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26th September 2022, 09:42 | #1 | Link |
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AV1: MOD2 or MOD8 - which is better?
I'd like to convert some DCP 2K trailers; as they are 2048x858 and 1998x1080, hence MOD2, I'd like to know if, padding video with black borders until I obtain MOD8 (2048x864 and 2000x1080), AV1 will encode better or if it's the same.
AFAIR there were problems with MOD2 AVC and HEVC encoding with some hardware players; it's still the case with AV1? |
26th September 2022, 21:17 | #2 | Link | |
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5th October 2022, 17:07 | #3 | Link | |
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I try to use MOD8 at least - and MOD16 whenever possible. Back to DCP resolution: I'm aware that 1998x1080 is perfectly 1.85:1, but isn't it "better" (easier? faster? better quality?), for resizers, to have for example 2000x1080 that, when multiplied x0.96 is 1920x1036.8 instead of 1998x1080 that should use x0.96096096... to get 1920x1037.8378368... ? |
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6th October 2022, 11:12 | #4 | Link |
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JFYI, BlueRay h264 rip to MKV of 1920x1080 shows in DGIndexNV log window as being 1920x1088 internally.
(shows internal and external dimensions, Might depend upon encoder).
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6th October 2022, 18:50 | #5 | Link |
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I was aware of the 1920x1088 "thing" - I guess it was to maintain MOD16; I remember that some HDTV recording were indeed 1920x1088, and IIRC few were 1280x1088!
Indeed MOD16 was used for SD resolution on DVD, VCD, SVCD, DVB: 720x576, 704x576, 720x480, 704x480, 544x576, 544x480, 480x480, 352x288, 352x240 |
7th October 2022, 10:09 | #6 | Link |
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Internally h264 is always mod16, and more modern codecs even use bigger blocks and av1 can use up to 128x128 superblocks resulting in a theoretical maximum of mod128, but in reality the encoder is likely going to use smaller blocks at the borders. All of these are technical details and irrelevant to the user, as the video is properly cropped automatically by the decoder to ignore the excess needed solely for encoding.
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