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lav2yuv(1)                    MJPEG tools manual                    lav2yuv(1)


NAME

       lav2yuv - Convert a MJPEG file to raw yuv


SYNOPSIS

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


DESCRIPTION

       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
       possible.

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


OPTIONS

       lav2yuv accepts the following options:

       -m   Force mono-chrome

       -c   Conceal frames containing corrupt MJPEG data by repeating the
            preceeding 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
            negative all but the last num frames are skipped

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

       -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'
            (corresponding 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
            editing.


AUTHOR

       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:
         mjpeg-users@lists.sourceforge.net

       For more info, see our website at
              http://mjpeg.sourceforge.net


SEE ALSO

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

MJPEG Tools Team                 6 March 2002                       lav2yuv(1)

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