png2yuv(1)


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)





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