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pgmtoy4m(1)		      MJPEG tools manual		   pgmtoy4m(1)

NAME
       pgmtoy4m	- Convert mpeg2dec pgm and pgmpipe output to YUV4MPEG2

SYNOPSIS
       pgmtoy4m	[options]

DESCRIPTION
       pgmtoy4m	 repacks  the  PGM output from mpeg2dec	into YUV4MPEG2 4:2:0p.
       No actual changes to the	data are made.	The data is unpacked from  the
       quasi-PGM format	and placed in YUV4MPEG2	format with the	specified sam-
       ple aspect, frame rate and field	order.	Output must  be	 either	 to  a
       pipe  or	 a file, leaving stdout	as a terminal will elicit an error and
       the program will	exit.

OPTIONS
       pgmtoy4m	accepts	the following options:

       -v num
	    Set	verbosity level.  (default: 0)

       -h   Print a usage summary and exit.

       -i t|b|p
	    Set	the interlacing	mode.  Top field first (t), bottom field first
	    (b)	or progressive/none (p).  (default: t)

       -a sar
	    Set	the sample aspect ratio.  (default: 10:11)

       -r frame	rate
	    Set	the frame rate.	 (default: 30000:1001)

EXAMPLES
       mpeg2dec	-s -o pgmpipe file.mpg | pgmtoy4m -a 10:11 -r 24000:1001 -i b |	yuvplay

       mpeg2dec	-s -o pgm file.mpg
       cat *.pgm | pgmtoy4m -r 30000:1001 -i t | yuvplay

NOTES
       This  program  is  specifically	designed  to  work  with the output of
       mpeg2dec	and is NOT a general PGM (NetPBM) tool!

       From the	introduction in	the source file:

	* Note:	mpeg2dec uses a	variation of the PGM format - they're really not
	* "Grey	Maps" but rather a catenation of the 420P data (commonly called
	* "YUV").    The type is P5 ("raw") and	the number of rows is really
	* the total of the Y', Cb and Cr heights.   The	Cb and Cr data is "joined"
	* together.  After the Y' rows you have	1 row of Cb and	1 row of Cr per
	* "row"	of PGM data.

	* NOTE:	You MAY	need to	know the field order (top/bottom field first),
	*      sample aspect ratio and frame rate because the PGM format makes
	*      none of that information	available!

AUTHOR
       This manpage was	written	by Steven Schultz (sms at 2bsd dot com).

BUGS
       Possible	but none known at the present time.

y4mutils		       16 December 2003			   pgmtoy4m(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLES | NOTES | AUTHOR | BUGS

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