Bug 268147 – scaleResolutionDownBy >= 4 will cause video freeze when using H264 Codec

• Status: RESOLVED
• Resolution: DUPLICATE
• Component: WebRTC

[simu]

Reproduce Step:

1. Open webrtc samples: https://webrtc.github.io/samples/src/content/peerconnection/change-codecs/
2. Open dev tools
3. Click start Button
4. Select Codec: H264
5. Click Call
6. Input code:

```javascript
(() => {
  const senders = pc1.getSenders();
  const sender = senders.find(s => s.track.kind === "video");
  const params = sender.getParameters();
  
  params.encodings[0].scaleResolutionDownBy = 6;
  sender.setParameters(params);
})()

```
in dev-tools' console and tap ENTER

You will see the right video(received side) is freezed!

[Radar WebKit Bug Importer]

<rdar://problem/122172715>

[youenn fablet]

@simu, is it specific to macOS Intel?

I cannot reproduce in my AS device.

[youenn fablet]

The issue might be that WebKit on macOS Intel can go as low was 192x108 but no lower at the moment.

[youenn fablet]

*** This bug has been marked as a duplicate of bug 268098 ***