[Webkit-unassigned] [Bug 229413] New: iOS / iPadOS 15 video playback performance regression after seek

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=229413

            Bug ID: 229413
           Summary: iOS / iPadOS 15 video playback performance regression
                    after seek
           Product: WebKit
           Version: Other
          Hardware: iPhone / iPad
                OS: Unspecified
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dustin.kerstein at gmail.com

In the latest iPadOS 15 Beta 6, when performing a manual seek while playing a video in Safari, the video will often stutter for several seconds before playing back normally. This behavior is not seen on iPadOS 14.x

1. Try playing this video in Safari on iPadOS 15 - https://files.panomoments.com/bbb_sunflower_2160p_60fps_normal.mp4
2. Let it play for ~60 seconds - note correct playback
3. Manually seek to ~20 mark - note playback will stutter for several seconds before it starts to play correctly
4. If unable to replicate on first try, seek to several different points in the timeline (within the cached buffer)

Please let me know if I can help with any further debug / testing.

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