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png2yuv(1)		      MJPEG tools manual		    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 file‐
       name]

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 descrip‐
	    tion 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 work‐
       around specify a PAL (25) or native FILM (24) and set the  right	 frame
       rate in mpeg2enc with the -F option.  Interlaced handling is not imple‐
       mented 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 Linux Square		2 February 2003			    png2yuv(1)
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