lav2yuv(1) [suse man page]

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 Linux Square						   6 March 2002 							lav2yuv(1)

yuvmedianfilter(1)						MJPEG tools manual						yuvmedianfilter(1)

NAME

       yuvmedianfilter - A filter for yuv images produced by the mjpeg tools

SYNOPSIS

       yuvmedianfilter [-r num] [-R num] [-t num] [-T num] [-I num] [-f] [-w num] [-s num] [-v num] [-h]

DESCRIPTION

       yuvmedianfilter is designed to enhance/filter images.  It takes the input from STDIN and writes output to STDOUT.
       This filter looks around the current point for a radius and averages the values that fall inside a threshold.  So the image is softened and
       the edges become more sharp. If the input material is noisy (it is always noisy but you do  not	always	see  it)  the  output  images  are
       improved  and  the  encoder spends less bandwidth encoding noise.  The more sophisticated version of image filtering is yuvdenoise. But you
       can use both programs in the encoding procces.  It cannot process a recorded file and write the improved version to another file.

OPTIONS

       yuvmedianfilter accepts the following options:

       -r num
	    Radius for luma median (default: 2 pixels)

       -R num
	    Radius for chroma median (default: 2 pixels)

       -t num
	    Trigger threshold for luma (default: 2 [0=disable])

       -T num
	    Trigger threshold for chroma (default: 2 [0=disable])

       -I num
	    Interlacing type (0=no, 1=yes, default: taken from yuv stream)

       -f   Fast mode, i.e. the threshold is ignored, and a simple mean of the surrounding values is calculated.

       -w num
	    In fast mode, the weight given to the current value versus the surrounding values.	Default is 8.
	    Note that certain combinations of radii and weights have been optimized to be even faster -- radius 1 and weight 2.667, radius  1  and
	    weight 8, and radius 2 and weight 8.

       -c num
	    In	slow  mode, more than this fraction of the pixels must be within the threshold; otherwise the pixel is simply the weighted mean of
	    pixels within a radius of 1.  Default is 0.33333.

       -s num
	    Number of beginning frames to skip.  The first num frames are written to stdout unfiltered.  This is useful  for  resuming	an  inter-
	    rupted job without having to duplicate work.

       -v num
	    Verbosity level (0, 1 or 2)

       -h   Print out a help message

BUGS

       It is slow.  Using a radius greater than the default of 2 is painfully slow.

AUTHOR

       This man page was written by Bernhard Praschinger.
       The yuvmedianfilter program was written by Mike Bernson, and adapted to the yuv4mpeg2 stream header format by Steven M. Schultz.

       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), jpeg2yuv(1), lav2yuv(1), mpeg2enc(1), ppmtoy4m(1), yuv2lav(1), yuvdenoise(1), yuvscaler(1)

MJPEG Linux Square						 24 February 2003						yuvmedianfilter(1)