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 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.
MJPEG Linux Square 16 December 2003 pgmtoy4m(1)
Check Out this Related Man Page
jpeg2yuv(1) MJPEG tools manual jpeg2yuv(1)NAME
jpeg2yuv - Convert jpeg images to the yuv format.
SYNOPSIS
jpeg2yuv [-b num] [-f num] [-I num] [-A ratio] [-L num] [-n num] [-l num] [-j filename]
DESCRIPTION
jpeg2yuv decompresses a sequence of JPEG files and pipes the image data to stdout as a YUV4MPEG2 stream. Any JPEG format supported by lib-
jpeg can be read. stdout will be filled with the YUV4MPEG2 movie data stream, so be prepared to pipe it on to mpeg2enc or to write it into
a file.
OPTIONS
jpeg2yuv 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. No default, this option has to be specified.
-A ratio
Sample aspect ratio. Default is square pixels (1:1)
-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-interlaced (two successive fields per JPEG file)
1 = interlaced fields
-l num
Specifies the number of loops (default: 0 loops )
When this option is not used the given range of images is only processed once. If you use this option with num of -1 jpeg2yuv will
loop forever writing the image to stdout. When you use n > 0 it will loop n-times till it finishes.
-n num
Specifies the number of frames to process. (default: all = -1)
-j {1}%{2}d{3}
Read JPEG frames with the name components as follows:
{1} JPEG filename prefix (e g: picture_ )
{2} Counting placeholder (like in C, printf, eg 06 ))
{3} File extension. Something like this: .jpg A correct description of the files could look like this: picture_%06d.jpg
If this option is omited, the filenames are read from stdin. For example:
$ls *jpg | jpeg2yuv -f 25 -I p > result.yuv
-R 1 or 0
rescale YUV color values from 0-255 to 16-235 (default: 1)
-v num
Verbosity level (0, 1 or 2)
BUGS
The frame rate description seems not to be up to date. The NTSC integer ratios seem not to be supported. As a workaround specify a PAL (25)
or FILM (24) and set the right frame rate in mpeg2enc with the -F option.
AUTHOR
This man page was written by Bernhard Praschinger.
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 8 December 2001 jpeg2yuv(1)