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So the FF92 branch has dropped and with that official AVIF support (turned on by default) but at the same time they changed something because all the files that were working in 91 doesn't work right n…
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1. There's no precedent for image formats with distinct MIME types for their still and animated variants, e.g., GIF, PNG, and WebP(?). Why was a different decision made here?
2. As far as I could tel…
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https://github.com/gpac/ComplianceWarden is a tool to check AVIF images and other media formats against specifications.
With an image encoded by CAvif 1.3.0, it reports the following errors:
```…
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Converted images do not pass validation. Results from this [validator](https://gpac.github.io/ComplianceWarden-wasm/avif.html). Images were converted using this command:
`cavif --speed 1 --quality 60…
rkfox updated
2 years ago
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I see the test case for MIAF paragraph 7.3.11.4.2 in spec_miaf_num_pixels.cpp, but it appears to be missing a test for the following rules:
> when the images are in the 4:2:2 chroma sampling format…
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I could not find a test case for MIAF paragraph 7.3.11.4.1:
> All input images of a grid image item shall use the same coding format, chroma sampling format, and the same decoder configuration
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The current version of MIAF Amd 2 says:
> The FileTypeBox shall contain, in the compatible_brands list, the 'mif1' brand (specified in ISO/IEC 23008-12).
Having it mandatory when derived specifica…
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See https://github.com/AOMediaCodec/av1-avif/pull/175
The animals_00_multilayer_grid_lsel.avif file is outputting errors that seem to indicate that the ComplianceWarden is misinterpreting the struc…
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MIAF restricts `clap` transforms and `grid` sizes to be integer multiples of the chroma resolution.
This is not checked yet. I have created two test files.
Example (non-conformant) file with 99x99…
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mp4parse expects the 4 bytes after fourcc in hldr to be 0.
The reference to the standard version you've used [is paywalled](https://www.iso.org/standard/74428.html), but [a copy I've found](https:…