Animated AVIFs don't work properly on Safari, with inconsistent behavior across iPhone models.
On iPhone 14 Pro (A16, iOS 18.3.1), playback works fine, but on iPhone 15 (A16, iOS 18.3.1), it shows as a still image. iPhone 16 Pro (A18, iOS 18.4 beta) plays correctly, and M1 Pro MacBook handles it well too.
Oddly, Xcode simulator (M1 Pro) only plays a specific file on iPhone 14 Pro. Is this tied to AV1 decoding differences (hardware vs. software) or a WebKit rendering issue? Any insights or documentation would help!
Note: The tested images are commercial files, so I can’t attach them here, but I’m happy to share those upon request.
For help with playing specific movie file formats, please post in the Apple Support Community. The Apple Developer Forums are for questions about APIs and features intended specifically for developers.