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jpeg2yuv(1) [debian 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)

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yuvmedianfilter(1)						MJPEG tools manual						yuvmedianfilter(1)

NAME
yuvmedianfilter - A filter for yuv images produced by the mjpeg tools SYNOPSIS
yuvmedianfilter [-r num] [-R num] [-t num] [-T num] [-I num] [-f] [-w num] [-s num] [-v num] [-h] DESCRIPTION
yuvmedianfilter is designed to enhance/filter images. It takes the input from STDIN and writes output to STDOUT. This filter looks around the current point for a radius and averages the values that fall inside a threshold. So the image is softened and the edges become more sharp. If the input material is noisy (it is always noisy but you do not always see it) the output images are improved and the encoder spends less bandwidth encoding noise. The more sophisticated version of image filtering is yuvdenoise. But you can use both programs in the encoding procces. It cannot process a recorded file and write the improved version to another file. OPTIONS
yuvmedianfilter accepts the following options: -r num Radius for luma median (default: 2 pixels) -R num Radius for chroma median (default: 2 pixels) -t num Trigger threshold for luma (default: 2 [0=disable]) -T num Trigger threshold for chroma (default: 2 [0=disable]) -I num Interlacing type (0=no, 1=yes, default: taken from yuv stream) -f Fast mode, i.e. the threshold is ignored, and a simple mean of the surrounding values is calculated. -w num In fast mode, the weight given to the current value versus the surrounding values. Default is 8. Note that certain combinations of radii and weights have been optimized to be even faster -- radius 1 and weight 2.667, radius 1 and weight 8, and radius 2 and weight 8. -c num In slow mode, more than this fraction of the pixels must be within the threshold; otherwise the pixel is simply the weighted mean of pixels within a radius of 1. Default is 0.33333. -s num Number of beginning frames to skip. The first num frames are written to stdout unfiltered. This is useful for resuming an inter- rupted job without having to duplicate work. -v num Verbosity level (0, 1 or 2) -h Print out a help message BUGS
It is slow. Using a radius greater than the default of 2 is painfully slow. AUTHOR
This man page was written by Bernhard Praschinger. The yuvmedianfilter program was written by Mike Bernson, and adapted to the yuv4mpeg2 stream header format by Steven M. Schultz. 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), jpeg2yuv(1), lav2yuv(1), mpeg2enc(1), ppmtoy4m(1), yuv2lav(1), yuvdenoise(1), yuvscaler(1) MJPEG Linux Square 24 February 2003 yuvmedianfilter(1)
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