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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
   sample 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.



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