Thread: VirtualDub2
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Old 18th October 2018, 04:39   #698  |  Link
WorBry
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@ poisondeathray

Quote:
Originally Posted by poisondeathray View Post
@WorBry - if you have serially changing each generation , it suggests some interpolation going on, probably bicubic. If you have blocky sharp color borders and preserved same up/down over each generation, it can only be nearest neighbor . You can verify this by controlling the algorithm in say vapoursynth or avisynth or ffmpeg , export either v210 or v410 and check . You can check the RGB conversion algorithm this way too
Just as a post script. I've been doing just that with the 'Checkers-422' clip in AVISynth+ - converting to 10bit YUV444 and back to 10bit YUV422 using different chroma-sampler combinations and then (via p210 output) encoding to v210 in VDub2. Based on the pattern of results seen on the Resolve scopes and comparative quality metrics (SSIM and PSNR) I'm convinced that Resolve applies Bilinear chroma up-sampling and down-sampling when v210 is 'pass-through' exported to v210. Any other 'chroma-sampler' combination would produce measurably different results.

There I'm done. Sorry to interrupt more important VDub2 business.
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Last edited by WorBry; 18th October 2018 at 04:51.
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