[Webkit-unassigned] [Bug 229601] New: Audio stutters when playing a m3u8 file during WebRTC conference

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=229601

            Bug ID: 229601
           Summary: Audio stutters when playing a m3u8 file during WebRTC
                    conference
           Product: WebKit
           Version: Safari 14
          Hardware: iPhone / iPad
                OS: iOS 14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: yunzhou at inspify.com

Hi,

We have encountered an issue that during a WebRTC conference, when a m3u8 format file is played using default <video> element, the beginning of the audio is stuttering for about 20 seconds, before it starts to play smoothly. The output of the video's sound is from top speaker.

However, if a mp4 format file is played, it's smooth from beginning without any stuttering. The output of the video's sound is from bottom loudspeaker.

If only a m3u8 format file is played without WebRTC conference, it plays smoothly.

Tested iOS versions:
- iPhone Xs Max on iOS 14.7.1
- iPad 7th Generation on iOS 14.7.1

To reproduce this issue:
- Start a WebRTC call with only yourself in it
- On the same page, play a video in m3u8 format, and verify if the audio stutters in the beginning

Sample app for issue reproduction: https://static.inspify.io/playground/ios_webrtc_audio/index.html
- Click on Join Meeting button
- Approve camera / microphone permission from public Jitsi
- No need to join conference room, while you can see your own video, play the video on top of the page
- Verify if audio is stuttering at the beginning

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