Bug 275906

Summary:	Animated AVIF with transparency doesn't play correctly
Product:	WebKit	Reporter:	Jake Archibald <jaffathecake>
Component:	Images	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED MOVED
Severity:	Normal	CC:	jean-yves.avenard, jer.noble, rajsite, sabouhallawa, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	Safari Technology Preview
Hardware:	Unspecified
OS:	Unspecified

Description Jake Archibald 2024-06-26 10:27:00 PDT

https://static-misc-3.glitch.me/alpha-video-test/avif-img.html

In Safari 17.5, it plays back slowly, and with incorrect transparency.

Compare to Chrome or Firefox for the correct rendering (although playback performance is poor in Chrome) https://issues.chromium.org/issues/349566435.

Comment 1 Radar WebKit Bug Importer 2024-06-26 11:06:01 PDT

<rdar://problem/130607349>

Comment 2 Said Abou-Hallawa 2024-06-26 14:26:12 PDT

Thank you for the report! This is an issue below WebKit, tracked by Apple internally as rdar://130607349.