[Webkit-unassigned] [Bug 233036] New: Safari 15.1 H264 FullHD video encode/decode fails

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=233036

            Bug ID: 233036
           Summary: Safari 15.1 H264 FullHD video encode/decode fails
           Product: WebKit
           Version: Safari 15
          Hardware: Unspecified
                OS: Unspecified
            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 on:
macOS: 12.0.1, Mac mini (2018)
Safari: Version 15.1 (17612.2.9.1.20)
WebCam: Logitech C910

Steps to reproduce the issue:
1) Go to https://webrtc.github.io/samples/src/content/peerconnection/constraints/
2) Change the resolution settings to FullHD (1920x1080).
```
    "video": {
        "width": {
            "min": "1851",
            "max": "4096"
        },
        "height": {
            "min": "1053",
            "max": "2160"
        }
    }

```
3) Click the button 'Get Media'
4) Click the button 'Connect'

The result is: Output video is black

-----

Some observations:

1) There is a Safari settings: Developer > Experimental Features > Webrtc H264 LowLatency Encoder. This is enabled by default. If it is turned OFF then the above scenario (H264 with FullHD) works fine.

2) If the resolution is up to HD (1280x720) then the above scenario works fine. Anything above 1280x720 causes black output.

3) If the codec is VP8 or VP9 then there is no problem with FullHD video.

4) The same issue happens also if the video is encoded on desktop Safari 15.1 and decoded on mobile Safari 15.1 (iOS).

5) The issue is not present if the video is encoded on desktop Safari 15.1 and decoded on desktop Chrome 95. H264 with FullHD works fine is this case.

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