[Webkit-unassigned] [Bug 257790] New: HLS playback will not switch to high framerate variants on Safari

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=257790

            Bug ID: 257790
           Summary: HLS playback will not switch to high framerate
                    variants on Safari
           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: carl.lindqvist at tv4.se

On desktop Safari, when playing an HLS presentation that has variants with both 25 and 50 fps, Safari will not switch to the higher framerate variants, but will stay on the 25fps stream. The expected result is that it should switch to the higher quality variants. This has been the case for some years now. I can't pinpoint the exact version where this started. Other players, including native playback on iOS and tvOS will switch up to the higher framerate variants without issue.

If the lower framerate variants are removed, Safari has no problem playing the 50fps streams and will play the top variant without issue.

Here is some sample content I have prepared. First, the full presentation. Safari will never go above the 2.5 megabit 25fps stream variant.
https://vod.streaming.a2d.tv/safari50/examplefull.ism/.m3u8

Here is the same content with the 25fps variants removed. This plays fine in Safari, and will switch to the HD variant.
https://vod.streaming.a2d.tv/safari50/example50only.ism/.m3u8

/Carl

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