[Webkit-unassigned] [Bug 247704] New: Animated AVIF image animates only one loop on down level macOS and non Apple ports
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Wed Nov 9 15:49:34 PST 2022
https://bugs.webkit.org/show_bug.cgi?id=247704
Bug ID: 247704
Summary: Animated AVIF image animates only one loop on down
level macOS and non Apple ports
Product: WebKit
Version: WebKit Nightly Build
Hardware: Unspecified
OS: Unspecified
Status: NEW
Severity: Normal
Priority: P2
Component: Images
Assignee: webkit-unassigned at lists.webkit.org
Reporter: sabouhallawa at apple.com
CC: sabouhallawa at apple.com
This bug happens because of the hand crafted implementation of AVIFImageReader::repetitionCount(). This was added in r275184.
1. According to https://github.com/AOMediaCodec/av1-avif/issues/73#issuecomment-803017653, libavif does not provide the repetition count.
2. macOS system frameworks do not provide the repetition count for animated AVIF.
3. Chromium just indefinitely repeats all animated AVIF frames.
So to be compatible with other browsers and image viewers, I think we need to return RepetitionCountInfinite for all animated AVIF images.
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