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FFMPEG-DEVICES(1)					     FFMPEG-DEVICES(1)

NAME
       ffmpeg-devices -	FFmpeg devices

DESCRIPTION
       This document describes the input and output devices provided by	the
       libavdevice library.

DEVICE OPTIONS
       The libavdevice library provides	the same interface as libavformat.
       Namely, an input	device is considered like a demuxer, and an output
       device like a muxer, and	the interface and generic device options are
       the same	provided by libavformat	(see the ffmpeg-formats	manual).

       In addition each	input or output	device 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 device "AVFormatContext" options
       or using	the libavutil/opt.h API	for programmatic use.

INPUT DEVICES
       Input devices are configured elements in	FFmpeg which enable accessing
       the data	coming from a multimedia device	attached to your system.

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

       You can disable all the input devices using the configure option
       "--disable-indevs", and selectively enable an input device using	the
       option "--enable-indev=INDEV", or you can disable a particular input
       device using the	option "--disable-indev=INDEV".

       The option "-devices" of	the ff*	tools will display the list of
       supported input devices.

       A description of	the currently available	input devices follows.

   alsa
       ALSA (Advanced Linux Sound Architecture)	input device.

       To enable this input device during configuration	you need libasound
       installed on your system.

       This device allows capturing from an ALSA device. The name of the
       device to capture has to	be an ALSA card	identifier.

       An ALSA identifier has the syntax:

	       hw:<CARD>[,<DEV>[,<SUBDEV>]]

       where the DEV and SUBDEV	components are optional.

       The three arguments (in order: CARD,DEV,SUBDEV) specify card number or
       identifier, device number and subdevice number (-1 means	any).

       To see the list of cards	currently recognized by	your system check the
       files /proc/asound/cards	and /proc/asound/devices.

       For example to capture with ffmpeg from an ALSA device with card	id 0,
       you may run the command:

	       ffmpeg -f alsa -i hw:0 alsaout.wav

       For more	information see:
       <http://www.alsa-project.org/alsa-doc/alsa-lib/pcm.html>

       Options

       sample_rate
	   Set the sample rate in Hz. Default is 48000.

       channels
	   Set the number of channels. Default is 2.

   avfoundation
       AVFoundation input device.

       AVFoundation is the currently recommended framework by Apple for
       streamgrabbing on OSX >=	10.7 as	well as	on iOS.	 The older QTKit
       framework has been marked deprecated since OSX version 10.7.

       The input filename has to be given in the following syntax:

	       -i "[[VIDEO]:[AUDIO]]"

       The first entry selects the video input while the latter	selects	the
       audio input.  The stream	has to be specified by the device name or the
       device index as shown by	the device list.  Alternatively, the video
       and/or audio input device can be	chosen by index	using the

	   B<-video_device_index E<lt>INDEXE<gt>>

       and/or

	   B<-audio_device_index E<lt>INDEXE<gt>>

       , overriding any	device name or index given in the input	filename.

       All available devices can be enumerated by using	-list_devices true,
       listing all device names	and corresponding indices.

       There are two device name aliases:

       "default"
	   Select the AVFoundation default device of the corresponding type.

       "none"
	   Do not record the corresponding media type.	This is	equivalent to
	   specifying an empty device name or index.

       Options

       AVFoundation supports the following options:

       -list_devices <TRUE|FALSE>
	   If set to true, a list of all available input devices is given
	   showing all device names and	indices.

       -video_device_index <INDEX>
	   Specify the video device by its index. Overrides anything given in
	   the input filename.

       -audio_device_index <INDEX>
	   Specify the audio device by its index. Overrides anything given in
	   the input filename.

       -pixel_format <FORMAT>
	   Request the video device to use a specific pixel format.  If	the
	   specified format is not supported, a	list of	available formats is
	   given and the first one in this list	is used	instead. Available
	   pixel formats are: "monob, rgb555be,	rgb555le, rgb565be, rgb565le,
	   rgb24, bgr24, 0rgb, bgr0, 0bgr, rgb0,
	    bgr48be, uyvy422, yuva444p,	yuva444p16le, yuv444p, yuv422p16,
	   yuv422p10, yuv444p10,
	    yuv420p, nv12, yuyv422, gray"

       -framerate
	   Set the grabbing frame rate.	Default	is "ntsc", corresponding to a
	   frame rate of "30000/1001".

       -video_size
	   Set the video frame size.

       -capture_cursor
	   Capture the mouse pointer. Default is 0.

       -capture_mouse_clicks
	   Capture the screen mouse clicks. Default is 0.

       Examples

       o   Print the list of AVFoundation supported devices and	exit:

		   $ ffmpeg -f avfoundation -list_devices true -i ""

       o   Record video	from video device 0 and	audio from audio device	0 into
	   out.avi:

		   $ ffmpeg -f avfoundation -i "0:0" out.avi

       o   Record video	from video device 2 and	audio from audio device	1 into
	   out.avi:

		   $ ffmpeg -f avfoundation -video_device_index	2 -i ":1" out.avi

       o   Record video	from the system	default	video device using the pixel
	   format bgr0 and do not record any audio into	out.avi:

		   $ ffmpeg -f avfoundation -pixel_format bgr0 -i "default:none" out.avi

   bktr
       BSD video input device.

       Options

       framerate
	   Set the frame rate.

       video_size
	   Set the video frame size. Default is	"vga".

       standard
	   Available values are:

	   pal
	   ntsc
	   secam
	   paln
	   palm
	   ntscj

   decklink
       The decklink input device provides capture capabilities for Blackmagic
       DeckLink	devices.

       To enable this input device, you	need the Blackmagic DeckLink SDK and
       you need	to configure with the appropriate "--extra-cflags" and
       "--extra-ldflags".  On Windows, you need	to run the IDL files through
       widl.

       DeckLink	is very	picky about the	formats	it supports. Pixel format is
       uyvy422 or v210,	framerate and video size must be determined for	your
       device with -list_formats 1. Audio sample rate is always	48 kHz and the
       number of channels can be 2, 8 or 16. Note that all audio channels are
       bundled in one single audio track.

       Options

       list_devices
	   If set to true, print a list	of devices and exit.  Defaults to
	   false.

       list_formats
	   If set to true, print a list	of supported formats and exit.
	   Defaults to false.

       format_code <FourCC>
	   This	sets the input video format to the format given	by the FourCC.
	   To see the supported	values of your device(s) use list_formats.
	   Note	that there is a	FourCC 'pal ' that can also be used as pal (3
	   letters).

       bm_v210
	   If set to 1,	video is captured in 10	bit v210 instead of uyvy422.
	   Not all Blackmagic devices support this option.

       teletext_lines
	   If set to nonzero, an additional teletext stream will be captured
	   from	the vertical ancillary data. This option is a bitmask of the
	   VBI lines checked, specifically lines 6 to 22, and lines 318	to
	   335.	Line 6 is the LSB in the mask.	Selected lines which do	not
	   contain teletext information	will be	ignored. You can use the
	   special all constant	to select all possible lines, or standard to
	   skip	lines 6, 318 and 319, which are	not compatible with all
	   receivers. Capturing	teletext only works for	SD PAL sources in 8
	   bit mode.  To use this option, ffmpeg needs to be compiled with
	   "--enable-libzvbi".

       channels
	   Defines number of audio channels to capture.	Must be	2, 8 or	16.
	   Defaults to 2.

       duplex_mode
	   Sets	the decklink device duplex mode. Must be unset,	half or	full.
	   Defaults to unset.

       video_input
	   Sets	the video input	source.	Must be	unset, sdi, hdmi, optical_sdi,
	   component, composite	or s_video.  Defaults to unset.

       audio_input
	   Sets	the audio input	source.	Must be	unset, embedded, aes_ebu,
	   analog, analog_xlr, analog_rca or microphone. Defaults to unset.

       video_pts
	   Sets	the video packet timestamp source. Must	be video, audio,
	   reference or	wallclock. Defaults to video.

       audio_pts
	   Sets	the audio packet timestamp source. Must	be video, audio,
	   reference or	wallclock. Defaults to audio.

       draw_bars
	   If set to true, color bars are drawn	in the event of	a signal loss.
	   Defaults to true.

       Examples

       o   List	input devices:

		   ffmpeg -f decklink -list_devices 1 -i dummy

       o   List	supported formats:

		   ffmpeg -f decklink -list_formats 1 -i 'Intensity Pro'

       o   Capture video clip at 1080i50:

		   ffmpeg -format_code Hi50 -f decklink	-i 'Intensity Pro' -acodec copy	-vcodec	copy output.avi

       o   Capture video clip at 1080i50 10 bit:

		   ffmpeg -bm_v210 1 -format_code Hi50 -f decklink -i 'UltraStudio Mini	Recorder' -acodec copy -vcodec copy output.avi

       o   Capture video clip at 1080i50 with 16 audio channels:

		   ffmpeg -channels 16 -format_code Hi50 -f decklink -i	'UltraStudio Mini Recorder' -acodec copy -vcodec copy output.avi

   dshow
       Windows DirectShow input	device.

       DirectShow support is enabled when FFmpeg is built with the mingw-w64
       project.	 Currently only	audio and video	devices	are supported.

       Multiple	devices	may be opened as separate inputs, but they may also be
       opened on the same input, which should improve synchronism between
       them.

       The input name should be	in the format:

	       <TYPE>=<NAME>[:<TYPE>=<NAME>]

       where TYPE can be either	audio or video,	and NAME is the	device's name
       or alternative name..

       Options

       If no options are specified, the	device's defaults are used.  If	the
       device does not support the requested options, it will fail to open.

       video_size
	   Set the video size in the captured video.

       framerate
	   Set the frame rate in the captured video.

       sample_rate
	   Set the sample rate (in Hz) of the captured audio.

       sample_size
	   Set the sample size (in bits) of the	captured audio.

       channels
	   Set the number of channels in the captured audio.

       list_devices
	   If set to true, print a list	of devices and exit.

       list_options
	   If set to true, print a list	of selected device's options and exit.

       video_device_number
	   Set video device number for devices with the	same name (starts at
	   0, defaults to 0).

       audio_device_number
	   Set audio device number for devices with the	same name (starts at
	   0, defaults to 0).

       pixel_format
	   Select pixel	format to be used by DirectShow. This may only be set
	   when	the video codec	is not set or set to rawvideo.

       audio_buffer_size
	   Set audio device buffer size	in milliseconds	(which can directly
	   impact latency, depending on	the device).  Defaults to using	the
	   audio device's default buffer size (typically some multiple of
	   500ms).  Setting this value too low can degrade performance.	 See
	   also
	   <http://msdn.microsoft.com/en-us/library/windows/desktop/dd377582(v=vs.85).aspx>

       video_pin_name
	   Select video	capture	pin to use by name or alternative name.

       audio_pin_name
	   Select audio	capture	pin to use by name or alternative name.

       crossbar_video_input_pin_number
	   Select video	input pin number for crossbar device. This will	be
	   routed to the crossbar device's Video Decoder output	pin.  Note
	   that	changing this value can	affect future invocations (sets	a new
	   default) until system reboot	occurs.

       crossbar_audio_input_pin_number
	   Select audio	input pin number for crossbar device. This will	be
	   routed to the crossbar device's Audio Decoder output	pin.  Note
	   that	changing this value can	affect future invocations (sets	a new
	   default) until system reboot	occurs.

       show_video_device_dialog
	   If set to true, before capture starts, popup	a display dialog to
	   the end user, allowing them to change video filter properties and
	   configurations manually.  Note that for crossbar devices, adjusting
	   values in this dialog may be	needed at times	to toggle between PAL
	   (25 fps) and	NTSC (29.97) input frame rates,	sizes, interlacing,
	   etc.	 Changing these	values can enable different scan rates/frame
	   rates and avoiding green bars at the	bottom,	flickering scan	lines,
	   etc.	 Note that with	some devices, changing these properties	can
	   also	affect future invocations (sets	new defaults) until system
	   reboot occurs.

       show_audio_device_dialog
	   If set to true, before capture starts, popup	a display dialog to
	   the end user, allowing them to change audio filter properties and
	   configurations manually.

       show_video_crossbar_connection_dialog
	   If set to true, before capture starts, popup	a display dialog to
	   the end user, allowing them to manually modify crossbar pin
	   routings, when it opens a video device.

       show_audio_crossbar_connection_dialog
	   If set to true, before capture starts, popup	a display dialog to
	   the end user, allowing them to manually modify crossbar pin
	   routings, when it opens an audio device.

       show_analog_tv_tuner_dialog
	   If set to true, before capture starts, popup	a display dialog to
	   the end user, allowing them to manually modify TV channels and
	   frequencies.

       show_analog_tv_tuner_audio_dialog
	   If set to true, before capture starts, popup	a display dialog to
	   the end user, allowing them to manually modify TV audio (like mono
	   vs. stereo, Language	A,B or C).

       audio_device_load
	   Load	an audio capture filter	device from file instead of searching
	   it by name. It may load additional parameters too, if the filter
	   supports the	serialization of its properties	to.  To	use this an
	   audio capture source	has to be specified, but it can	be anything
	   even	fake one.

       audio_device_save
	   Save	the currently used audio capture filter	device and its
	   parameters (if the filter supports it) to a file.  If a file	with
	   the same name exists	it will	be overwritten.

       video_device_load
	   Load	a video	capture	filter device from file	instead	of searching
	   it by name. It may load additional parameters too, if the filter
	   supports the	serialization of its properties	to.  To	use this a
	   video capture source	has to be specified, but it can	be anything
	   even	fake one.

       video_device_save
	   Save	the currently used video capture filter	device and its
	   parameters (if the filter supports it) to a file.  If a file	with
	   the same name exists	it will	be overwritten.

       Examples

       o   Print the list of DirectShow	supported devices and exit:

		   $ ffmpeg -list_devices true -f dshow	-i dummy

       o   Open	video device Camera:

		   $ ffmpeg -f dshow -i	video="Camera"

       o   Open	second video device with name Camera:

		   $ ffmpeg -f dshow -video_device_number 1 -i video="Camera"

       o   Open	video device Camera and	audio device Microphone:

		   $ ffmpeg -f dshow -i	video="Camera":audio="Microphone"

       o   Print the list of supported options in selected device and exit:

		   $ ffmpeg -list_options true -f dshow	-i video="Camera"

       o   Specify pin names to	capture	by name	or alternative name, specify
	   alternative device name:

		   $ ffmpeg -f dshow -audio_pin_name "Audio Out" -video_pin_name 2 -i video=video="@device_pnp_\\?\pci#ven_1a0a&dev_6200&subsys_62021461&rev_01#4&e2c7dd6&0&00e1#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\{ca465100-deb0-4d59-818f-8c477184adf6}":audio="Microphone"

       o   Configure a crossbar	device,	specifying crossbar pins, allow	user
	   to adjust video capture properties at startup:

		   $ ffmpeg -f dshow -show_video_device_dialog true -crossbar_video_input_pin_number 0
			-crossbar_audio_input_pin_number 3 -i video="AVerMedia BDA Analog Capture":audio="AVerMedia BDA	Analog Capture"

   dv1394
       Linux DV	1394 input device.

       Options

       framerate
	   Set the frame rate. Default is 25.

       standard
	   Available values are:

	   pal
	   ntsc

	   Default value is "ntsc".

   fbdev
       Linux framebuffer input device.

       The Linux framebuffer is	a graphic hardware-independent abstraction
       layer to	show graphics on a computer monitor, typically on the console.
       It is accessed through a	file device node, usually /dev/fb0.

       For more	detailed information read the file
       Documentation/fb/framebuffer.txt	included in the	Linux source tree.

       See also	<http://linux-fbdev.sourceforge.net/>, and fbset(1).

       To record from the framebuffer device /dev/fb0 with ffmpeg:

	       ffmpeg -f fbdev -framerate 10 -i	/dev/fb0 out.avi

       You can take a single screenshot	image with the command:

	       ffmpeg -f fbdev -framerate 1 -i /dev/fb0	-frames:v 1 screenshot.jpeg

       Options

       framerate
	   Set the frame rate. Default is 25.

   gdigrab
       Win32 GDI-based screen capture device.

       This device allows you to capture a region of the display on Windows.

       There are two options for the input filename:

	       desktop

       or

	       title=<window_title>

       The first option	will capture the entire	desktop, or a fixed region of
       the desktop. The	second option will instead capture the contents	of a
       single window, regardless of its	position on the	screen.

       For example, to grab the	entire desktop using ffmpeg:

	       ffmpeg -f gdigrab -framerate 6 -i desktop out.mpg

       Grab a 640x480 region at	position "10,20":

	       ffmpeg -f gdigrab -framerate 6 -offset_x	10 -offset_y 20	-video_size vga	-i desktop out.mpg

       Grab the	contents of the	window named "Calculator"

	       ffmpeg -f gdigrab -framerate 6 -i title=Calculator out.mpg

       Options

       draw_mouse
	   Specify whether to draw the mouse pointer. Use the value 0 to not
	   draw	the pointer. Default value is 1.

       framerate
	   Set the grabbing frame rate.	Default	value is "ntsc", corresponding
	   to a	frame rate of "30000/1001".

       show_region
	   Show	grabbed	region on screen.

	   If show_region is specified with 1, then the	grabbing region	will
	   be indicated	on screen. With	this option, it	is easy	to know	what
	   is being grabbed if only a portion of the screen is grabbed.

	   Note	that show_region is incompatible with grabbing the contents of
	   a single window.

	   For example:

		   ffmpeg -f gdigrab -show_region 1 -framerate 6 -video_size cif -offset_x 10 -offset_y	20 -i desktop out.mpg

       video_size
	   Set the video frame size. The default is to capture the full	screen
	   if desktop is selected, or the full window size if
	   title=window_title is selected.

       offset_x
	   When	capturing a region with	video_size, set	the distance from the
	   left	edge of	the screen or desktop.

	   Note	that the offset	calculation is from the	top left corner	of the
	   primary monitor on Windows. If you have a monitor positioned	to the
	   left	of your	primary	monitor, you will need to use a	negative
	   offset_x value to move the region to	that monitor.

       offset_y
	   When	capturing a region with	video_size, set	the distance from the
	   top edge of the screen or desktop.

	   Note	that the offset	calculation is from the	top left corner	of the
	   primary monitor on Windows. If you have a monitor positioned	above
	   your	primary	monitor, you will need to use a	negative offset_y
	   value to move the region to that monitor.

   iec61883
       FireWire	DV/HDV input device using libiec61883.

       To enable this input device, you	need libiec61883, libraw1394 and
       libavc1394 installed on your system. Use	the configure option
       "--enable-libiec61883" to compile with the device enabled.

       The iec61883 capture device supports capturing from a video device
       connected via IEEE1394 (FireWire), using	libiec61883 and	the new	Linux
       FireWire	stack (juju). This is the default DV/HDV input method in Linux
       Kernel 2.6.37 and later,	since the old FireWire stack was removed.

       Specify the FireWire port to be used as input file, or "auto" to	choose
       the first port connected.

       Options

       dvtype
	   Override autodetection of DV/HDV. This should only be used if auto
	   detection does not work, or if usage	of a different device type
	   should be prohibited. Treating a DV device as HDV (or vice versa)
	   will	not work and result in undefined behavior.  The	values auto,
	   dv and hdv are supported.

       dvbuffer
	   Set maximum size of buffer for incoming data, in frames. For	DV,
	   this	is an exact value. For HDV, it is not frame exact, since HDV
	   does	not have a fixed frame size.

       dvguid
	   Select the capture device by	specifying its GUID. Capturing will
	   only	be performed from the specified	device and fails if no device
	   with	the given GUID is found. This is useful	to select the input if
	   multiple devices are	connected at the same time.  Look at
	   /sys/bus/firewire/devices to	find out the GUIDs.

       Examples

       o   Grab	and show the input of a	FireWire DV/HDV	device.

		   ffplay -f iec61883 -i auto

       o   Grab	and record the input of	a FireWire DV/HDV device, using	a
	   packet buffer of 100000 packets if the source is HDV.

		   ffmpeg -f iec61883 -i auto -hdvbuffer 100000	out.mpg

   jack
       JACK input device.

       To enable this input device during configuration	you need libjack
       installed on your system.

       A JACK input device creates one or more JACK writable clients, one for
       each audio channel, with	name client_name:input_N, where	client_name is
       the name	provided by the	application, and N is a	number which
       identifies the channel.	Each writable client will send the acquired
       data to the FFmpeg input	device.

       Once you	have created one or more JACK readable clients,	you need to
       connect them to one or more JACK	writable clients.

       To connect or disconnect	JACK clients you can use the jack_connect and
       jack_disconnect programs, or do it through a graphical interface, for
       example with qjackctl.

       To list the JACK	clients	and their properties you can invoke the
       command jack_lsp.

       Follows an example which	shows how to capture a JACK readable client
       with ffmpeg.

	       # Create	a JACK writable	client with name "ffmpeg".
	       $ ffmpeg	-f jack	-i ffmpeg -y out.wav

	       # Start the sample jack_metro readable client.
	       $ jack_metro -b 120 -d 0.2 -f 4000

	       # List the current JACK clients.
	       $ jack_lsp -c
	       system:capture_1
	       system:capture_2
	       system:playback_1
	       system:playback_2
	       ffmpeg:input_1
	       metro:120_bpm

	       # Connect metro to the ffmpeg writable client.
	       $ jack_connect metro:120_bpm ffmpeg:input_1

       For more	information read: <http://jackaudio.org/>

       Options

       channels
	   Set the number of channels. Default is 2.

   lavfi
       Libavfilter input virtual device.

       This input device reads data from the open output pads of a libavfilter
       filtergraph.

       For each	filtergraph open output, the input device will create a
       corresponding stream which is mapped to the generated output. Currently
       only video data is supported. The filtergraph is	specified through the
       option graph.

       Options

       graph
	   Specify the filtergraph to use as input. Each video open output
	   must	be labelled by a unique	string of the form "outN", where N is
	   a number starting from 0 corresponding to the mapped	input stream
	   generated by	the device.  The first unlabelled output is
	   automatically assigned to the "out0"	label, but all the others need
	   to be specified explicitly.

	   The suffix "+subcc" can be appended to the output label to create
	   an extra stream with	the closed captions packets attached to	that
	   output (experimental; only for EIA-608 / CEA-708 for	now).  The
	   subcc streams are created after all the normal streams, in the
	   order of the	corresponding stream.  For example, if there is
	   "out19+subcc", "out7+subcc" and up to "out42", the stream #43 is
	   subcc for stream #7 and stream #44 is subcc for stream #19.

	   If not specified defaults to	the filename specified for the input
	   device.

       graph_file
	   Set the filename of the filtergraph to be read and sent to the
	   other filters. Syntax of the	filtergraph is the same	as the one
	   specified by	the option graph.

       dumpgraph
	   Dump	graph to stderr.

       Examples

       o   Create a color video	stream and play	it back	with ffplay:

		   ffplay -f lavfi -graph "color=c=pink	[out0]"	dummy

       o   As the previous example, but	use filename for specifying the	graph
	   description,	and omit the "out0" label:

		   ffplay -f lavfi color=c=pink

       o   Create three	different video	test filtered sources and play them:

		   ffplay -f lavfi -graph "testsrc [out0]; testsrc,hflip [out1]; testsrc,negate	[out2]"	test3

       o   Read	an audio stream	from a file using the amovie source and	play
	   it back with	ffplay:

		   ffplay -f lavfi "amovie=test.wav"

       o   Read	an audio stream	and a video stream and play it back with
	   ffplay:

		   ffplay -f lavfi "movie=test.avi[out0];amovie=test.wav[out1]"

       o   Dump	decoded	frames to images and closed captions to	a file
	   (experimental):

		   ffmpeg -f lavfi -i "movie=test.ts[out0+subcc]" -map v frame%08d.png -map s -c copy -f rawvideo subcc.bin

   libcdio
       Audio-CD	input device based on libcdio.

       To enable this input device during configuration	you need libcdio
       installed on your system. It requires the configure option
       "--enable-libcdio".

       This device allows playing and grabbing from an Audio-CD.

       For example to copy with	ffmpeg the entire Audio-CD in /dev/sr0,	you
       may run the command:

	       ffmpeg -f libcdio -i /dev/sr0 cd.wav

       Options

       speed
	   Set drive reading speed. Default value is 0.

	   The speed is	specified CD-ROM speed units. The speed	is set through
	   the libcdio "cdio_cddap_speed_set" function.	On many	CD-ROM drives,
	   specifying a	value too large	will result in using the fastest
	   speed.

       paranoia_mode
	   Set paranoia	recovery mode flags. It	accepts	one of the following
	   values:

	   disable
	   verify
	   overlap
	   neverskip
	   full

	   Default value is disable.

	   For more information	about the available recovery modes, consult
	   the paranoia	project	documentation.

   libdc1394
       IIDC1394	input device, based on libdc1394 and libraw1394.

       Requires	the configure option "--enable-libdc1394".

   openal
       The OpenAL input	device provides	audio capture on all systems with a
       working OpenAL 1.1 implementation.

       To enable this input device during configuration, you need OpenAL
       headers and libraries installed on your system, and need	to configure
       FFmpeg with "--enable-openal".

       OpenAL headers and libraries should be provided as part of your OpenAL
       implementation, or as an	additional download (an	SDK). Depending	on
       your installation you may need to specify additional flags via the
       "--extra-cflags"	and "--extra-ldflags" for allowing the build system to
       locate the OpenAL headers and libraries.

       An incomplete list of OpenAL implementations follows:

       Creative
	   The official	Windows	implementation,	providing hardware
	   acceleration	with supported devices and software fallback.  See
	   <http://openal.org/>.

       OpenAL Soft
	   Portable, open source (LGPL)	software implementation. Includes
	   backends for	the most common	sound APIs on the Windows, Linux,
	   Solaris, and	BSD operating systems.	See
	   <http://kcat.strangesoft.net/openal.html>.

       Apple
	   OpenAL is part of Core Audio, the official Mac OS X Audio
	   interface.  See
	   <http://developer.apple.com/technologies/mac/audio-and-video.html>

       This device allows one to capture from an audio input device handled
       through OpenAL.

       You need	to specify the name of the device to capture in	the provided
       filename. If the	empty string is	provided, the device will
       automatically select the	default	device.	You can	get the	list of	the
       supported devices by using the option list_devices.

       Options

       channels
	   Set the number of channels in the captured audio. Only the values 1
	   (monaural) and 2 (stereo) are currently supported.  Defaults	to 2.

       sample_size
	   Set the sample size (in bits) of the	captured audio.	Only the
	   values 8 and	16 are currently supported. Defaults to	16.

       sample_rate
	   Set the sample rate (in Hz) of the captured audio.  Defaults	to
	   44.1k.

       list_devices
	   If set to true, print a list	of devices and exit.  Defaults to
	   false.

       Examples

       Print the list of OpenAL	supported devices and exit:

	       $ ffmpeg	-list_devices true -f openal -i	dummy out.ogg

       Capture from the	OpenAL device DR-BT101 via PulseAudio:

	       $ ffmpeg	-f openal -i 'DR-BT101 via PulseAudio' out.ogg

       Capture from the	default	device (note the empty string '' as filename):

	       $ ffmpeg	-f openal -i ''	out.ogg

       Capture from two	devices	simultaneously,	writing	to two different
       files, within the same ffmpeg command:

	       $ ffmpeg	-f openal -i 'DR-BT101 via PulseAudio' out1.ogg	-f openal -i 'ALSA Default' out2.ogg

       Note: not all OpenAL implementations support multiple simultaneous
       capture - try the latest	OpenAL Soft if the above does not work.

   oss
       Open Sound System input device.

       The filename to provide to the input device is the device node
       representing the	OSS input device, and is usually set to	/dev/dsp.

       For example to grab from	/dev/dsp using ffmpeg use the command:

	       ffmpeg -f oss -i	/dev/dsp /tmp/oss.wav

       For more	information about OSS see:
       <http://manuals.opensound.com/usersguide/dsp.html>

       Options

       sample_rate
	   Set the sample rate in Hz. Default is 48000.

       channels
	   Set the number of channels. Default is 2.

   pulse
       PulseAudio input	device.

       To enable this output device you	need to	configure FFmpeg with
       "--enable-libpulse".

       The filename to provide to the input device is a	source device or the
       string "default"

       To list the PulseAudio source devices and their properties you can
       invoke the command pactl	list sources.

       More information	about PulseAudio can be	found on
       <http://www.pulseaudio.org>.

       Options

       server
	   Connect to a	specific PulseAudio server, specified by an IP
	   address.  Default server is used when not provided.

       name
	   Specify the application name	PulseAudio will	use when showing
	   active clients, by default it is the	"LIBAVFORMAT_IDENT" string.

       stream_name
	   Specify the stream name PulseAudio will use when showing active
	   streams, by default it is "record".

       sample_rate
	   Specify the samplerate in Hz, by default 48kHz is used.

       channels
	   Specify the channels	in use,	by default 2 (stereo) is set.

       frame_size
	   Specify the number of bytes per frame, by default it	is set to
	   1024.

       fragment_size
	   Specify the minimal buffering fragment in PulseAudio, it will
	   affect the audio latency. By	default	it is unset.

       wallclock
	   Set the initial PTS using the current time. Default is 1.

       Examples

       Record a	stream from default device:

	       ffmpeg -f pulse -i default /tmp/pulse.wav

   qtkit
       QTKit input device.

       The filename passed as input is parsed to contain either	a device name
       or index.  The device index can also be given by	using
       -video_device_index.  A given device index will override	any given
       device name.  If	the desired device consists of numbers only, use
       -video_device_index to identify it.  The	default	device will be chosen
       if an empty string  or the device name "default"	is given.  The
       available devices can be	enumerated by using -list_devices.

	       ffmpeg -f qtkit -i "0" out.mpg

	       ffmpeg -f qtkit -video_device_index 0 -i	"" out.mpg

	       ffmpeg -f qtkit -i "default" out.mpg

	       ffmpeg -f qtkit -list_devices true -i ""

       Options

       frame_rate
	   Set frame rate. Default is 30.

       list_devices
	   If set to "true", print a list of devices and exit. Default is
	   "false".

       video_device_index
	   Select the video device by index for	devices	with the same name
	   (starts at 0).

   sndio
       sndio input device.

       To enable this input device during configuration	you need libsndio
       installed on your system.

       The filename to provide to the input device is the device node
       representing the	sndio input device, and	is usually set to /dev/audio0.

       For example to grab from	/dev/audio0 using ffmpeg use the command:

	       ffmpeg -f sndio -i /dev/audio0 /tmp/oss.wav

       Options

       sample_rate
	   Set the sample rate in Hz. Default is 48000.

       channels
	   Set the number of channels. Default is 2.

   video4linux2, v4l2
       Video4Linux2 input video	device.

       "v4l2" can be used as alias for "video4linux2".

       If FFmpeg is built with v4l-utils support (by using the
       "--enable-libv4l2" configure option), it	is possible to use it with the
       "-use_libv4l2" input device option.

       The name	of the device to grab is a file	device node, usually Linux
       systems tend to automatically create such nodes when the	device (e.g.
       an USB webcam) is plugged into the system, and has a name of the	kind
       /dev/videoN, where N is a number	associated to the device.

       Video4Linux2 devices usually support a limited set of widthxheight
       sizes and frame rates. You can check which are supported	using
       -list_formats all for Video4Linux2 devices.  Some devices, like TV
       cards, support one or more standards. It	is possible to list all	the
       supported standards using -list_standards all.

       The time	base for the timestamps	is 1 microsecond. Depending on the
       kernel version and configuration, the timestamps	may be derived from
       the real	time clock (origin at the Unix Epoch) or the monotonic clock
       (origin usually at boot time, unaffected	by NTP or manual changes to
       the clock). The -timestamps abs or -ts abs option can be	used to	force
       conversion into the real	time clock.

       Some usage examples of the video4linux2 device with ffmpeg and ffplay:

       o   List	supported formats for a	video4linux2 device:

		   ffplay -f video4linux2 -list_formats	all /dev/video0

       o   Grab	and show the input of a	video4linux2 device:

		   ffplay -f video4linux2 -framerate 30	-video_size hd720 /dev/video0

       o   Grab	and record the input of	a video4linux2 device, leave the frame
	   rate	and size as previously set:

		   ffmpeg -f video4linux2 -input_format	mjpeg -i /dev/video0 out.mpeg

       For more	information about Video4Linux, check <http://linuxtv.org/>.

       Options

       standard
	   Set the standard. Must be the name of a supported standard. To get
	   a list of the supported standards, use the list_standards option.

       channel
	   Set the input channel number. Default to -1,	which means using the
	   previously selected channel.

       video_size
	   Set the video frame size. The argument must be a string in the form
	   WIDTHxHEIGHT	or a valid size	abbreviation.

       pixel_format
	   Select the pixel format (only valid for raw video input).

       input_format
	   Set the preferred pixel format (for raw video) or a codec name.
	   This	option allows one to select the	input format, when several are
	   available.

       framerate
	   Set the preferred video frame rate.

       list_formats
	   List	available formats (supported pixel formats, codecs, and	frame
	   sizes) and exit.

	   Available values are:

	   all Show all	available (compressed and non-compressed) formats.

	   raw Show only raw video (non-compressed) formats.

	   compressed
	       Show only compressed formats.

       list_standards
	   List	supported standards and	exit.

	   Available values are:

	   all Show all	supported standards.

       timestamps, ts
	   Set type of timestamps for grabbed frames.

	   Available values are:

	   default
	       Use timestamps from the kernel.

	   abs Use absolute timestamps (wall clock).

	   mono2abs
	       Force conversion	from monotonic to absolute timestamps.

	   Default value is "default".

       use_libv4l2
	   Use libv4l2 (v4l-utils) conversion functions. Default is 0.

   vfwcap
       VfW (Video for Windows) capture input device.

       The filename passed as input is the capture driver number, ranging from
       0 to 9. You may use "list" as filename to print a list of drivers. Any
       other filename will be interpreted as device number 0.

       Options

       video_size
	   Set the video frame size.

       framerate
	   Set the grabbing frame rate.	Default	value is "ntsc", corresponding
	   to a	frame rate of "30000/1001".

   x11grab
       X11 video input device.

       To enable this input device during configuration	you need libxcb
       installed on your system. It will be automatically detected during
       configuration.

       This device allows one to capture a region of an	X11 display.

       The filename passed as input has	the syntax:

	       [<hostname>]:<display_number>.<screen_number>[+<x_offset>,<y_offset>]

       hostname:display_number.screen_number specifies the X11 display name of
       the screen to grab from.	hostname can be	omitted, and defaults to
       "localhost". The	environment variable DISPLAY contains the default
       display name.

       x_offset	and y_offset specify the offsets of the	grabbed	area with
       respect to the top-left border of the X11 screen. They default to 0.

       Check the X11 documentation (e.g. man X)	for more detailed information.

       Use the xdpyinfo	program	for getting basic information about the
       properties of your X11 display (e.g. grep for "name" or "dimensions").

       For example to grab from	:0.0 using ffmpeg:

	       ffmpeg -f x11grab -framerate 25 -video_size cif -i :0.0 out.mpg

       Grab at position	"10,20":

	       ffmpeg -f x11grab -framerate 25 -video_size cif -i :0.0+10,20 out.mpg

       Options

       draw_mouse
	   Specify whether to draw the mouse pointer. A	value of 0 specifies
	   not to draw the pointer. Default value is 1.

       follow_mouse
	   Make	the grabbed area follow	the mouse. The argument	can be
	   "centered" or a number of pixels PIXELS.

	   When	it is specified	with "centered", the grabbing region follows
	   the mouse pointer and keeps the pointer at the center of region;
	   otherwise, the region follows only when the mouse pointer reaches
	   within PIXELS (greater than zero) to	the edge of region.

	   For example:

		   ffmpeg -f x11grab -follow_mouse centered -framerate 25 -video_size cif -i :0.0 out.mpg

	   To follow only when the mouse pointer reaches within	100 pixels to
	   edge:

		   ffmpeg -f x11grab -follow_mouse 100 -framerate 25 -video_size cif -i	:0.0 out.mpg

       framerate
	   Set the grabbing frame rate.	Default	value is "ntsc", corresponding
	   to a	frame rate of "30000/1001".

       show_region
	   Show	grabbed	region on screen.

	   If show_region is specified with 1, then the	grabbing region	will
	   be indicated	on screen. With	this option, it	is easy	to know	what
	   is being grabbed if only a portion of the screen is grabbed.

       region_border
	   Set the region border thickness if -show_region 1 is	used.  Range
	   is 1	to 128 and default is 3	(XCB-based x11grab only).

	   For example:

		   ffmpeg -f x11grab -show_region 1 -framerate 25 -video_size cif -i :0.0+10,20	out.mpg

	   With	follow_mouse:

		   ffmpeg -f x11grab -follow_mouse centered -show_region 1 -framerate 25 -video_size cif -i :0.0 out.mpg

       video_size
	   Set the video frame size. Default value is "vga".

       grab_x
       grab_y
	   Set the grabbing region coordinates.	They are expressed as offset
	   from	the top	left corner of the X11 window and correspond to	the
	   x_offset and	y_offset parameters in the device name.	The default
	   value for both options is 0.

OUTPUT DEVICES
       Output devices are configured elements in FFmpeg	that can write
       multimedia data to an output device attached to your system.

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

       You can disable all the output devices using the	configure option
       "--disable-outdevs", and	selectively enable an output device using the
       option "--enable-outdev=OUTDEV",	or you can disable a particular	input
       device using the	option "--disable-outdev=OUTDEV".

       The option "-devices" of	the ff*	tools will display the list of enabled
       output devices.

       A description of	the currently available	output devices follows.

   alsa
       ALSA (Advanced Linux Sound Architecture)	output device.

       Examples

       o   Play	a file on default ALSA device:

		   ffmpeg -i INPUT -f alsa default

       o   Play	a file on soundcard 1, audio device 7:

		   ffmpeg -i INPUT -f alsa hw:1,7

   caca
       CACA output device.

       This output device allows one to	show a video stream in CACA window.
       Only one	CACA window is allowed per application,	so you can have	only
       one instance of this output device in an	application.

       To enable this output device you	need to	configure FFmpeg with
       "--enable-libcaca".  libcaca is a graphics library that outputs text
       instead of pixels.

       For more	information about libcaca, check:
       <http://caca.zoy.org/wiki/libcaca>

       Options

       window_title
	   Set the CACA	window title, if not specified default to the filename
	   specified for the output device.

       window_size
	   Set the CACA	window size, can be a string of	the form widthxheight
	   or a	video size abbreviation.  If not specified it defaults to the
	   size	of the input video.

       driver
	   Set display driver.

       algorithm
	   Set dithering algorithm. Dithering is necessary because the picture
	   being rendered has usually far more colours than the	available
	   palette.  The accepted values are listed with "-list_dither
	   algorithms".

       antialias
	   Set antialias method. Antialiasing smoothens	the rendered image and
	   avoids the commonly seen staircase effect.  The accepted values are
	   listed with "-list_dither antialiases".

       charset
	   Set which characters	are going to be	used when rendering text.  The
	   accepted values are listed with "-list_dither charsets".

       color
	   Set color to	be used	when rendering text.  The accepted values are
	   listed with "-list_dither colors".

       list_drivers
	   If set to true, print a list	of available drivers and exit.

       list_dither
	   List	available dither options related to the	argument.  The
	   argument must be one	of "algorithms", "antialiases",	"charsets",
	   "colors".

       Examples

       o   The following command shows the ffmpeg output is an CACA window,
	   forcing its size to 80x25:

		   ffmpeg -i INPUT -vcodec rawvideo -pix_fmt rgb24 -window_size	80x25 -f caca -

       o   Show	the list of available drivers and exit:

		   ffmpeg -i INPUT -pix_fmt rgb24 -f caca -list_drivers	true -

       o   Show	the list of available dither colors and	exit:

		   ffmpeg -i INPUT -pix_fmt rgb24 -f caca -list_dither colors -

   decklink
       The decklink output device provides playback capabilities for
       Blackmagic DeckLink devices.

       To enable this output device, you need the Blackmagic DeckLink SDK and
       you need	to configure with the appropriate "--extra-cflags" and
       "--extra-ldflags".  On Windows, you need	to run the IDL files through
       widl.

       DeckLink	is very	picky about the	formats	it supports. Pixel format is
       always uyvy422, framerate, field	order and video	size must be
       determined for your device with -list_formats 1.	Audio sample rate is
       always 48 kHz.

       Options

       list_devices
	   If set to true, print a list	of devices and exit.  Defaults to
	   false.

       list_formats
	   If set to true, print a list	of supported formats and exit.
	   Defaults to false.

       preroll
	   Amount of time to preroll video in seconds.	Defaults to 0.5.

       Examples

       o   List	output devices:

		   ffmpeg -i test.avi -f decklink -list_devices	1 dummy

       o   List	supported formats:

		   ffmpeg -i test.avi -f decklink -list_formats	1 'DeckLink Mini Monitor'

       o   Play	video clip:

		   ffmpeg -i test.avi -f decklink -pix_fmt uyvy422 'DeckLink Mini Monitor'

       o   Play	video clip with	non-standard framerate or video	size:

		   ffmpeg -i test.avi -f decklink -pix_fmt uyvy422 -s 720x486 -r 24000/1001 'DeckLink Mini Monitor'

   fbdev
       Linux framebuffer output	device.

       The Linux framebuffer is	a graphic hardware-independent abstraction
       layer to	show graphics on a computer monitor, typically on the console.
       It is accessed through a	file device node, usually /dev/fb0.

       For more	detailed information read the file
       Documentation/fb/framebuffer.txt	included in the	Linux source tree.

       Options

       xoffset
       yoffset
	   Set x/y coordinate of top left corner. Default is 0.

       Examples

       Play a file on framebuffer device /dev/fb0.  Required pixel format
       depends on current framebuffer settings.

	       ffmpeg -re -i INPUT -vcodec rawvideo -pix_fmt bgra -f fbdev /dev/fb0

       See also	<http://linux-fbdev.sourceforge.net/>, and fbset(1).

   opengl
       OpenGL output device.

       To enable this output device you	need to	configure FFmpeg with
       "--enable-opengl".

       This output device allows one to	render to OpenGL context.  Context may
       be provided by application or default SDL window	is created.

       When device renders to external context,	application must implement
       handlers	for following messages:	"AV_DEV_TO_APP_CREATE_WINDOW_BUFFER" -
       create OpenGL context on	current	thread.
       "AV_DEV_TO_APP_PREPARE_WINDOW_BUFFER" - make OpenGL context current.
       "AV_DEV_TO_APP_DISPLAY_WINDOW_BUFFER" - swap buffers.
       "AV_DEV_TO_APP_DESTROY_WINDOW_BUFFER" - destroy OpenGL context.
       Application is also required to inform a	device about current
       resolution by sending "AV_APP_TO_DEV_WINDOW_SIZE" message.

       Options

       background
	   Set background color. Black is a default.

       no_window
	   Disables default SDL	window when set	to non-zero value.
	   Application must provide OpenGL context and both "window_size_cb"
	   and "window_swap_buffers_cb"	callbacks when set.

       window_title
	   Set the SDL window title, if	not specified default to the filename
	   specified for the output device.  Ignored when no_window is set.

       window_size
	   Set preferred window	size, can be a string of the form widthxheight
	   or a	video size abbreviation.  If not specified it defaults to the
	   size	of the input video, downscaled according to the	aspect ratio.
	   Mostly usable when no_window	is not set.

       Examples

       Play a file on SDL window using OpenGL rendering:

	       ffmpeg  -i INPUT	-f opengl "window title"

   oss
       OSS (Open Sound System) output device.

   pulse
       PulseAudio output device.

       To enable this output device you	need to	configure FFmpeg with
       "--enable-libpulse".

       More information	about PulseAudio can be	found on
       <http://www.pulseaudio.org>

       Options

       server
	   Connect to a	specific PulseAudio server, specified by an IP
	   address.  Default server is used when not provided.

       name
	   Specify the application name	PulseAudio will	use when showing
	   active clients, by default it is the	"LIBAVFORMAT_IDENT" string.

       stream_name
	   Specify the stream name PulseAudio will use when showing active
	   streams, by default it is set to the	specified output name.

       device
	   Specify the device to use. Default device is	used when not
	   provided.  List of output devices can be obtained with command
	   pactl list sinks.

       buffer_size
       buffer_duration
	   Control the size and	duration of the	PulseAudio buffer. A small
	   buffer gives	more control, but requires more	frequent updates.

	   buffer_size specifies size in bytes while buffer_duration specifies
	   duration in milliseconds.

	   When	both options are provided then the highest value is used
	   (duration is	recalculated to	bytes using stream parameters).	If
	   they	are set	to 0 (which is default), the device will use the
	   default PulseAudio duration value. By default PulseAudio set	buffer
	   duration to around 2	seconds.

       prebuf
	   Specify pre-buffering size in bytes.	The server does	not start with
	   playback before at least prebuf bytes are available in the buffer.
	   By default this option is initialized to the	same value as
	   buffer_size or buffer_duration (whichever is	bigger).

       minreq
	   Specify minimum request size	in bytes. The server does not request
	   less	than minreq bytes from the client, instead waits until the
	   buffer is free enough to request more bytes at once.	It is
	   recommended to not set this option, which will initialize this to a
	   value that is deemed	sensible by the	server.

       Examples

       Play a file on default device on	default	server:

	       ffmpeg  -i INPUT	-f pulse "stream name"

   sdl
       SDL (Simple DirectMedia Layer) output device.

       This output device allows one to	show a video stream in an SDL window.
       Only one	SDL window is allowed per application, so you can have only
       one instance of this output device in an	application.

       To enable this output device you	need libsdl installed on your system
       when configuring	your build.

       For more	information about SDL, check: <http://www.libsdl.org/>

       Options

       window_title
	   Set the SDL window title, if	not specified default to the filename
	   specified for the output device.

       icon_title
	   Set the name	of the iconified SDL window, if	not specified it is
	   set to the same value of window_title.

       window_size
	   Set the SDL window size, can	be a string of the form	widthxheight
	   or a	video size abbreviation.  If not specified it defaults to the
	   size	of the input video, downscaled according to the	aspect ratio.

       window_fullscreen
	   Set fullscreen mode when non-zero value is provided.	 Default value
	   is zero.

       Interactive commands

       The window created by the device	can be controlled through the
       following interactive commands.

       q, ESC
	   Quit	the device immediately.

       Examples

       The following command shows the ffmpeg output is	an SDL window, forcing
       its size	to the qcif format:

	       ffmpeg -i INPUT -vcodec rawvideo	-pix_fmt yuv420p -window_size qcif -f sdl "SDL output"

   sndio
       sndio audio output device.

   xv
       XV (XVideo) output device.

       This output device allows one to	show a video stream in a X Window
       System window.

       Options

       display_name
	   Specify the hardware	display	name, which determines the display and
	   communications domain to be used.

	   The display name or DISPLAY environment variable can	be a string in
	   the format hostname[:number[.screen_number]].

	   hostname specifies the name of the host machine on which the
	   display is physically attached. number specifies the	number of the
	   display server on that host machine.	screen_number specifies	the
	   screen to be	used on	that server.

	   If unspecified, it defaults to the value of the DISPLAY environment
	   variable.

	   For example,	"dual-headed:0.1" would	specify	screen 1 of display 0
	   on the machine named	``dual-headed''.

	   Check the X11 specification for more	detailed information about the
	   display name	format.

       window_id
	   When	set to non-zero	value then device doesn't create new window,
	   but uses existing one with provided window_id. By default this
	   options is set to zero and device creates its own window.

       window_size
	   Set the created window size,	can be a string	of the form
	   widthxheight	or a video size	abbreviation. If not specified it
	   defaults to the size	of the input video.  Ignored when window_id is
	   set.

       window_x
       window_y
	   Set the X and Y window offsets for the created window. They are
	   both	set to 0 by default. The values	may be ignored by the window
	   manager.  Ignored when window_id is set.

       window_title
	   Set the window title, if not	specified default to the filename
	   specified for the output device. Ignored when window_id is set.

       For more	information about XVideo see <http://www.x.org/>.

       Examples

       o   Decode, display and encode video input with ffmpeg at the same
	   time:

		   ffmpeg -i INPUT OUTPUT -f xv	display

       o   Decode and display the input	video to multiple X11 windows:

		   ffmpeg -i INPUT -f xv normal	-vf negate -f xv negated

SEE ALSO
       ffmpeg(1), ffplay(1), ffprobe(1), ffserver(1), libavdevice(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-DEVICES(1)

NAME | DESCRIPTION | DEVICE OPTIONS | INPUT DEVICES | OUTPUT DEVICES | SEE ALSO | AUTHORS

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