Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages


home | help
lav2yuv(1)		      MJPEG tools manual		    lav2yuv(1)

       lav2yuv - Convert a MJPEG file to raw yuv

       lav2yuv [options] lavfile1 [lavfile2 ...	lavfileN]

       lav2yuv	converts  an  MJPEG  video sequence described by a sequence of
       MJPEG video files and/or	edit lists pointing to	such  files  into  the
       simple  uncompressed planar 4:2:0 Y'CbCr	format,	as used	by mpeg2enc(1)
       MPEG  encoder  and  image  processing  filters  like  yuvscaler(1)   or
       yuv2dfilter(1) or yuvdenoise(1).

       Output  is  to  stdout  so  that	by piping the output of	lav2yuv	into a
       suitable	pipeline it is possible	to process and	then  encode  or  play
       back  video  recorded in	any of the mjpegtools MJPEG container formats:
       AVI, quicktime or edit lists describing editted versions	of video  held
       in such files.

       Mixing  different  files	 with different	video formats is currently not

       The -S -T -D options are	used for scene	detection  which  is  used  by
       linux video studio.

       lav2yuv accepts the following options:

       -m   Force mono-chrome

       -c   Conceal frames containing corrupt MJPEG data by repeating the pre-
	    ceeding good frame.

       -S list.el
	    Output a scene list	with scene detection

       -T num
	    Set	scene detection	threshold to num (default: 4)

       -D num
	    Width decimation to	use for	scene detection	(default: 2)

       -o num
	    Frame offset - skip	num frames at the beginning.  if num is	 nega-
	    tive all but the last num frames are skipped

       -f num
	    Only num frames are	written	to stdout. 0 means that	all frames are

       -A width:height
	    Set/override the sample aspect ratio (SAR) emitted in  the	output
	    stream  header.   Currently,  the SAR is only auto-detected	for DV
	    files, and guessed otherwise.

       -P width:height
	    Set	the intended/approximate display aspect	ratio  (DAR)  for  the
	    stream.   This  value is only used to guess	the SAR	when it	cannot
	    be detected	from the input stream.	The default DAR	is '4:3' (cor-
	    responding	to  a  standard	 TV  screen);  another useful value is
	    '16:9' (corresponding to widescreen	TV).

       -C chroma
	    Set	output chroma  (default:  '420jpeg').	Currently,  '420jpeg',
	    '420mpeg2',	'420paldv', '422' are available.

       -x   Exchange  fields.	Useful	if the field order was reversed	during

       This man	page was originally written by Bernhard	Praschinger.
       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

       mjpegtools(1),  mpeg2enc(1),  yuvscaler(1),  yuv2lav(1),	yuvdenoise(1),

MJPEG Tools Team		 6 March 2002			    lav2yuv(1)


Want to link to this manual page? Use this URL:

home | help