1423991 - MediaStreamTrack::GetSettings for video return native resolution sometimes

Status: NEW

(Core :: WebRTC: Audio/Video, defect, P2)

Description

[Andreas Pehrson [:pehrsons]]

STR:
Open two tabs in the same content process
Load https://jsfiddle.net/7udgdbbu/10/ in both
Set one to use a lower resolution than the other, make sure that a lower resolution is in effect
In the tab with the lower resolution, click the GetSettings button

Expected:
The logged settings mention the lower resolution

Actual:
The logged settings mention the higher resolution


This is due to how we treat the resolution when downscaling in MediaEngineRemoteVideoSource.

This is a fingerprinting surface.

Comment 1

[Andreas Pehrson [:pehrsons]]

Bug 1299515 will refactor parts of this class. It might even fix this issue. But let's keep this bug in either case, for adding tests.

Comment 2

[morgan3d]

This is now returning the empty object { } for WebRTC video streams, rather than any width or height at all.

Comment 3

[Andreas Pehrson [:pehrsons]]

In Nightly from 2021-08-08 I see Object { deviceId: "VTPMsImGZbhMAzwBkC4Bd7fqv3vVoyW244edFc1imAs=", frameRate: 30, groupId: "GN/5/DgBYOEGrH12vBWFGdR0oD7BYKXd2ymJJS21Oa0=", height: 480, width: 640 } when logging the settings to the console.

But if you have a way to reproduce the empty object for getSettings, please file a new bug with those details.