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Originally Posted by shon3i
I saw that few months ago but i almost always use two pass encoding to prevent this
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Really? How would that help?
Do you have any suggestions for settings?
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maybe you try to switch off deblock.
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I'm not sure how to do that, but why do you think it would help?
I eventually managed to make encodes from yuv at crf 22 deblocking -2-2 and avoid blocks in the output (thanks to Sharktooth's CQM and no-fast-pskip). So far as I can tell, the problem isn't that x264 necessarily
introduces blocking. I'm coming to think that x264's denoiser
reveals blocking that was hidden by noise/dithering in the source, then the encoder reproduces those blocks as faithfully as it can at a given bitrate.
So what I'd really need is either:
- a way to turn off the de-noising and get x264 to encode the dither
- some other encoder that encodes noise (e.g. Xvid)
- some other way to properly dither the original MPEG2 blocks on playback of the final h264