[Webkit-unassigned] [Bug 212022] New: Video and browser freeze when low-resolution and H.264 is used

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=212022

            Bug ID: 212022
           Summary: Video and browser freeze when low-resolution and H.264
                    is used
           Product: WebKit
           Version: Safari 13
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: milen.yordanov at gmail.com
                CC: youennf at gmail.com

Tested with Safari 13.1.4 (mac mini 2018, macOS 10.15.4)

The issue can be reproduced with: https://jsfiddle.net/milen/ur6bfjkL/ 

The steps are: 

1) Use getUserMedia() with a resolution 320x240 or higher.
2) Create Webrtc call. Everything works fine.
3) Try to lower the resolution to 160x90 with track.applyConstraints(). The video and the browser freeze. 

The expected result: video should play smoothly and the resolution should change.
The actual result: video and browser freeze.

This happens only with H.264 codec. If the connection is forced to use VP8 then this scenario works fine.

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