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)