#7621: Add .avif support (AV1 Image File Format
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Reporter: Ewout | Owner: (none)
Type: enhancement | Status: reopened
Priority: wish | Component: avformat
Version: git-master | Resolution:
Keywords: mov | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Changes (by Balling):
* status: closed => reopened
* resolution: fixed =>
Comment:
@Vignesh
We need
a) the chroma siting support for top left of 420 right here:
b) avif MIME
c) the patch for for item_count merged
d) alpha patch support merged
e) HEIC container patches reworked and applied (see HEIF ticket) and HEIF
integrated too, since it is so close
f) maybe cpu-used set to 0 and of course defaulting for lossless (crf 0).
Thank you and sorry for reopening, but I found out that AVIF is more
effective than JPEG XL since JPEG XL requires R'G'B' convertion which is
lossy, dither is hard to compress, but with it turned off rounding of
YCbCr is even harder to compress apparently, does not support subsampling
like in old JPEG, no support for superblack/superwhite in limited range
and out-of-gamut like sYCC, no support for BT.709 matrix like in JPEG
2000, which is just 💩. JPEG XL is useless for me.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/7621#comment:17>
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![Re: [FFmpeg-trac] #7621(avformat:reopened): Add .avif support (AV1 Image File Format](/search?l=ffmpeg-trac@avcodec.org&q=subject:%22Re%5C%3A+%5C%5BFFmpeg%5C-trac%5C%5D+%237621%5C%28avformat%5C%3Areopened%5C%29%5C%3A+Add+.avif+support+%5C%28AV1+Image+File+Format%22&o=newest){kind=link}
