Quote:
Originally Posted by sneaker_ger
I don't know where that error comes from. If you upscale using PointResize by factor 2 and downscale by factor 2 again, you get the same result. Either chromaresample="point" does not do what I think it does, or it has something to do with the MPEG-2-chroma-placement. Will try to make a test to reproduce the issue myself, but I stand by my original statement that this is algorithm dependent and it is possible to do it without additional blurriness, but not without color skewing (putting some edge cases aside).
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There was some discusion here about whether or not "PointResize" in avisynth was true nearest neighbor
http://forum.doom9.org/showthread.php?p=1569907
On a practical level, this loss occurs, even in other programs that use "nearest neighbor" -
so how do it without bluriness or other detrimental effets like aliased edges in any program???
You can use the YV12 mpeg2 clip provided above in the mediafire link as a test example