[Webkit-unassigned] [Bug 259045] New: REGRESSION (Safari 16.5): fMP4 HLS livestreams wrong playback start position

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Mon Jul 10 02:18:35 PDT 2023


https://bugs.webkit.org/show_bug.cgi?id=259045

            Bug ID: 259045
           Summary: REGRESSION (Safari 16.5): fMP4 HLS livestreams wrong
                    playback start position
           Product: WebKit
           Version: Safari 16
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: andreas.kogler at bitmovin.com

Created attachment 466997

  --> https://bugs.webkit.org/attachment.cgi?id=466997&action=review

Testpage for reproduction + fake livestream

When playing an HLS livestream with fMP4 segments using native browser playback (i.e. setiing the HLS playlist as `src` of a HTML `video` element), one would expect the livestream to start playing back on the live edge (the right edge) and display the most recent video content.

This worked fine up until Safari 16.3, but in Safari 16.5 playback starts at the end of the DVR window (the left edge). Couldn’t test it with Safari 16.4, so maybe it’s already broken there.

Interestingly, the issue does not occur when the HLS stream contains MPEG-TS segments instead of fMP4.

I have attached a test-page as well as a “fake livestream” to reproduce the issue, but any HLS livestream with fMP4 segments should surface the described issue.

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