NAME

       png2yuv - Convert PNG images to the YUV4MPEG stream format.

SYNOPSIS

       png2yuv [-b num] [-f num] [-I num] [-L num] [-n num] [-l num] [-j filename]

DESCRIPTION

       png2yuv  decompresses  a  sequence of PNG files and pipes the image data to stdout as a YUV4MPEG2 stream.
       Any 8bit/pixel PNG format supported by libpng can be read.  stdout will be filled with the YUV4MPEG movie
       data stream, so be prepared to pipe it on to mpeg2enc or to write it into a file.

       This tool is incomplete.  The alternative utility you are probably looking for is ppmtoy4m(1),  which  is
       also included in MJPEGtools.

OPTIONS

       png2yuv 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. Not default, this option has to be specified.

       -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-interleaved (two successive fields per PNG file)
            1 = interleaved fields

       -l num
            Specifies the number of loops (default: 0 loops )

       -S samp_mode
            chroma  subsampling  mode,  only  for professionals, for more info see ppmtoy4m and the YUV guide on
            http://www.mir.com/DMG/.
            default: 420_jpeg
            When this option is not used the given range of images is only  processed  once.  If  you  use  this
            option and as number 1, jpeg2yv will loop forever writing the image to stdout. When you use n > 1 it
            will loop. n-time till it finishes.

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

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

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

BUGS

       The frame rate description does not seem to be up to date. The NTSC integer ratios are not supported (use
       floating point instead). As workaround specify a PAL (25) or native FILM (24) and  set  the  right  frame
       rate in mpeg2enc with the -F option.  Interlaced handling is not implemented yet.

AUTHOR

       This man page was written by Gernot Ziegler.
       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 Tools Team                                 2 February 2003                                      png2yuv(1)