[Webkit-unassigned] [Bug 212472] New: When playing encrypted HLS, video and audio are out of sync gradually.

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Thu May 28 09:05:17 PDT 2020


https://bugs.webkit.org/show_bug.cgi?id=212472

            Bug ID: 212472
           Summary: When playing encrypted HLS, video and audio are out of
                    sync gradually.
           Product: WebKit
           Version: Safari 13
          Hardware: iPhone / iPad
                OS: iOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: yuta.naito at play.jp

I found the issue that  video and audio are out of sync gradually when playing encrypted HLS on iOS 13.4、13.5 Safari and macOS Safari (13.1).
When playback starts, the video and audio are synchronized, but they gradually start to misalign video and audio.

It does not happen under the following conditions
・ Under iOS 13.3 
・ Unencrypted HLS
・ Playback with MSE Player (e.g. hls.js)

It's a sample page :  
https://d29c8ds76t1544.cloudfront.net/dev_player/audio_sync/sample_video.html

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