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yuv2lav(1)		      MJPEG tools manual		    yuv2lav(1)

       yuv2lav - encodes lavtool's raw YUV frame streams into MJPEG files

       yuv2lav	[-f a|A|q|m]  [-q num] [-b num]	[-I num] [-m num] [-v num] [-w
       file] -o	output-file

       yuv2lav is a simple MJPEG encoder for raw YUV frame streams as they are
       emitted	by  lav2yuv(1)	or lavpipe(1), for example. It reads its input
       from stdin and is capable of writing AVI	and Quicktime.

       The command line	options	allow to specify the output  file  name,  JPEG
       encoding	 quality  and  the amount of memory that will be allocated for
       JPEG compressed data.

       -o output-file
	      This (compulsorary) option  sets	the  name  of  the  file  that
	      yuv2lav  will write its output to. If the	output file contains a
	      %	(e.g. file%02d.avi), the output	will be	 written  to  multiple
	      files  in	 case this is necessary	(file00.avi, file01.avi	and so

       -f a|A|q
	      This sets	the output file	format,	which has to be	one of
	       a - for AVI file	output,
	       A - for AVI with	reversed fields,
	       q - for Quicktime output	or
	      AVI with reversed	field of course	only makes sense if  yuv2lav's
	      feed  is an interlaced video source and should only be needed if
	      you experience frame reversal problems in	your output.   If  you
	      don't  use that option yuv2lav will set the output format	to AVI
	      if the last 3 char are avi, or to	Quicktime if you use  mov.  If
	      you use the -f option it overides	the setting in the filename

       -q num This  option  specifies  the  JPEG  encoding  quality  as	passed
	      through to libjpeg. The default value is 80, num must lie	within
	      24...100	inclusive  (think of it	as percentage values, although
	      with a lossy compression algorithm like JPEG,  keeping  100%  of
	      the original quality is of course	not really possible).

       -b num This  option  specifies  the size	of the buffer (in kBytes) that
	      yuv2lav allocates	in order to store the compressed JPEG data  in
	      it.  The default value (256k) is perfectly enough	for 100% qual-
	      ity full sized PAL/NTSC, but if you want to compress Super-Mega-
	      HDTV  or	if  you	 are low on memory, you	can use	this option to
	      suit your	needs.

       -m num This is the maximum size (in MB) per file. Normally this depends
	      on the output file type.

       -I num Force  a	specific  interlacing  type. 0 means no	interlacing, 1
	      means top-field-first, 2 means bottom-field-first.

       -w file
	      This is the WAV file containing audio data to be	combined  with
	      the video	stream into the	output file.

       -v num Verbosity	 level.	 0  means  only	print error messages, 2	prints
	      full debug output.

       -?     Display a	synopsis of the	command	syntax.

       lav2yuv movie.avi | yuv2lav -fq -q 30 lowbitrate.qt
	      would recompress movie.avi as a low bit rate Quicktime file.

       lavpipe input.pli | yuv2lav -q80	output.avi
	      would save the movie assembled by	lavpipe	as a single AVI	file.

       If you experience any problems with this	tool, please feel free to con-
       tact the	developers (see	below).

       This man	page was written by pHilipp Zabel.
       If  you	have  questions, remarks, problems or you just want to contact
       the developers, the main	mailing	list for the MJPEG-tools is:
       For more	info, see our website at

       lav2yuv(1),  lavpipe(1),	 lavplay(1),  lavrec(1),  mpeg2enc(1),	 yuvs-

MJPEG Tools Team		  2 June 2001			    yuv2lav(1)


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