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Old 11th April 2021, 16:49   #101  |  Link
poisondeathray
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Quote:
Originally Posted by kolak View Post
Side note- ProRes444 modes do pass those reserved bits (in official Apple encoder).
Good to know;. But you would expect it to store 0-1023 for 10bit and 0-4095 for 12bit variants because the 4444 variants need to store the alpha channel. You can't have clipping in an alpha channel, or it would be completely useless
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Old 11th April 2021, 18:11   #102  |  Link
kolak
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Well, alpha is a separate "stream" inside ProRes444. It's just losslessly compressed bits, more like a data than video.
444 is always encoded as 12bit. Alpha can be processed as 8 or 16bit.
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Old 11th April 2021, 22:34   #103  |  Link
poisondeathray
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kolak did you use resolve to encode Pr444 or something else ? Did you use that test pattern ? Can you upload the Pr444 output ?


ffmpeg pr444 variant encode results in 4-4091 in 12bit, with the expected gaps at 12bit

If you down convert to 10bit, you get 1-1023, but smooth, basically perfect except for the missing zero value. PSNR y:90.300512

And if you feed native 12bit src, the ffmpeg pr4444 variant is still 4-4091 (and with gaps at 12bpc , not smooth)

Last edited by poisondeathray; 11th April 2021 at 22:55.
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Old Yesterday, 18:13   #104  |  Link
kolak
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It was done in Resolve on Mac.

ffmpeg ProRes444 encoder is 'broken'- 10bit only. They fixed only decoder.
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