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Am I correct that you plan to pull 4:1:1 then interpolate the chroma? IOW, bypass the codec's attempt to do so?
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Fred -
This is maybe a last resort, but would certainly work if the codecs will even deliver as 4:1:1. But I don't know yet if that much will be needed anyway. I'm busy selling my house and moving so I don't have as much time for this right now.
However if the main problem is just horizontal pixels being replicated then I'll at least provide a quickie filter that does a re-convert to YUY2 properly since that is very simple to do using either a linear or cubic horizontal interpolation. And no data would have been actually lost in duplicating chroma pixels to YUY2 as long as we knew what happened. (and didn't crop or resize first)
However if the problem is at the time of the original 4:1:1 compression I don't know at all what to do about it. There is an inevitable chorma loss in first decimating 4:1 horizontally for 4:1:1 and then again in a square pattern for 4:2:0 MPEG-2/4.
That would be like trying to put a straight MPEG in a square hole.
<bad pun>
Dunno yet.
- Tom