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Title:          resizer-yuv
Version:        0.4
Entered-date:   2002-10-29
Description:    'resizer-yuv' for use with mjpegtools.
                Designed to convert 720x576 DVB-s PAL satellite TV mpg to
                CVD 352x576. (D2) (for video CDs playable in DVD players).
                This resizes video, without the artifacts (aliasing
                effects) that yuvscaler causes. 
                I took this code from transcode bbmpeg resize.c, and gave
                it an yuv interface conform mjpegtools.
                Also I used low pass pre-filtering using fft followed by
                reverse fft, to prevent aliasing in the high frequency range.
                This uses the very cool fft fftw-2.1.3.tar.gz library from:
                http://www.fftw.org/download.html
                Use the version best suited for your processor.
                resizer-yuv will run tests to find out the best fft algo if
                you specify the -m flag on the command line.
                To unpack:
                tar -zxvf resizer-yuv-0.4.tgz
                cd resizer-yuv-0.4
                Then follow the instructions in README.
                Tested with 720 x 576 to 352 x 576
                Documentation: read the provided README.
                Changes:
                0.4:
                Dropped most command line options, added -v to print out
                the filter, all coefficients calculated automatically,
                filter now only uses exp(-u^2 / b).
                This programs ONLY uses fft low pass in horizontal(rescaling).
                The program only works without to many artefacts if resizing
                from 720x576 DVB-s (digital satellite PAL Europe) to 352x576
                CVD (China Video Disk).
                ANY other format seems to give a lot of distortion in the
                mjpegtools color bar test signal (square waves).
                If anyone knows a better algo, pls let me know.
                Filter order is also automatically determined.
                As everything else here, this is all experimental.
Keywords:       video, DVB-s, PAL, satellite TV, transcode
                DVD, CVD, SVCD, resizer, mpeg2, mjpegtools,
                FFTW, fft, reverse fft, low-pass.
Author:         panteltje@yahoo.com
Maintained-by:  panteltje@yahoo.com
Primary-site:   ftp sunsite.unc.edu/pub/linux/apps/video/ 
Alternate-site: http://www.home.zonnet.nl/panteltje/subtitles/ (homepage)
Platforms:	LINUX, UNIX
Copying-policy: GPL
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