pgmtoy4m(1)                   MJPEG tools manual                   pgmtoy4m(1)

نام (NAME)
       pgmtoy4m - Convert mpeg2dec pgm and pgmpipe output to YUV4MPEG2

خلاصه دستور (SYNOPSIS)
       pgmtoy4m [options]

توضیحات (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.

گزینه‌ها (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)

مثال‌ها (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

نکات (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!

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

اشکالات (BUGS)
       Possible but none known at the present time.

y4mutils                       16 December 2003                    pgmtoy4m(1)