Bug 305155

Summary: Some animated AVIFs appear black on Safari
Product: WebKit Reporter: matiasbryan
Component: MediaAssignee: Nobody <webkit-unassigned>
Status: RESOLVED DUPLICATE    
Severity: Normal CC: ahmad.saleem792, ap, jean-yves.avenard, jer.noble, webkit-bug-importer
Priority: P2 Keywords: BrowserCompat, InRadar
Version: Safari 18   
Hardware: Mac (Apple Silicon)   
OS: macOS 15   
URL: https://bryansandbox.imgix.net/_static/bugs/GEN-1226/elephant.png?fm=avif
Attachments:
Description Flags
AVIF of elephant showing a black background in Safari none

matiasbryan
Reported 2026-01-08 15:35:42 PST
Some animated AVIFs have a black background when viewed in Safari. Example: https://bryansandbox.imgix.net/_static/bugs/GEN-1226/elephant.png?fm=avif User agent: ``` Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.6 Safari/605.1.15 ``` This only happens in Safari. Seems to have been an issue since July (haven't tested before that).
Attachments
AVIF of elephant showing a black background in Safari (204.42 KB, image/avif)
2026-01-08 15:37 PST, matiasbryan 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Radar WebKit Bug Importer
Comment 1 2026-01-08 15:35:47 PST
<rdar://problem/167802940>
matiasbryan
Comment 2 2026-01-08 15:37:15 PST
Created attachment 477944 [details] AVIF of elephant showing a black background in Safari
Radar WebKit Bug Importer
Comment 3 2026-01-08 15:38:31 PST
<rdar://problem/167803287>
Tyler Wilcock
Comment 4 2026-01-09 07:32:14 PST
*** Bug 305154 has been marked as a duplicate of this bug. ***
Ahmad Saleem
Comment 5 2026-01-13 14:14:07 PST
Thank you for the report! This is an issue below WebKit, tracked by Apple internally as rdar://130607349.
Alexey Proskuryakov
Comment 6 2026-01-13 15:46:46 PST
*** This bug has been marked as a duplicate of bug 275906 ***
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