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)
