applyConstraints throws OverconstrainedError if specify exact for deviceId

[Trung Le]

It seems in the latest Safari 15.0, calling applyConstraints for a video media stream track with exact for deviceId will results in OverconstrainedError - Constraint not supported. This works in Safari 14.

[Kevin Neal]

Thanks for filing. Please attach a file, or link to a demo, that documents the bug.

[Radar WebKit Bug Importer]

<rdar://problem/83577361>

[Trung Le]

I have been able to reproduce this issue with just use navigator.mediaDevices.getUserMedia() and applyConstraints() API.
Repo steps:

- Call stream = navigator.mediaDevices.getUserMedia({ video: { deviceId: { exact: <deviceId string> }}}); <- exact here works.
- Call stream.getVideoTracks()[0].applyConstraints({ deviceId: { exact: <deviceId string> }}); <- throw OverconstrainedError error in Safari 15 but not Safari 14.

[youenn fablet]

Thanks for the report, I'll fix it soon but would like to understand the impact for your application.
Thanks,
   Y

[youenn fablet]

Created attachment 439472 [details]
Patch

[EWS]

Committed r283173 (242221@main): <https://commits.webkit.org/242221@main>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 439472 [details].

[Trung Le]

Thanks. That was quick. This completely breaks our video filter when we try to apply video constraints.
Will this be released in the next Safari patch version?

[Trung Le]

This is still an issue in Safari 15.2.

[Trung Le]

The issue is still reproducible in Safari 15.3 but seems to be fixed in Technology Preview version. Will it be available in 15.4?

[youenn fablet]

Yes, it should be fixed in Safari 15.4, can you validate this?