AVIF support

[jorenham]

In the 1.5 release, pillow-heif has been used to add .heic support. I noticed that pillow-heif also has .avif functionality. And as far as I can tell, .heic will probably not win the browser-adaptation game against avif, due to its licensing.
So I think I'd be a good addition to integrate avif, as well. It should be an easy to add to willow, at the very least.

[thibaudcolas]

Hi @jorenham, thanks for raising this. I’ve been following python-pillow/Pillow#5201 for a while hoping to see AVIF support directly in Pillow, and didn’t realise pillow-heif was another option!

Just comparing what codecs are used:

• pillow-heif uses libheif, which has libaom, dav1d, SVT-AV1, rav1e
• pillow-avif-plugin / the Pillow PR use libavif, which has libaom, dav1d, SVT-AV1, rav1e, and libgav1

[thibaudcolas]

I’ve opened AVIF support in Wagtail as a separate issue. Support in Willow is the first step, but I believe tracking this on Wagtail’s bug tracker too will give this more visibility.