       For example, to encode a	gif looping 10 times, with a 5 seconds delay
       between the loops:

	       ffmpeg -i INPUT -loop 10	-final_delay 500 out.gif

       Note 1: if you wish to extract the frames into separate GIF files, you
       need to force the image2	muxer:

	       ffmpeg -i INPUT -c:v gif	-f image2 "out%d.gif"

       Note 2: the GIF format has a very large time base: the delay between
       two frames can therefore	not be smaller than one	centi second.

   hash
       Hash testing format.

       This muxer computes and prints a	cryptographic hash of all the input
       audio and video frames. This can	be used	for equality checks without
       having to do a complete binary comparison.

       By default audio	frames are converted to	signed 16-bit raw audio	and
       video frames to raw video before	computing the hash, but	the output of
       explicit	conversions to other codecs can	also be	used. Timestamps are
       ignored.	It uses	the SHA-256 cryptographic hash function	by default,
       but supports several other algorithms.

       The output of the muxer consists	of a single line of the	form:
       algo=hash, where	algo is	a short	string representing the	hash function
       used, and hash is a hexadecimal number representing the computed	hash.

       hash algorithm
	   Use the cryptographic hash function specified by the	string
	   algorithm.  Supported values	include	"MD5", "murmur3", "RIPEMD128",
	   "RIPEMD160",	"RIPEMD256", "RIPEMD320", "SHA160", "SHA224", "SHA256"
	   (default), "SHA512/224", "SHA512/256", "SHA384", "SHA512", "CRC32"
	   and "adler32".

       Examples

       To compute the SHA-256 hash of the input	converted to raw audio and
       video, and store	it in the file out.sha256:

	       ffmpeg -i INPUT -f hash out.sha256

       To print	an MD5 hash to stdout use the command:

	       ffmpeg -i INPUT -f hash -hash md5 -

       See also	the framehash muxer.

   hls
       Apple HTTP Live Streaming muxer that segments MPEG-TS according to the
       HTTP Live Streaming (HLS) specification.

       It creates a playlist file, and one or more segment files. The output
       filename	specifies the playlist filename.

       By default, the muxer creates a file for	each segment produced. These
       files have the same name	as the playlist, followed by a sequential
       number and a .ts	extension.

       For example, to convert an input	file with ffmpeg:

	       ffmpeg -i in.nut	out.m3u8

       This example will produce the playlist, out.m3u8, and segment files:
       out0.ts,	out1.ts, out2.ts, etc.

       See also	the segment muxer, which provides a more generic and flexible
       implementation of a segmenter, and can be used to perform HLS
       segmentation.

       Options

       This muxer supports the following options:

       hls_init_time seconds
	   Set the initial target segment length in seconds. Default value is
	   0.  Segment will be cut on the next key frame after this time has
	   passed on the first m3u8 list.  After the initial playlist is
	   filled ffmpeg will cut segments at duration equal to	"hls_time"

       hls_time	seconds
	   Set the target segment length in seconds. Default value is 2.
	   Segment will	be cut on the next key frame after this	time has
	   passed.

       hls_list_size size
	   Set the maximum number of playlist entries. If set to 0 the list
	   file	will contain all the segments. Default value is	5.

       hls_ts_options options_list
	   Set output format options using a :-separated list of key=value
	   parameters. Values containing ":" special characters	must be
	   escaped.

       hls_wrap	wrap
	   This	is a deprecated	option,	you can	use "hls_list_size" and
	   "hls_flags delete_segments" instead it

	   This	option is useful to avoid to fill the disk with	many segment
	   files, and limits the maximum number	of segment files written to
	   disk	to wrap.

       hls_start_number_source
	   Start the playlist sequence number ("#EXT-X-MEDIA-SEQUENCE")
	   according to	the specified source.  Unless "hls_flags single_file"
	   is set, it also specifies source of starting	sequence numbers of
	   segment and subtitle	filenames. In any case,	if "hls_flags
	   append_list"	is set and read	playlist sequence number is greater
	   than	the specified start sequence number, then that value will be
	   used	as start value.

	   It accepts the following values:

	   generic (default)
	       Set the starting	sequence numbers according to start_number
	       option value.

	   epoch
	       The start number	will be	the seconds since epoch	(1970-01-01
	       00:00:00)

	   datetime
	       The start number	will be	based on the current date/time as
	       YYYYmmddHHMMSS. e.g. 20161231235759.

       start_number number
	   Start the playlist sequence number ("#EXT-X-MEDIA-SEQUENCE")	from
	   the specified number	when hls_start_number_source value is generic.
	   (This is the	default	case.)	Unless "hls_flags single_file" is set,
	   it also specifies starting sequence numbers of segment and subtitle
	   filenames.  Default value is	0.

       hls_allow_cache allowcache
	   Explicitly set whether the client MAY \fIs0(1) or MUST NOT \fIs0(0)
	   cache media segments.

       hls_base_url baseurl
	   Append baseurl to every entry in the	playlist.  Useful to generate
	   playlists with absolute paths.

	   Note	that the playlist sequence number must be unique for each
	   segment and it is not to be confused	with the segment filename
	   sequence number which can be	cyclic,	for example if the wrap	option
	   is specified.

       hls_segment_filename filename
	   Set the segment filename. Unless "hls_flags single_file" is set,
	   filename is used as a string	format with the	segment	number:

		   ffmpeg -i in.nut -hls_segment_filename 'file%03d.ts'	out.m3u8

	   This	example	will produce the playlist, out.m3u8, and segment
	   files: file000.ts, file001.ts, file002.ts, etc.

	   filename may	contain	full path or relative path specification, but
	   only	the file name part without any path info will be contained in
	   the m3u8 segment list.  Should a relative path be specified,	the
	   path	of the created segment files will be relative to the current
	   working directory.  When use_localtime_mkdir	is set,	the whole
	   expanded value of filename will be written into the m3u8 segment
	   list.

       use_localtime
	   Use strftime() on filename to expand	the segment filename with
	   localtime.  The segment number is also available in this mode, but
	   to use it, you need to specify second_level_segment_index hls_flag
	   and %%d will	be the specifier.

		   ffmpeg -i in.nut -use_localtime 1 -hls_segment_filename 'file-%Y%m%d-%s.ts' out.m3u8

	   This	example	will produce the playlist, out.m3u8, and segment
	   files: file-20160215-1455569023.ts, file-20160215-1455569024.ts,
	   etc.	 Note: On some systems/environments, the %s specifier is not
	   available. See
	     "strftime()" documentation.

		   ffmpeg -i in.nut -use_localtime 1 -hls_flags	second_level_segment_index -hls_segment_filename 'file-%Y%m%d-%%04d.ts'	out.m3u8

	   This	example	will produce the playlist, out.m3u8, and segment
	   files: file-20160215-0001.ts, file-20160215-0002.ts,	etc.

       use_localtime_mkdir
	   Used	together with -use_localtime, it will create all
	   subdirectories which	is expanded in filename.

		   ffmpeg -i in.nut -use_localtime 1 -use_localtime_mkdir 1 -hls_segment_filename '%Y%m%d/file-%Y%m%d-%s.ts' out.m3u8

	   This	example	will create a directory	201560215 (if it does not
	   exist), and then produce the	playlist, out.m3u8, and	segment	files:
	   20160215/file-20160215-1455569023.ts,
	   20160215/file-20160215-1455569024.ts, etc.

		   ffmpeg -i in.nut -use_localtime 1 -use_localtime_mkdir 1 -hls_segment_filename '%Y/%m/%d/file-%Y%m%d-%s.ts' out.m3u8

	   This	example	will create a directory	hierarchy 2016/02/15 (if any
	   of them do not exist), and then produce the playlist, out.m3u8, and
	   segment files: 2016/02/15/file-20160215-1455569023.ts,
	   2016/02/15/file-20160215-1455569024.ts, etc.

       hls_key_info_file key_info_file
	   Use the information in key_info_file	for segment encryption.	The
	   first line of key_info_file specifies the key URI written to	the
	   playlist. The key URL is used to access the encryption key during
	   playback. The second	line specifies the path	to the key file	used
	   to obtain the key during the	encryption process. The	key file is
	   read	as a single packed array of 16 octets in binary	format.	The
	   optional third line specifies the initialization vector (IV)	as a
	   hexadecimal string to be used instead of the	segment	sequence
	   number (default) for	encryption. Changes to key_info_file will
	   result in segment encryption	with the new key/IV and	an entry in
	   the playlist	for the	new key	URI/IV.

	   Key info file format:

		   <key	URI>
		   <key	file path>
		   <IV>	(optional)

	   Example key URIs:

		   http://server/file.key
		   /path/to/file.key
		   file.key

	   Example key file paths:

		   file.key
		   /path/to/file.key

	   Example IV:

		   0123456789ABCDEF0123456789ABCDEF

	   Key info file example:

		   http://server/file.key
		   /path/to/file.key
		   0123456789ABCDEF0123456789ABCDEF

	   Example shell script:

		   #!/bin/sh
		   BASE_URL=${1:-'.'}
		   openssl rand	16 > file.key
		   echo	$BASE_URL/file.key > file.keyinfo
		   echo	file.key >> file.keyinfo
		   echo	$(openssl rand -hex 16)	>> file.keyinfo
		   ffmpeg -f lavfi -re -i testsrc -c:v h264 -hls_flags delete_segments \
		     -hls_key_info_file	file.keyinfo out.m3u8

       hls_flags flags
	   Possible values:

	   single_file
	       If this flag is set, the	muxer will store all segments in a
	       single MPEG-TS file, and	will use byte ranges in	the playlist.
	       HLS playlists generated with this way will have the version
	       number 4.  For example:

		       ffmpeg -i in.nut	-hls_flags single_file out.m3u8

	       Will produce the	playlist, out.m3u8, and	a single segment file,
	       out.ts.

	   delete_segments
	       Segment files removed from the playlist are deleted after a
	       period of time equal to the duration of the segment plus	the
	       duration	of the playlist.

	   append_list
	       Append new segments into	the end	of old segment list, and
	       remove the "#EXT-X-ENDLIST" from	the old	segment	list.

	   round_durations
	       Round the duration info in the playlist file segment info to
	       integer values, instead of using	floating point.

	   discont_start
	       Add the "#EXT-X-DISCONTINUITY" tag to the playlist, before the
	       first segment's information.

	   omit_endlist
	       Do not append the "EXT-X-ENDLIST" tag at	the end	of the
	       playlist.

	   split_by_time
	       Allow segments to start on frames other than keyframes. This
	       improves	behavior on some players when the time between
	       keyframes is inconsistent, but may make things worse on others,
	       and can cause some oddities during seeking. This	flag should be
	       used with the "hls_time"	option.

	   program_date_time
	       Generate	"EXT-X-PROGRAM-DATE-TIME" tags.

	   second_level_segment_index
	       Makes it	possible to use	segment	indexes	as %%d in
	       hls_segment_filename expression besides date/time values	when
	       use_localtime is	on.  To	get fixed width	numbers	with trailing
	       zeroes, %%0xd format is available where x is the	required
	       width.

	   second_level_segment_size
	       Makes it	possible to use	segment	sizes (counted in bytes) as
	       %%s in hls_segment_filename expression besides date/time	values
	       when use_localtime is on.  To get fixed width numbers with
	       trailing	zeroes,	%%0xs format is	available where	x is the
	       required	width.

	   second_level_segment_duration
	       Makes it	possible to use	segment	duration (calculated  in
	       microseconds) as	%%t in hls_segment_filename expression besides
	       date/time values	when use_localtime is on.  To get fixed	width
	       numbers with trailing zeroes, %%0xt format is available where x
	       is the required width.

		       ffmpeg -i sample.mpeg \
			  -f hls -hls_time 3 -hls_list_size 5 \
			  -hls_flags second_level_segment_index+second_level_segment_size+second_level_segment_duration	\
			  -use_localtime 1 -use_localtime_mkdir	1 -hls_segment_filename	"segment_%Y%m%d%H%M%S_%%04d_%%08s_%%013t.ts" stream.m3u8

	       This will produce segments like this:
	       segment_20170102194334_0003_00122200_0000003000000.ts,
	       segment_20170102194334_0004_00120072_0000003000000.ts etc.

	   temp_file
	       Write segment data to filename.tmp and rename to	filename only
	       once the	segment	is complete. A webserver serving up segments
	       can be configured to reject requests to *.tmp to	prevent	access
	       to in-progress segments before they have	been added to the m3u8
	       playlist.

       hls_playlist_type event
	   Emit	"#EXT-X-PLAYLIST-TYPE:EVENT" in	the m3u8 header. Forces
	   hls_list_size to 0; the playlist can	only be	appended to.

       hls_playlist_type vod
	   Emit	"#EXT-X-PLAYLIST-TYPE:VOD" in the m3u8 header. Forces
	   hls_list_size to 0; the playlist must not change.

       method
	   Use the given HTTP method to	create the hls files.

		   ffmpeg -re -i in.ts -f hls -method PUT http://example.com/live/out.m3u8

	   This	example	will upload all	the mpegts segment files to the	HTTP
	   server using	the HTTP PUT method, and update	the m3u8 files every
	   "refresh" times using the same method.  Note	that the HTTP server
	   must	support	the given method for uploading files.

   ico
       ICO file	muxer.

       Microsoft's icon	file format (ICO) has some strict limitations that
       should be noted:

       o   Size	cannot exceed 256 pixels in any	dimension

       o   Only	BMP and	PNG images can be stored

       o   If a	BMP image is used, it must be one of the following pixel
	   formats:

		   BMP Bit Depth      FFmpeg Pixel Format
		   1bit		      pal8
		   4bit		      pal8
		   8bit		      pal8
		   16bit	      rgb555le
		   24bit	      bgr24
		   32bit	      bgra

       o   If a	BMP image is used, it must use the BITMAPINFOHEADER DIB	header

       o   If a	PNG image is used, it must use the rgba	pixel format

   image2
       Image file muxer.

       The image file muxer writes video frames	to image files.

       The output filenames are	specified by a pattern,	which can be used to
       produce sequentially numbered series of files.  The pattern may contain
       the string "%d" or "%0Nd", this string specifies	the position of	the
       characters representing a numbering in the filenames. If	the form
       "%0Nd" is used, the string representing the number in each filename is
       0-padded	to N digits. The literal character '%' can be specified	in the
       pattern with the	string "%%".

       If the pattern contains "%d" or "%0Nd", the first filename of the file
       list specified will contain the number 1, all the following numbers
       will be sequential.

       The pattern may contain a suffix	which is used to automatically
       determine the format of the image files to write.

       For example the pattern "img-%03d.bmp" will specify a sequence of
       filenames of the	form img-001.bmp, img-002.bmp, ..., img-010.bmp, etc.
       The pattern "img%%-%d.jpg" will specify a sequence of filenames of the
       form img%-1.jpg,	img%-2.jpg, ..., img%-10.jpg, etc.

       Examples

       The following example shows how to use ffmpeg for creating a sequence
       of files	img-001.jpeg, img-002.jpeg, ..., taking	one image every	second
       from the	input video:

	       ffmpeg -i in.avi	-vsync cfr -r 1	-f image2 'img-%03d.jpeg'

       Note that with ffmpeg, if the format is not specified with the "-f"
       option and the output filename specifies	an image file format, the
       image2 muxer is automatically selected, so the previous command can be
       written as:

	       ffmpeg -i in.avi	-vsync cfr -r 1	'img-%03d.jpeg'

       Note also that the pattern must not necessarily contain "%d" or "%0Nd",
       for example to create a single image file img.jpeg from the start of
       the input video you can employ the command:

	       ffmpeg -i in.avi	-f image2 -frames:v 1 img.jpeg

       The strftime option allows you to expand	the filename with date and
       time information. Check the documentation of the	"strftime()" function
       for the syntax.

       For example to generate image files from	the "strftime()"
       "%Y-%m-%d_%H-%M-%S" pattern, the	following ffmpeg command can be	used:

	       ffmpeg -f v4l2 -r 1 -i /dev/video0 -f image2 -strftime 1	"%Y-%m-%d_%H-%M-%S.jpg"

       Options

       start_number
	   Start the sequence from the specified number. Default value is 0.

       update
	   If set to 1,	the filename will always be interpreted	as just	a
	   filename, not a pattern, and	the corresponding file will be
	   continuously	overwritten with new images. Default value is 0.

       strftime
	   If set to 1,	expand the filename with date and time information
	   from	"strftime()". Default value is 0.

       The image muxer supports	the .Y.U.V image file format. This format is
       special in that that each image frame consists of three files, for each
       of the YUV420P components. To read or write this	image file format,
       specify the name	of the '.Y' file. The muxer will automatically open
       the '.U'	and '.V' files as required.

   matroska
       Matroska	container muxer.

       This muxer implements the matroska and webm container specs.

       Metadata

       The recognized metadata settings	in this	muxer are:

       title
	   Set title name provided to a	single track.

       language
	   Specify the language	of the track in	the Matroska languages form.

	   The language	can be either the 3 letters bibliographic ISO-639-2
	   (ISO	639-2/B) form (like "fre" for French), or a language code
	   mixed with a	country	code for specialities in languages (like "fre-
	   ca" for Canadian French).

       stereo_mode
	   Set stereo 3D video layout of two views in a	single video track.

	   The following values	are recognized:

	   mono
	       video is	not stereo

	   left_right
	       Both views are arranged side by side, Left-eye view is on the
	       left

	   bottom_top
	       Both views are arranged in top-bottom orientation, Left-eye
	       view is at bottom

	   top_bottom
	       Both views are arranged in top-bottom orientation, Left-eye
	       view is on top

	   checkerboard_rl
	       Each view is arranged in	a checkerboard interleaved pattern,
	       Left-eye	view being first

	   checkerboard_lr
	       Each view is arranged in	a checkerboard interleaved pattern,
	       Right-eye view being first

	   row_interleaved_rl
	       Each view is constituted	by a row based interleaving, Right-eye
	       view is first row

	   row_interleaved_lr
	       Each view is constituted	by a row based interleaving, Left-eye
	       view is first row

	   col_interleaved_rl
	       Both views are arranged in a column based interleaving manner,
	       Right-eye view is first column

	   col_interleaved_lr
	       Both views are arranged in a column based interleaving manner,
	       Left-eye	view is	first column

	   anaglyph_cyan_red
	       All frames are in anaglyph format viewable through red-cyan
	       filters

	   right_left
	       Both views are arranged side by side, Right-eye view is on the
	       left

	   anaglyph_green_magenta
	       All frames are in anaglyph format viewable through green-
	       magenta filters

	   block_lr
	       Both eyes laced in one Block, Left-eye view is first

	   block_rl
	       Both eyes laced in one Block, Right-eye view is first

       For example a 3D	WebM clip can be created using the following command
       line:

	       ffmpeg -i sample_left_right_clip.mpg -an	-c:v libvpx -metadata stereo_mode=left_right -y	stereo_clip.webm

       Options

       This muxer supports the following options:

       reserve_index_space
	   By default, this muxer writes the index for seeking (called cues in
	   Matroska terms) at the end of the file, because it cannot know in
	   advance how much space to leave for the index at the	beginning of
	   the file. However for some use cases	-- e.g.	 streaming where
	   seeking is possible but slow	-- it is useful	to put the index at
	   the beginning of the	file.

	   If this option is set to a non-zero value, the muxer	will reserve a
	   given amount	of space in the	file header and	then try to write the
	   cues	there when the muxing finishes.	If the available space does
	   not suffice,	muxing will fail. A safe size for most use cases
	   should be about 50kB	per hour of video.

	   Note	that cues are only written if the output is seekable and this
	   option will have no effect if it is not.

   md5
       MD5 testing format.

       This is a variant of the	hash muxer. Unlike that	muxer, it defaults to
       using the MD5 hash function.

       Examples

       To compute the MD5 hash of the input converted to raw audio and video,
       and store it in the file	out.md5:

	       ffmpeg -i INPUT -f md5 out.md5

       You can print the MD5 to	stdout with the	command:

	       ffmpeg -i INPUT -f md5 -

       See also	the hash and framemd5 muxers.

   mov,	mp4, ismv
       MOV/MP4/ISMV (Smooth Streaming) muxer.

       The mov/mp4/ismv	muxer supports fragmentation. Normally,	a MOV/MP4 file
       has all the metadata about all packets stored in	one location (written
       at the end of the file, it can be moved to the start for	better
       playback	by adding faststart to the movflags, or	using the qt-faststart
       tool). A	fragmented file	consists of a number of	fragments, where
       packets and metadata about these	packets	are stored together. Writing a
       fragmented file has the advantage that the file is decodable even if
       the writing is interrupted (while a normal MOV/MP4 is undecodable if it
       is not properly finished), and it requires less memory when writing
       very long files (since writing normal MOV/MP4 files stores info about
       every single packet in memory until the file is closed).	The downside
       is that it is less compatible with other	applications.

       Options

       Fragmentation is	enabled	by setting one of the AVOptions	that define
       how to cut the file into	fragments:

       -moov_size bytes
	   Reserves space for the moov atom at the beginning of	the file
	   instead of placing the moov atom at the end.	If the space reserved
	   is insufficient, muxing will	fail.

       -movflags frag_keyframe
	   Start a new fragment	at each	video keyframe.

       -frag_duration duration
	   Create fragments that are duration microseconds long.

       -frag_size size
	   Create fragments that contain up to size bytes of payload data.

       -movflags frag_custom
	   Allow the caller to manually	choose when to cut fragments, by
	   calling "av_write_frame(ctx,	NULL)" to write	a fragment with	the
	   packets written so far. (This is only useful	with other
	   applications	integrating libavformat, not from ffmpeg.)

       -min_frag_duration duration
	   Don't create	fragments that are shorter than	duration microseconds
	   long.

       If more than one	condition is specified,	fragments are cut when one of
       the specified conditions	is fulfilled. The exception to this is
       "-min_frag_duration", which has to be fulfilled for any of the other
       conditions to apply.

       Additionally, the way the output	file is	written	can be adjusted
       through a few other options:

       -movflags empty_moov
	   Write an initial moov atom directly at the start of the file,
	   without describing any samples in it. Generally, an mdat/moov pair
	   is written at the start of the file,	as a normal MOV/MP4 file,
	   containing only a short portion of the file.	With this option set,
	   there is no initial mdat atom, and the moov atom only describes the
	   tracks but has a zero duration.

	   This	option is implicitly set when writing ismv (Smooth Streaming)
	   files.

       -movflags separate_moof
	   Write a separate moof (movie	fragment) atom for each	track.
	   Normally, packets for all tracks are	written	in a moof atom (which
	   is slightly more efficient),	but with this option set, the muxer
	   writes one moof/mdat	pair for each track, making it easier to
	   separate tracks.

	   This	option is implicitly set when writing ismv (Smooth Streaming)
	   files.

       -movflags faststart
	   Run a second	pass moving the	index (moov atom) to the beginning of
	   the file.  This operation can take a	while, and will	not work in
	   various situations such as fragmented output, thus it is not
	   enabled by default.

       -movflags rtphint
	   Add RTP hinting tracks to the output	file.

       -movflags disable_chpl
	   Disable Nero	chapter	markers	(chpl atom).  Normally,	both Nero
	   chapters and	a QuickTime chapter track are written to the file.
	   With	this option set, only the QuickTime chapter track will be
	   written. Nero chapters can cause failures when the file is
	   reprocessed with certain tagging programs, like mp3Tag 2.61a	and
	   iTunes 11.3,	most likely other versions are affected	as well.

       -movflags omit_tfhd_offset
	   Do not write	any absolute base_data_offset in tfhd atoms. This
	   avoids tying	fragments to absolute byte positions in	the
	   file/streams.

       -movflags default_base_moof
	   Similarly to	the omit_tfhd_offset, this flag	avoids writing the
	   absolute base_data_offset field in tfhd atoms, but does so by using
	   the new default-base-is-moof	flag instead. This flag	is new from
	   14496-12:2012. This may make	the fragments easier to	parse in
	   certain circumstances (avoiding basing track	fragment location
	   calculations	on the implicit	end of the previous track fragment).

       -write_tmcd
	   Specify "on"	to force writing a timecode track, "off" to disable it
	   and "auto" to write a timecode track	only for mov and mp4 output
	   (default).

       Example

       Smooth Streaming	content	can be pushed in real time to a	publishing
       point on	IIS with this muxer. Example:

	       ffmpeg -re <<normal input/transcoding options>> -movflags isml+frag_keyframe -f ismv http://server/publishingpoint.isml/Streams(Encoder1)

       Audible AAX

       Audible AAX files are encrypted M4B files, and they can be decrypted by
       specifying a 4 byte activation secret.

	       ffmpeg -activation_bytes	1CEB00DA -i test.aax -vn -c:a copy output.mp4

   mp3
       The MP3 muxer writes a raw MP3 stream with the following	optional
       features:

       o   An ID3v2 metadata header at the beginning (enabled by default).
	   Versions 2.3	and 2.4	are supported, the "id3v2_version" private
	   option controls which one is	used (3	or 4). Setting "id3v2_version"
	   to 0	disables the ID3v2 header completely.

	   The muxer supports writing attached pictures	(APIC frames) to the
	   ID3v2 header.  The pictures are supplied to the muxer in form of a
	   video stream	with a single packet. There can	be any number of those
	   streams, each will correspond to a single APIC frame.  The stream
	   metadata tags title and comment map to APIC description and picture
	   type	respectively. See <http://id3.org/id3v2.4.0-frames> for
	   allowed picture types.

	   Note	that the APIC frames must be written at	the beginning, so the
	   muxer will buffer the audio frames until it gets all	the pictures.
	   It is therefore advised to provide the pictures as soon as possible
	   to avoid excessive buffering.

       o   A Xing/LAME frame right after the ID3v2 header (if present).	It is
	   enabled by default, but will	be written only	if the output is
	   seekable. The "write_xing" private option can be used to disable
	   it.	The frame contains various information that may	be useful to
	   the decoder,	like the audio duration	or encoder delay.

       o   A legacy ID3v1 tag at the end of the	file (disabled by default). It
	   may be enabled with the "write_id3v1" private option, but as	its
	   capabilities	are very limited, its usage is not recommended.

       Examples:

       Write an	mp3 with an ID3v2.3 header and an ID3v1	footer:

	       ffmpeg -i INPUT -id3v2_version 3	-write_id3v1 1 out.mp3

       To attach a picture to an mp3 file select both the audio	and the
       picture stream with "map":

	       ffmpeg -i input.mp3 -i cover.png	-c copy	-map 0 -map 1
	       -metadata:s:v title="Album cover" -metadata:s:v comment="Cover (Front)" out.mp3

       Write a "clean" MP3 without any extra features:

	       ffmpeg -i input.wav -write_xing 0 -id3v2_version	0 out.mp3

   mpegts
       MPEG transport stream muxer.

       This muxer implements ISO 13818-1 and part of ETSI EN 300 468.

       The recognized metadata settings	in mpegts muxer	are "service_provider"
       and "service_name". If they are not set the default for
       "service_provider" is FFmpeg and	the default for	"service_name" is
       Service01.

       Options

       The muxer options are:

       mpegts_transport_stream_id integer
	   Set the transport_stream_id.	This identifies	a transponder in DVB.
	   Default is 0x0001.

       mpegts_original_network_id integer
	   Set the original_network_id.	This is	unique identifier of a network
	   in DVB. Its main use	is in the unique identification	of a service
	   through the path Original_Network_ID, Transport_Stream_ID. Default
	   is 0x0001.

       mpegts_service_id integer
	   Set the service_id, also known as program in	DVB. Default is
	   0x0001.

       mpegts_service_type integer
	   Set the program service_type. Default is "digital_tv".  Accepts the
	   following options:

	   hex_value
	       Any hexdecimal value between 0x01 to 0xff as defined in ETSI
	       300 468.

	   digital_tv
	       Digital TV service.

	   digital_radio
	       Digital Radio service.

	   teletext
	       Teletext	service.

	   advanced_codec_digital_radio
	       Advanced	Codec Digital Radio service.

	   mpeg2_digital_hdtv
	       MPEG2 Digital HDTV service.

	   advanced_codec_digital_sdtv
	       Advanced	Codec Digital SDTV service.

	   advanced_codec_digital_hdtv
	       Advanced	Codec Digital HDTV service.

       mpegts_pmt_start_pid integer
	   Set the first PID for PMT. Default is 0x1000. Max is	0x1f00.

       mpegts_start_pid	integer
	   Set the first PID for data packets. Default is 0x0100. Max is
	   0x0f00.

       mpegts_m2ts_mode	boolean
	   Enable m2ts mode if set to 1. Default value is "-1" which disables
	   m2ts	mode.

       muxrate integer
	   Set a constant muxrate. Default is VBR.

       pes_payload_size	integer
	   Set minimum PES packet payload in bytes. Default is 2930.

       mpegts_flags flags
	   Set mpegts flags. Accepts the following options:

	   resend_headers
	       Reemit PAT/PMT before writing the next packet.

	   latm
	       Use LATM	packetization for AAC.

	   pat_pmt_at_frames
	       Reemit PAT and PMT at each video	frame.

	   system_b
	       Conform to System B (DVB) instead of System A (ATSC).

	   initial_discontinuity
	       Mark the	initial	packet of each stream as discontinuity.

       resend_headers integer
	   Reemit PAT/PMT before writing the next packet. This option is
	   deprecated: use mpegts_flags	instead.

       mpegts_copyts boolean
	   Preserve original timestamps, if value is set to 1. Default value
	   is "-1", which results in shifting timestamps so that they start
	   from	0.

       omit_video_pes_length boolean
	   Omit	the PES	packet length for video	packets. Default is 1 (true).

       pcr_period integer
	   Override the	default	PCR retransmission time	in milliseconds.
	   Ignored if variable muxrate is selected. Default is 20.

       pat_period double
	   Maximum time	in seconds between PAT/PMT tables.

       sdt_period double
	   Maximum time	in seconds between SDT tables.

       tables_version integer
	   Set PAT, PMT	and SDT	version	(default 0, valid values are from 0 to
	   31, inclusively).  This option allows updating stream structure so
	   that	standard consumer may detect the change. To do so, reopen
	   output "AVFormatContext" (in	case of	API usage) or restart ffmpeg
	   instance, cyclically	changing tables_version	value:

		   ffmpeg -i source1.ts	-codec copy -f mpegts -tables_version 0	udp://1.1.1.1:1111
		   ffmpeg -i source2.ts	-codec copy -f mpegts -tables_version 1	udp://1.1.1.1:1111
		   ...
		   ffmpeg -i source3.ts	-codec copy -f mpegts -tables_version 31 udp://1.1.1.1:1111
		   ffmpeg -i source1.ts	-codec copy -f mpegts -tables_version 0	udp://1.1.1.1:1111
		   ffmpeg -i source2.ts	-codec copy -f mpegts -tables_version 1	udp://1.1.1.1:1111
		   ...

       Example

	       ffmpeg -i file.mpg -c copy \
		    -mpegts_original_network_id	0x1122 \
		    -mpegts_transport_stream_id	0x3344 \
		    -mpegts_service_id 0x5566 \
		    -mpegts_pmt_start_pid 0x1500 \
		    -mpegts_start_pid 0x150 \
		    -metadata service_provider="Some provider" \
		    -metadata service_name="Some Channel" \
		    out.ts

   mxf,	mxf_d10
       MXF muxer.

       Options

       The muxer options are:

       store_user_comments bool
	   Set if user comments	should be stored if available or never.	 IRT
	   D-10	does not allow user comments. The default is thus to write
	   them	for mxf	but not	for mxf_d10

   null
       Null muxer.

       This muxer does not generate any	output file, it	is mainly useful for
       testing or benchmarking purposes.

       For example to benchmark	decoding with ffmpeg you can use the command:

	       ffmpeg -benchmark -i INPUT -f null out.null

       Note that the above command does	not read or write the out.null file,
       but specifying the output file is required by the ffmpeg	syntax.

       Alternatively you can write the command as:

	       ffmpeg -benchmark -i INPUT -f null -

   nut
       -syncpoints flags
	   Change the syncpoint	usage in nut:

	   default use the normal low-overhead seeking aids.
	   none	do not use the syncpoints at all, reducing the overhead	but
	   making the stream non-seekable;
		   Use of this option is not recommended, as the resulting files are very damage
		   sensitive and seeking is not	possible. Also in general the overhead from
		   syncpoints is negligible. Note, -C<write_index> 0 can be used to disable
		   all growing data tables, allowing to	mux endless streams with limited memory
		   and without these disadvantages.

	   timestamped extend the syncpoint with a wallclock field.

	   The none and	timestamped flags are experimental.

       -write_index bool
	   Write index at the end, the default is to write an index.

	       ffmpeg -i INPUT -f_strict experimental -syncpoints none - | processor

   ogg
       Ogg container muxer.

       -page_duration duration
	   Preferred page duration, in microseconds. The muxer will attempt to
	   create pages	that are approximately duration	microseconds long.
	   This	allows the user	to compromise between seek granularity and
	   container overhead. The default is 1	second.	A value	of 0 will fill
	   all segments, making	pages as large as possible. A value of 1 will
	   effectively use 1 packet-per-page in	most situations, giving	a
	   small seek granularity at the cost of additional container
	   overhead.

       -serial_offset value
	   Serial value	from which to set the streams serial number.  Setting
	   it to different and sufficiently large values ensures that the
	   produced ogg	files can be safely chained.

   segment, stream_segment, ssegment
       Basic stream segmenter.

       This muxer outputs streams to a number of separate files	of nearly
       fixed duration. Output filename pattern can be set in a fashion similar
       to image2, or by	using a	"strftime" template if the strftime option is
       enabled.

       "stream_segment"	is a variant of	the muxer used to write	to streaming
       output formats, i.e. which do not require global	headers, and is
       recommended for outputting e.g. to MPEG transport stream	segments.
       "ssegment" is a shorter alias for "stream_segment".

       Every segment starts with a keyframe of the selected reference stream,
       which is	set through the	reference_stream option.

       Note that if you	want accurate splitting	for a video file, you need to
       make the	input key frames correspond to the exact splitting times
       expected	by the segmenter, or the segment muxer will start the new
       segment with the	key frame found	next after the specified start time.

       The segment muxer works best with a single constant frame rate video.

       Optionally it can generate a list of the	created	segments, by setting
       the option segment_list.	The list type is specified by the
       segment_list_type option. The entry filenames in	the segment list are
       set by default to the basename of the corresponding segment files.

       See also	the hls	muxer, which provides a	more specific implementation
       for HLS segmentation.

       Options

       The segment muxer supports the following	options:

       increment_tc 1|0
	   if set to 1,	increment timecode between each	segment	If this	is
	   selected, the input need to have a timecode in the first video
	   stream. Default value is 0.

       reference_stream	specifier
	   Set the reference stream, as	specified by the string	specifier.  If
	   specifier is	set to "auto", the reference is	chosen automatically.
	   Otherwise it	must be	a stream specifier (see	the ``Stream
	   specifiers''	chapter	in the ffmpeg manual) which specifies the
	   reference stream. The default value is "auto".

       segment_format format
	   Override the	inner container	format,	by default it is guessed by
	   the filename	extension.

       segment_format_options options_list
	   Set output format options using a :-separated list of key=value
	   parameters. Values containing the ":" special character must	be
	   escaped.

       segment_list name
	   Generate also a listfile named name.	If not specified no listfile
	   is generated.

       segment_list_flags flags
	   Set flags affecting the segment list	generation.

	   It currently	supports the following flags:

	   cache
	       Allow caching (only affects M3U8	list files).

	   live
	       Allow live-friendly file	generation.

       segment_list_size size
	   Update the list file	so that	it contains at most size segments. If
	   0 the list file will	contain	all the	segments. Default value	is 0.

       segment_list_entry_prefix prefix
	   Prepend prefix to each entry. Useful	to generate absolute paths.
	   By default no prefix	is applied.

       segment_list_type type
	   Select the listing format.

	   The following values	are recognized:

	   flat
	       Generate	a flat list for	the created segments, one segment per
	       line.

	   csv,	ext
	       Generate	a list for the created segments, one segment per line,
	       each line matching the format (comma-separated values):

		       <segment_filename>,<segment_start_time>,<segment_end_time>

	       segment_filename	is the name of the output file generated by
	       the muxer according to the provided pattern. CSV	escaping
	       (according to RFC4180) is applied if required.

	       segment_start_time and segment_end_time specify the segment
	       start and end time expressed in seconds.

	       A list file with	the suffix ".csv" or ".ext" will auto-select
	       this format.

	       ext is deprecated in favor or csv.

	   ffconcat
	       Generate	an ffconcat file for the created segments. The
	       resulting file can be read using	the FFmpeg concat demuxer.

	       A list file with	the suffix ".ffcat" or ".ffconcat" will	auto-
	       select this format.

	   m3u8
	       Generate	an extended M3U8 file, version 3, compliant with
	       <http://tools.ietf.org/id/draft-pantos-http-live-streaming>.

	       A list file with	the suffix ".m3u8" will	auto-select this
	       format.

	   If not specified the	type is	guessed	from the list file name
	   suffix.

       segment_time time
	   Set segment duration	to time, the value must	be a duration
	   specification. Default value	is "2".	See also the segment_times
	   option.

	   Note	that splitting may not be accurate, unless you force the
	   reference stream key-frames at the given time. See the introductory
	   notice and the examples below.

       segment_atclocktime 1|0
	   If set to "1" split at regular clock	time intervals starting	from
	   00:00 o'clock. The time value specified in segment_time is used for
	   setting the length of the splitting interval.

	   For example with segment_time set to	"900" this makes it possible
	   to create files at 12:00 o'clock, 12:15, 12:30, etc.

	   Default value is "0".

       segment_clocktime_offset	duration
	   Delay the segment splitting times with the specified	duration when
	   using segment_atclocktime.

	   For example with segment_time set to	"900" and
	   segment_clocktime_offset set	to "300" this makes it possible	to
	   create files	at 12:05, 12:20, 12:35,	etc.

	   Default value is "0".

       segment_clocktime_wrap_duration duration
	   Force the segmenter to only start a new segment if a	packet reaches
	   the muxer within the	specified duration after the segmenting	clock
	   time. This way you can make the segmenter more resilient to
	   backward local time jumps, such as leap seconds or transition to
	   standard time from daylight savings time.

	   Default is the maximum possible duration which means	starting a new
	   segment regardless of the elapsed time since	the last clock time.

       segment_time_delta delta
	   Specify the accuracy	time when selecting the	start time for a
	   segment, expressed as a duration specification. Default value is
	   "0".

	   When	delta is specified a key-frame will start a new	segment	if its
	   PTS satisfies the relation:

		   PTS >= start_time - time_delta

	   This	option is useful when splitting	video content, which is	always
	   split at GOP	boundaries, in case a key frame	is found just before
	   the specified split time.

	   In particular may be	used in	combination with the ffmpeg option
	   force_key_frames. The key frame times specified by force_key_frames
	   may not be set accurately because of	rounding issues, with the
	   consequence that a key frame	time may result	set just before	the
	   specified time. For constant	frame rate videos a value of
	   1/(2*frame_rate) should address the worst case mismatch between the
	   specified time and the time set by force_key_frames.

       segment_times times
	   Specify a list of split points. times contains a list of comma
	   separated duration specifications, in increasing order. See also
	   the segment_time option.

       segment_frames frames
	   Specify a list of split video frame numbers.	frames contains	a list
	   of comma separated integer numbers, in increasing order.

	   This	option specifies to start a new	segment	whenever a reference
	   stream key frame is found and the sequential	number (starting from
	   0) of the frame is greater or equal to the next value in the	list.

       segment_wrap limit
	   Wrap	around segment index once it reaches limit.

       segment_start_number number
	   Set the sequence number of the first	segment. Defaults to 0.

       strftime	1|0
	   Use the "strftime" function to define the name of the new segments
	   to write. If	this is	selected, the output segment name must contain
	   a "strftime"	function template. Default value is 0.

       break_non_keyframes 1|0
	   If enabled, allow segments to start on frames other than keyframes.
	   This	improves behavior on some players when the time	between
	   keyframes is	inconsistent, but may make things worse	on others, and
	   can cause some oddities during seeking. Defaults to 0.

       reset_timestamps	1|0
	   Reset timestamps at the begin of each segment, so that each segment
	   will	start with near-zero timestamps. It is meant to	ease the
	   playback of the generated segments. May not work with some
	   combinations	of muxers/codecs. It is	set to 0 by default.

       initial_offset offset
	   Specify timestamp offset to apply to	the output packet timestamps.
	   The argument	must be	a time duration	specification, and defaults to
	   0.

       write_empty_segments 1|0
	   If enabled, write an	empty segment if there are no packets during
	   the period a	segment	would usually span. Otherwise, the segment
	   will	be filled with the next	packet written.	Defaults to 0.

       Examples

       o   Remux the content of	file in.mkv to a list of segments out-000.nut,
	   out-001.nut,	etc., and write	the list of generated segments to
	   out.list:

		   ffmpeg -i in.mkv -codec copy	-map 0 -f segment -segment_list	out.list out%03d.nut

       o   Segment input and set output	format options for the output
	   segments:

		   ffmpeg -i in.mkv -f segment -segment_time 10	-segment_format_options	movflags=+faststart out%03d.mp4

       o   Segment the input file according to the split points	specified by
	   the segment_times option:

		   ffmpeg -i in.mkv -codec copy	-map 0 -f segment -segment_list	out.csv	-segment_times 1,2,3,5,8,13,21 out%03d.nut

       o   Use the ffmpeg force_key_frames option to force key frames in the
	   input at the	specified location, together with the segment option
	   segment_time_delta to account for possible roundings	operated when
	   setting key frame times.

		   ffmpeg -i in.mkv -force_key_frames 1,2,3,5,8,13,21 -codec:v mpeg4 -codec:a pcm_s16le	-map 0 \
		   -f segment -segment_list out.csv -segment_times 1,2,3,5,8,13,21 -segment_time_delta 0.05 out%03d.nut

	   In order to force key frames	on the input file, transcoding is
	   required.

       o   Segment the input file by splitting the input file according	to the
	   frame numbers sequence specified with the segment_frames option:

		   ffmpeg -i in.mkv -codec copy	-map 0 -f segment -segment_list	out.csv	-segment_frames	100,200,300,500,800 out%03d.nut

       o   Convert the in.mkv to TS segments using the "libx264" and "aac"
	   encoders:

		   ffmpeg -i in.mkv -map 0 -codec:v libx264 -codec:a aac -f ssegment -segment_list out.list out%03d.ts

       o   Segment the input file, and create an M3U8 live playlist (can be
	   used	as live	HLS source):

		   ffmpeg -re -i in.mkv	-codec copy -map 0 -f segment -segment_list playlist.m3u8 \
		   -segment_list_flags +live -segment_time 10 out%03d.mkv

   smoothstreaming
       Smooth Streaming	muxer generates	a set of files (Manifest, chunks)
       suitable	for serving with conventional web server.

       window_size
	   Specify the number of fragments kept	in the manifest. Default 0
	   (keep all).

       extra_window_size
	   Specify the number of fragments kept	outside	of the manifest	before
	   removing from disk. Default 5.

       lookahead_count
	   Specify the number of lookahead fragments. Default 2.

       min_frag_duration
	   Specify the minimum fragment	duration (in microseconds). Default
	   5000000.

       remove_at_exit
	   Specify whether to remove all fragments when	finished. Default 0
	   (do not remove).

   fifo
       The fifo	pseudo-muxer allows the	separation of encoding and muxing by
       using first-in-first-out	queue and running the actual muxer in a
       separate	thread.	This is	especially useful in combination with the tee
       muxer and can be	used to	send data to several destinations with
       different reliability/writing speed/latency.

       API users should	be aware that callback functions (interrupt_callback,
       io_open and io_close) used within its AVFormatContext must be thread-
       safe.

       The behavior of the fifo	muxer if the queue fills up or if the output
       fails is	selectable,

       o   output can be transparently restarted with configurable delay
	   between retries based on real time or time of the processed stream.

       o   encoding can	be blocked during temporary failure, or	continue
	   transparently dropping packets in case fifo queue fills up.

       fifo_format
	   Specify the format name. Useful if it cannot	be guessed from	the
	   output name suffix.

       queue_size
	   Specify size	of the queue (number of	packets). Default value	is 60.

       format_opts
	   Specify format options for the underlying muxer. Muxer options can
	   be specified	as a list of key=value pairs separated by ':'.

       drop_pkts_on_overflow bool
	   If set to 1 (true), in case the fifo	queue fills up,	packets	will
	   be dropped rather than blocking the encoder.	This makes it possible
	   to continue streaming without delaying the input, at	the cost of
	   omitting part of the	stream.	By default this	option is set to 0
	   (false), so in such cases the encoder will be blocked until the
	   muxer processes some	of the packets and none	of them	is lost.

       attempt_recovery	bool
	   If failure occurs, attempt to recover the output. This is
	   especially useful when used with network output, since it makes it
	   possible to restart streaming transparently.	 By default this
	   option is set to 0 (false).

       max_recovery_attempts
	   Sets	maximum	number of successive unsuccessful recovery attempts
	   after which the output fails	permanently. By	default	this option is
	   set to 0 (unlimited).

       recovery_wait_time duration
	   Waiting time	before the next	recovery attempt after previous
	   unsuccessful	recovery attempt. Default value	is 5 seconds.

       recovery_wait_streamtime	bool
	   If set to 0 (false),	the real time is used when waiting for the
	   recovery attempt (i.e. the recovery will be attempted after at
	   least recovery_wait_time seconds).  If set to 1 (true), the time of
	   the processed stream	is taken into account instead (i.e. the
	   recovery will be attempted after at least recovery_wait_time
	   seconds of the stream is omitted).  By default, this	option is set
	   to 0	(false).

       recover_any_error bool
	   If set to 1 (true), recovery	will be	attempted regardless of	type
	   of the error	causing	the failure. By	default	this option is set to
	   0 (false) and in case of certain (usually permanent)	errors the
	   recovery is not attempted even when attempt_recovery	is set to 1.

       restart_with_keyframe bool
	   Specify whether to wait for the keyframe after recovering from
	   queue overflow or failure. This option is set to 0 (false) by
	   default.

       Examples

       o   Stream something to rtmp server, continue processing	the stream at
	   real-time rate even in case of temporary failure (network outage)
	   and attempt to recover streaming every second indefinitely.

		   ffmpeg -re -i ... -c:v libx264 -c:a aac -f fifo -fifo_format	flv -map 0:v -map 0:a
		     -drop_pkts_on_overflow 1 -attempt_recovery	1 -recovery_wait_time 1	rtmp://example.com/live/stream_name

   tee
       The tee muxer can be used to write the same data	to several files or
       any other kind of muxer.	It can be used,	for example, to	both stream a
       video to	the network and	save it	to disk	at the same time.

       It is different from specifying several outputs to the ffmpeg command-
       line tool because the audio and video data will be encoded only once
       with the	tee muxer; encoding can	be a very expensive process. It	is not
       useful when using the libavformat API directly because it is then
       possible	to feed	the same packets to several muxers directly.

       use_fifo	bool
	   If set to 1,	slave outputs will be processed	in separate thread
	   using fifo muxer. This allows to compensate for different
	   speed/latency/reliability of	outputs	and setup transparent
	   recovery. By	default	this feature is	turned off.

       fifo_options
	   Options to pass to fifo pseudo-muxer	instances. See fifo.

       The slave outputs are specified in the file name	given to the muxer,
       separated by '|'. If any	of the slave name contains the '|' separator,
       leading or trailing spaces or any special character, it must be escaped
       (see the	"Quoting and escaping" section in the ffmpeg-utils(1) manual).

       Muxer options can be specified for each slave by	prepending them	as a
       list of key=value pairs separated by ':', between square	brackets. If
       the options values contain a special character or the ':' separator,
       they must be escaped; note that this is a second	level escaping.

       The following special options are also recognized:

       f   Specify the format name. Useful if it cannot	be guessed from	the
	   output name suffix.

       bsfs[/spec]
	   Specify a list of bitstream filters to apply	to the specified
	   output.

       use_fifo	bool
	   This	allows to override tee muxer use_fifo option for individual
	   slave muxer.

       fifo_options
	   This	allows to override tee muxer fifo_options for individual slave
	   muxer.  See fifo.

	   It is possible to specify to	which streams a	given bitstream	filter
	   applies, by appending a stream specifier to the option separated by
	   "/".	spec must be a stream specifier	(see Format stream
	   specifiers).	 If the	stream specifier is not	specified, the
	   bitstream filters will be applied to	all streams in the output.

	   Several bitstream filters can be specified, separated by ",".

       select
	   Select the streams that should be mapped to the slave output,
	   specified by	a stream specifier. If not specified, this defaults to
	   all the input streams. You may use multiple stream specifiers
	   separated by	commas (",") e.g.: "a:0,v"

       onfail
	   Specify behaviour on	output failure.	This can be set	to either
	   "abort" (which is default) or "ignore". "abort" will	cause whole
	   process to fail in case of failure on this slave output. "ignore"
	   will	ignore failure on this output, so other	outputs	will continue
	   without being affected.

       Examples

       o   Encode something and	both archive it	in a WebM file and stream it
	   as MPEG-TS over UDP (the streams need to be explicitly mapped):

		   ffmpeg -i ... -c:v libx264 -c:a mp2 -f tee -map 0:v -map 0:a
		     "archive-20121107.mkv|[f=mpegts]udp://10.0.1.255:1234/"

       o   As above, but continue streaming even if output to local file fails
	   (for	example	local drive fills up):

		   ffmpeg -i ... -c:v libx264 -c:a mp2 -f tee -map 0:v -map 0:a
		     "[onfail=ignore]archive-20121107.mkv|[f=mpegts]udp://10.0.1.255:1234/"

       o   Use ffmpeg to encode	the input, and send the	output to three
	   different destinations. The "dump_extra" bitstream filter is	used
	   to add extradata information	to all the output video	keyframes
	   packets, as requested by the	MPEG-TS	format.	The select option is
	   applied to out.aac in order to make it contain only audio packets.

		   ffmpeg -i ... -map 0	-flags +global_header -c:v libx264 -c:a	aac
			  -f tee "[bsfs/v=dump_extra]out.ts|[movflags=+faststart]out.mp4|[select=a]out.aac"

       o   As below, but select	only stream "a:1" for the audio	output.	Note
	   that	a second level escaping	must be	performed, as ":" is a special
	   character used to separate options.

		   ffmpeg -i ... -map 0	-flags +global_header -c:v libx264 -c:a	aac
			  -f tee "[bsfs/v=dump_extra]out.ts|[movflags=+faststart]out.mp4|[select=\'a:1\']out.aac"

       Note: some codecs may need different options depending on the output
       format; the auto-detection of this can not work with the	tee muxer. The
       main example is the global_header flag.

   webm_dash_manifest
       WebM DASH Manifest muxer.

       This muxer implements the WebM DASH Manifest specification to generate
       the DASH	manifest XML. It also supports manifest	generation for DASH
       live streams.

       For more	information see:

       o   WebM	DASH Specification:
	   <https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification>

       o   ISO DASH Specification:
	   <http://standards.iso.org/ittf/PubliclyAvailableStandards/c065274_ISO_IEC_23009-1_2014.zip>

       Options

       This muxer supports the following options:

       adaptation_sets
	   This	option has the following syntax: "id=x,streams=a,b,c
	   id=y,streams=d,e" where x and y are the unique identifiers of the
	   adaptation sets and a,b,c,d and e are the indices of	the
	   corresponding audio and video streams. Any number of	adaptation
	   sets	can be added using this	option.

       live
	   Set this to 1 to create a live stream DASH Manifest.	Default: 0.

       chunk_start_index
	   Start index of the first chunk. This	will go	in the startNumber
	   attribute of	the SegmentTemplate element in the manifest. Default:
	   0.

       chunk_duration_ms
	   Duration of each chunk in milliseconds. This	will go	in the
	   duration attribute of the SegmentTemplate element in	the manifest.
	   Default: 1000.

       utc_timing_url
	   URL of the page that	will return the	UTC timestamp in ISO format.
	   This	will go	in the value attribute of the UTCTiming	element	in the
	   manifest.  Default: None.

       time_shift_buffer_depth
	   Smallest time (in seconds) shifting buffer for which	any
	   Representation is guaranteed	to be available. This will go in the
	   timeShiftBufferDepth	attribute of the MPD element. Default: 60.

       minimum_update_period
	   Minimum update period (in seconds) of the manifest. This will go in
	   the minimumUpdatePeriod attribute of	the MPD	element. Default: 0.

       Example

	       ffmpeg -f webm_dash_manifest -i video1.webm \
		      -f webm_dash_manifest -i video2.webm \
		      -f webm_dash_manifest -i audio1.webm \
		      -f webm_dash_manifest -i audio2.webm \
		      -map 0 -map 1 -map 2 -map	3 \
		      -c copy \
		      -f webm_dash_manifest \
		      -adaptation_sets "id=0,streams=0,1 id=1,streams=2,3" \
		      manifest.xml

   webm_chunk
       WebM Live Chunk Muxer.

       This muxer writes out WebM headers and chunks as	separate files which
       can be consumed by clients that support WebM Live streams via DASH.

       Options

       This muxer supports the following options:

       chunk_start_index
	   Index of the	first chunk (defaults to 0).

       header
	   Filename of the header where	the initialization data	will be
	   written.

       audio_chunk_duration
	   Duration of each audio chunk	in milliseconds	(defaults to 5000).

       Example

	       ffmpeg -f v4l2 -i /dev/video0 \
		      -f alsa -i hw:0 \
		      -map 0:0 \
		      -c:v libvpx-vp9 \
		      -s 640x360 -keyint_min 30	-g 30 \
		      -f webm_chunk \
		      -header webm_live_video_360.hdr \
		      -chunk_start_index 1 \
		      webm_live_video_360_%d.chk \
		      -map 1:0 \
		      -c:a libvorbis \
		      -b:a 128k	\
		      -f webm_chunk \
		      -header webm_live_audio_128.hdr \
		      -chunk_start_index 1 \
		      -audio_chunk_duration 1000 \
		      webm_live_audio_128_%d.chk

METADATA
       FFmpeg is able to dump metadata from media files	into a simple
       UTF-8-encoded INI-like text file	and then load it back using the
       metadata	muxer/demuxer.

       The file	format is as follows:

       1.  A file consists of a	header and a number of metadata	tags divided
	   into	sections, each on its own line.

       2.  The header is a ;FFMETADATA string, followed	by a version number
	   (now	1).

       3.  Metadata tags are of	the form key=value

       4.  Immediately after header follows global metadata

       5.  After global	metadata there may be sections with
	   per-stream/per-chapter metadata.

       6.  A section starts with the section name in uppercase (i.e. STREAM or
	   CHAPTER) in brackets	([, ]) and ends	with next section or end of
	   file.

       7.  At the beginning of a chapter section there may be an optional
	   timebase to be used for start/end values. It	must be	in form
	   TIMEBASE=num/den, where num and den are integers. If	the timebase
	   is missing then start/end times are assumed to be in	milliseconds.

	   Next	a chapter section must contain chapter start and end times in
	   form	START=num, END=num, where num is a positive integer.

       8.  Empty lines and lines starting with ; or # are ignored.

       9.  Metadata keys or values containing special characters (=, ;,	#, \
	   and a newline) must be escaped with a backslash \.

       10. Note	that whitespace	in metadata (e.g. foo =	bar) is	considered to
	   be a	part of	the tag	(in the	example	above key is foo , value is
	    bar).

       A ffmetadata file might look like this:

	       ;FFMETADATA1
	       title=bike\\shed
	       ;this is	a comment
	       artist=FFmpeg troll team

	       [CHAPTER]
	       TIMEBASE=1/1000
	       START=0
	       #chapter	ends at	0:01:00
	       END=60000
	       title=chapter \#1
	       [STREAM]
	       title=multi\
	       line

       By using	the ffmetadata muxer and demuxer it is possible	to extract
       metadata	from an	input file to an ffmetadata file, and then transcode
       the file	into an	output file with the edited ffmetadata file.

       Extracting an ffmetadata	file with ffmpeg goes as follows:

	       ffmpeg -i INPUT -f ffmetadata FFMETADATAFILE

       Reinserting edited metadata information from the	FFMETADATAFILE file
       can be done as:

	       ffmpeg -i INPUT -i FFMETADATAFILE -map_metadata 1 -codec	copy OUTPUT

SEE ALSO
       ffmpeg(1), ffplay(1), ffprobe(1), ffserver(1), libavformat(3)

AUTHORS
       The FFmpeg developers.

       For details about the authorship, see the Git history of	the project
       (git://source.ffmpeg.org/ffmpeg), e.g. by typing	the command git	log in
       the FFmpeg source directory, or browsing	the online repository at
       <http://source.ffmpeg.org>.

       Maintainers for the specific components are listed in the file
       MAINTAINERS in the source code tree.

							     FFMPEG-FORMATS(1)

NAME | DESCRIPTION | FORMAT OPTIONS | DEMUXERS | MUXERS | METADATA | SEE ALSO | AUTHORS

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