[Webkit-unassigned] [Bug 232006] New: REGRESSION(Safari 15 - iOS 15.1): Muting camera while on a call with H264 crashes tab

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=232006

            Bug ID: 232006
           Summary: REGRESSION(Safari 15 - iOS 15.1): Muting camera while
                    on a call with H264 crashes tab
           Product: WebKit
           Version: Safari 15
          Hardware: iPhone / iPad
                OS: Unspecified
            Status: NEW
          Severity: Blocker
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: daginge at confrere.com
                CC: youennf at gmail.com

When in a call using H264 on the latest 15.1 beta (which I believe is release candidate), if you try to mute the video track (enabled = false), the tab will crash. The most common case in p2p calls is iOS <-> iOS calls.

Reproduced on: 
- iPad Pro 10.5 MQDW2KN/A using iOS 15.1 (19B74)
- iPad Air (4th generation) MYFQ2NF/A using iOS 15.1 (19B74)

Repro steps:
1. Go to https://codepen.io/daginge/pen/porbmVK
2. Request permissions, then start the call. Verify you see two versions of yourself.
3. Click "Mute camera". The tab will crash

Impact:
All WebRTC calls where the outbound video track uses H264.

Workaround:
Disabling H264 seems to do the trick. I cannot reproduce when VP8 is used.

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