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OGMMERGE(1)			 User Commands			   OGMMERGE(1)

NAME
       ogmmerge	- Merge	multimedia streams into	an OGG/OGM file

SYNOPSIS
       ogmmerge	 [global  options] -o out [options] <file1> [[options] <file2>
       ...]

DESCRIPTION
       This program takes the input from several media files and  joins	 their
       streams (all of them or just a selection) into an OGM.  It was formerly
       known as	'oggmerge' and is based	on  the	 'oggmerge'  CVS  module  from
       Xiph's repository (<http://www.xiph.org/>).  <http://www.xiph.org/>

       Global options:

       -v, --verbose
	      Increase verbosity.

       -q, --quiet
	      Suppress status output.

       -o, --output out
	      Write to the file	'out'.

       Options that can	be used	for each input file:

       -a, --astreams <n,m,...>
	      Copy  the	 n'th audio stream, NOT	the stream with	the serial no.
	      n.  Default: copy	all audio streams.

       -d, --vstreams <n,m,...>
	      Copy the n'th video stream, NOT the stream with the  serial  no.
	      n.  Default: copy	all video streams.

       -t, --tstreams <n,m,...>
	      Copy the n'th text stream, NOT the stream	with the serial	no. n.
	      Default: copy all	text streams.

       -A, --noaudio
	      Don't copy any audio stream from this file.

       -D, --novideo
	      Don't copy any video stream from this file.

       -T, --notext
	      Don't copy any text stream from this file.

       -s, --sync <d[,o[/p]]>
	      Synchronize manually, delay the audio stream by d	ms.
	      d	> 0: Pad with silent samples.
	      d	< 0: Remove samples from the beginning.
	      o/p: adjust the timestamps by o/p	to fix linear  drifts.	p  de-
	      faults  to  1000	if omitted. Both o and p can be	floating point
	      numbers.
	      Defaults:	no manual synch	correction (which is the same as d = 0
	      and o/p =	1.0).

       -r, --range <start-end>
	      Only  process  from  start  to  end.  Both  values take the form
	      'HH:MM:SS.mmm' or	'SS.mmm', e.g. '00:01:00.500' or '60.500'.  If
	      one  of  start or	end is omitted then it defaults	to 0 or	to end
	      of the file respectively.
	      If you want to split a file into smaller ones I strongly suggest
	      you  use	ogmsplit(1)  as	it can do a much better	job than using
	      the -r option.

       -c, --comment 'A=B#C=D' or '@filename'
	      Set additional comment fields for	the streams. Sensitive	values
	      would  be	 'LANGUAGE=English' or 'TITLE=Ally McBeal'. If the pa-
	      rameter starts with '@' then the comments	will be	 read  from  a
	      file with	the same name without the leading '@'. -c can be spec-
	      ified multiple times per file. The comments will all be concate-
	      nated.

       -f, --fourcc <FourCC>
	      Forces  the  FourCC to the specified value. Works	only for video
	      streams. Note that you cannot simply use a hex editor and	change
	      the  FourCC  by hand as the OGG file format uses checksums which
	      would be wrong after such	a change.

       --omit-empty-packets
	      Normally,	when a subtitle	entry  should  be  removed,  an	 empty
	      packet  is  created and inserted with the	appropriate timestamp.
	      With this	option these empty packets are omitted completely.

       --old-headers
	      Assume that the input file has been created with an  older  ver-
	      sion of ogmmerge ( < 1.1). This may be needed if ogmmerge	cannot
	      read such	a file correctly.

       --nav-seek <filename>
	      Use an external AVI index	file as	generated by aviindex from the
	      transcode	 package.  Can be used if an AVI file has a broken in-
	      dex.

       Other options:

       -l, --list-types
	      List supported input file	types.

       -h, --help
	      Show usage information.

       -V, --version
	      Show version information.

USAGE
       For each	file the user can select which tracks  ogmmerge	 should	 take.
       They  are  all  put  into the file specified with '-o'. A list of known
       (and supported) source formats can be obtained with the '-l' option.

EXAMPLES
       Let's assume you	have a file called MyMovie.avi and the audio track  in
       a  separate  file, e.g. MyMovie.wav. First you want to encode the audio
       to OGG:

       $ oggenc	-q4 -oMyMovie.ogg MyMovie.wav

       After a couple of minutes you can join video and	audio:

       $ ogmmerge -o MyMovie-with-sound.ogm MyMovie.avi	MyMovie.ogg

       If your AVI already contains an audio track  then  it  will  be	copied
       aswell (if ogmmerge supports the	audio format). To avoid	that simply do

       $ ogmmerge -o MyMovie-with-sound.ogm -A MyMovie.avi MyMovie.ogg

       After  some  minutes of consideration you rip another audio track, e.g.
       the director's comments or another language  to	MyMovie-add-audio.wav.
       Encode it again and join	it up with the other file:

       $ oggenc	-q4 -oMyMovie-add-audio.ogg MyMovie-add-audio.wav
       $  ogmmerge  -o	MM-complete.ogm	MyMovie-with-sound.ogm MyMovie-add-au-
       dio.ogg

       The same	result can be achieved with

       $ ogmmerge -o MM-complete.ogm -A	MyMovie.avi MyMovie.ogg	\
	 MyMovie-add-audio.ogg

       Now fire	up mplayer and enjoy. If you have multiple  audio  tracks  (or
       even  video  tracks) then you can tell mplayer which track to play with
       the '-vid' and '-aid' parameters. These are 0-based and do not  distin-
       guish between video and audio.

       If you need an audio track synchronized you can do that easily with

       $ ogmmerge -o goodsync.ogm -A source.avi	-s 200 outofsync.ogg

       This  would  add	 200ms of silence at the beginning of the audio	tracks
       taken from outofsync.ogg. And -s	always applies to all audio tracks  in
       a  source  file.	 If you	want to	apply -s only to a specific track then
       take the	same source file more than once	and add	-a and -s accordingly.

       Some movies start synced	correctly but slowly drift out	of  sync.  For
       these  kind of movies you can specify a delay factor that is applied to
       all timestamps -	no data	is added or removed. So	if you make that  fac-
       tor  too	big or too small you'll	get bad	results. An example is that an
       episode I transcoded was	0.2 seconds out	of sync	 at  the  end  of  the
       movie  which  was 77340 frames long. At 29.97fps	0.2 seconds correspond
       to approx. 6 frames. So I did

       $ ogmmerge -o goodsync.ogm -s 0,77346/77340 outofsync.ogm

       The result was fine.

       The sync	options	can also be used for subtitles in the same manner.

       For text	subtitles you can either use some Windows software (like  Sub-
       Ripper)	or the subrip package found in transcode(1)'s sources (in con-
       trib/subrip). The general process is:

       1.     extract a	raw subtitle stream from the source:
	      $	tccat -i /path/to/copied/dvd/ -T 1 -L |	\
		  tcextract -x ps1 -t vob -a 0x20 | \
		  subtitle2pgm -o mymovie

       2.     convert the resulting PGM	images to text with gocr:
	      $	pgm2txt	mymovie

       3.     spell-check the resulting	text files:
	      $	ispell -d american *txt

       4.     convert the text files to	a SRT file:
	      $	srttool	-s -w -i mymovie.srtx -o mymovie.srt

       The resulting file can be used as another input file for	ogmmerge:

       $ ogmmerge -o mymovie.ogm -c 'TITLE=My Movie' mymovie.avi \
	   -c LANGUAGE=English mymovie.ogg -c LANGUAGE=English mymovie.srt

FILE SIZE
       Using OGG as the	container format introduces overhead - each OGG	packet
       has a header, and each OGG packet can span one or more OGG pages, which
       itself again contain headers. Several tests show	that the  overhead  is
       bigger  than the	overhead introduced by AVI (comparing video only files
       and files with video and	MP3 audio).

       The overhead is defined as file	size  -	 raw  stream  size.   mencoder
       prints  the  raw	 stream	 size after encoding, so you'll	be able	to get
       that information	rather easily.

       Most of the times you want to calculate the overhead prior to  encoding
       in  order to adjust the bitrate accordingly. Unfortunately the overhead
       per frame is not	constant - only	the percentage is constant. This  per-
       centage	is  calculated	as  100	* (OGG size - raw size)	/ raw size and
       seems to	be somewhere between 1.1% and 1.2%. This depends on the	number
       of streams and the stream types used.

       The raw size itself can be approximated by
		    frames * vbitrate
       raw size	= ( -----------------  + length	* abitrate ) / 8 * 1000	* 1024
		     frames per	sec
       assuming	 that  vbitrate	and abitrate are given in kbit/s = 1000	bit/s,
       and length is given in seconds.

NOTES
       What works:

       *      AVI as the video and audio source	(currently only	raw  PCM,  MP3
	      and AC3 audio tracks)

       *      OGG as the source	for video, audio (Vorbis, raw PCM, MP3 and AC3
	      audio) and text streams (subtitles).

       *      WAV as the audio source

       *      MP3 audio	files

       *      AC3 audio	files

       *      Track selection

       *      Manual audio synchronization by adding silence/removing  packets
	      for  Vorbis audio	and for	text streams by	adjusting the starting
	      point and	duration.

       *      Manual audio synchronization for AC3 and MP3 audio by  duplicat-
	      ing/removing packets at the beginning.

       *      Adding  user comments to the mandatory comment headers (only the
	      headers are mandatory. Comments themselves are not mandatory.)

       *      Text subtitles can be read from SRT (SubRipper / subrip) and Mi-
	      croDVD files or taken from other OGM files.

       *      PCM,  AC3	and MP3	audio work well	under Windows and with MPlayer
	      now.

       *      Chapter information as generated by dvdxchap are supported.

       What not	works:

       *      Manual audio synchronization for PCM sound (who  needs  it  any-
	      way?)

       Planned functionality:

       *      support for other	subtitle formats

CHAPTERS
       ogmmerge	supports chapter information as	generated by dvdxchap(1).  The
       format is very simple:

       CHAPTER01=HH:MM:SS.sss
       CHAPTER01NAME=the first chapter
       CHAPTER02=HH:MM:SS.sss
       CHAPTER02NAME=another chapter

       with HH = hour, MM = minute, SS = seconds, sss =	milliseconds.

       The chapter information is  stored  in  the  video  stream's  comments.
       Therefore you could also	specify	the chapters with -c CHAPTER01=... Us-
       ing a chapter file has an advantage: If the video stream's comments al-
       ready contain chapter information and the command line contains a chap-
       ter information file then the existing chapter information will be com-
       pletely replaced.

TECHNICAL ASPECTS
       This section is not needed by the average user.

       ogmmerge	consists of three parts:

       *      Demultiplexers (called readers) open and read input files	speci-
	      fied on the command line and extract specific tracks.

       *      Packetizers (or output modules) take data	from  a	 demultiplexer
	      and encapsulate them into	OGG pages. These are stored in queues.

       *      The main program requests	from every known demultiplexer that it
	      should read some data. It	then gets the OGG page with the	small-
	      est timestamp from all the packetizer queues. This page is writ-
	      ten to the output	file.

       The general class definitions for the readers and the  packetizers  can
       be found	in ogmmerge.h.

       The  main  loop expects that the	queues managed by the demuxer's	packe-
       tizers are filled with at least one page	after a	call to	the  demuxer's
       read()  function. The demuxer must make sure that enough	data is	passed
       to each of its associated packetizers. Have a look at r_ogm.cpp.

       A possible setup	might look like	this:

			       +->  p_video
		  +->  r_avi  -+
		  |	       +->  p_pcm
		  |
       ogmmerge	 -+->  r_ogm  --->  p_vorbis
		  |
		  |	       +->  p_video
		  |	       |
		  +->  r_ogm  -+->  p_vorbis
			       |
			       +->  p_vorbis

       One AVI source with a video and an audio	track, one OGG/OGM source with
       only one	Vorbis track, another OGG/OGM source with a video and two Vor-
       bis tracks.

AUTHOR
       ogmmerge	was written by Moritz Bunkus <moritz@bunkus.org>.

SEE ALSO
       ogmdemux(1), ogmsplit(1), ogminfo(1), ogmcat(1),	dvdxchap(1)

WWW
       The     newest	  version     can     always	 be	 found	    at
       <http://www.bunkus.org/videotools/ogmtools/>
       <http://www.bunkus.org/videotools/ogmtools/>

ogmmerge v1.5			 November 2004			   OGMMERGE(1)

NAME | SYNOPSIS | DESCRIPTION | USAGE | EXAMPLES | FILE SIZE | NOTES | CHAPTERS | TECHNICAL ASPECTS | AUTHOR | SEE ALSO | WWW

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