[Webkit-unassigned] [Bug 189690] New: Firefox subscribing to WebRTC H.264 video coming from Safari 12 freezes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=189690

            Bug ID: 189690
           Summary: Firefox subscribing to WebRTC H.264 video coming from
                    Safari 12 freezes
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.13
            Status: NEW
          Severity: Major
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: adam at tokbox.com
                CC: youennf at gmail.com

Today Safari updated to 12 and I noticed that it broke WebRTC video going to Firefox.

Steps to repro:

1. Go to app.rtc (or talky.io, or meet.tokbox.com) on Safari 12 and join a room.
2. Join the same room in Firefox 62 (or 60)

Result: The video displays and then immediately freezes in Firefox.

The same issue is not there for Safari 11, it is also not there if you use Safari on iOS 12, only on Desktop from Mac OS.

I filed a bug with Mozilla about this as well https://bugzilla.mozilla.org/show_bug.cgi?id=1492038

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