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What's the story with AV1 based image format to replace JPEG?

Also, is HEIF royalty free? Looks like AVIF is using it for container, which is surprising.

Looks like HEIF is not royalty free?? But it's already supported in Chrome and Safari but not Firefox

HEIF container is just ISOBMFF container, so it should be royalty-free.

HEIF has problems because of HEVC encoder, which was replaced in AVIF.

ISO requires the container format to be royalty free?