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This is resizing the chroma to 1/4 res then enlarging it to fit the full frame hoping rounding will get rid of some of the junk, right?
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Yes, kind of. The output of the DV codecs replicates the chrominance over four adjacent pixels. Instead, it would be better to interpolate. But without my filter (which I think was actually written for VirtualDub) you can't fix those samples. The next best thing is to do the above.
Umm...actually. Now that I look at it, the 180x480 downscale should really be just decimation. Hmmm. Can you do that in AVISynth?
Xesdeeni