Bug 177126

Summary:	getUserMedia fails with an OverConstrainedError when no devices are found
Product:	WebKit	Reporter:	Trond Kjetil Bremnes <tkbremnes>
Component:	WebRTC	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	eric.carlson, jonlee, webkit-bug-importer, youennf
Priority:	P2	Keywords:	InRadar
Version:	Safari Technology Preview
Hardware:	All
OS:	Unspecified

Description Trond Kjetil Bremnes 2017-09-19 01:01:54 PDT

If no devices are detected (MediaDevices.enumerateDevices responds with an empty array), the MediaDevices.getUserMedia fails with a OverConstrainedError.

This can happen if the webcam for some reason fails (happens from time to time on MacOS), or always in the case of the iOS Simulator.

According to the specs, it should have failed with a NotFoundError – OverConstrainedError should happen when the available devices are not able to fulfill the constraints set (e.g. resolution).

Comment 1 youenn fablet 2017-09-19 08:30:41 PDT

I wonder whether there is a fingerprinting issue here, probably not big in practice.

Comment 2 Radar WebKit Bug Importer 2017-09-19 09:25:47 PDT

<rdar://problem/34518610>