Bug 219643 – applyConstraints() should update track correctly when no constraints passed at first

• Status: RESOLVED
• Resolution: CONFIGURATION CHANGED
• Component: WebRTC

[Daria]

Function applyConstraints() does not work as expected.

Where? 
- issue is only reproduced on Mac"16 (and probably on iOS.14 but needs to be check)
- only on Safari - works on other browsers

How?

Steps to reproduce:

1. Start video without any constraints.
2. Then try to apply new constraints (1080x720) using applyConstraints()
(it is easy to reproduce using https://developer.mozilla.org/en-US/docs/Web/API/Media_Streams_API/Constraints - at the bottom there is box with example so when video is started with empty object and then user tries to apply new constraints - camera starts blinking, there is black screen and then camera is off).

Expected result:

Constraints are applied properly and camera is on.

Actual result:

Error - "A MediaStreamTrack ended due to a capture failure"
Camera starts blinking, then video went black and camera is off. 

Additional thoughts: when user applies width: 600 and height: 400 it is working well.

[Radar WebKit Bug Importer]

<rdar://problem/72091581>

[youenn fablet]

I would hope this is fixed in latest Safari Tech Preview.
The issue might be that the change of preset takes more than 3 seconds, which is quite long and WebKit then assumes the capture failed.

[Radar WebKit Bug Importer]

<rdar://problem/72091622>

[youenn fablet]

Closing, @Daria, please reopen if you can reproduce the issue.