[james-bcn]

What is the advantage of using avif over using an MP4 file?

[zamadatix]

Alpha transparency is supported which you won't get with (normal) AV1 in MP4. The author seems more interested in the default behavior which seems like a waste since AV1 will do videos better.

[rchaud]

smaller file size, transparency support and circumventing autoplay restrictions on Safari.

[zamadatix]

It's really audio that has autoplay limitations, video fine https://developer.apple.com/documentation/webkit/delivering-....

[adzm]

Since every frame is independent they can be quickly decoded