jpeg2yuv(1)							MJPEG tools manual						       jpeg2yuv(1)

NAME

       jpeg2yuv - Convert jpeg images to the yuv format.

SYNOPSIS

       jpeg2yuv [-b num] [-f num] [-I num] [-A ratio] [-L num] [-n num] [-l num] [-j filename]

DESCRIPTION

       jpeg2yuv decompresses a sequence of JPEG files and pipes the image data to stdout as a YUV4MPEG2 stream.  Any JPEG format supported by lib-
       jpeg can be read.  stdout will be filled with the YUV4MPEG2 movie data stream, so be prepared to pipe it on to mpeg2enc or to write it into
       a file.

OPTIONS

       jpeg2yuv accepts the following options:

       -b num
	    Frame offset:  skip output of the first 'num' frames.  (default: 0)

       -f num
	    Set the frame rate of stream accepts the same numbers.  No default, this option has to be specified.

       -A ratio
	    Sample aspect ratio.  Default is square pixels (1:1)

       -I num
	    interlacing mode: p = none / progressive
	    t = top field first
	    b = bottom field first
	    No default, this option has to be specified.

       -L num
	    0 = non-interlaced (two successive fields per JPEG file)
	    1 = interlaced fields

       -l num
	    Specifies the number of loops (default: 0 loops )
	    When  this	option	is  not used the given range of images is only processed once. If you use this option with num of -1 jpeg2yuv will
	    loop forever writing the image to stdout. When you use n > 0 it will loop n-times till it finishes.

       -n num
	    Specifies the number of frames to process. (default: all = -1)

       -j {1}%{2}d{3}
	    Read JPEG frames with the name components as follows:
	     {1} JPEG filename prefix (e g: picture_ )
	     {2} Counting placeholder (like in C, printf, eg 06 ))
	     {3} File extension. Something like this: .jpg A correct description of the files could look like this: picture_%06d.jpg

	    If this option is omited, the filenames are read from stdin. For example:
	     $ls *jpg | jpeg2yuv -f 25 -I p > result.yuv

       -R 1 or 0
	    rescale YUV color values from 0-255 to 16-235 (default: 1)

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

BUGS

       The frame rate description seems not to be up to date. The NTSC integer ratios seem not to be supported. As a workaround specify a PAL (25)
       or FILM (24) and set the right frame rate in mpeg2enc with the -F option.

AUTHOR

       This man page was 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), ppmtoy4m(1), yuv2lav(1), yuvdenoise(1), yuvmedianfilter(1), yuvscaler(1)

MJPEG Linux Square						  8 December 2001						       jpeg2yuv(1)