Bug 264610 – OverconstrainedError in getUserMedia on iOS 17 with Default Video Track Request

• Component: WebRTC
• Status: REOPENED

[matías lópez]

# Summary

When using navigator.mediaDevices.getUserMedia with default video settings on iOS 17, an OverconstrainedError is triggered regardless of video constraints. The issue, not present in previous iOS versions, prevents access to the video stream without specific width or height constraints.


# Details

When attempting to use navigator.mediaDevices.getUserMedia with default video constraints in iOS 17, an OverconstrainedError is triggered regardless of the video constraint being set to true or false. This error occurs without specifying any width or height constraints for the video track. The issue can be replicated using the following code snippet:

Not works:
```
navigator.mediaDevices.getUserMedia({ audio: true, video: true })
  .then(console.log)
  .catch(console.error);
```
Works (without video key):
```
navigator.mediaDevices.getUserMedia({ audio: true })
  .then(console.log)
  .catch(console.error);
```

# Expected Behavior:
The expected behavior is that the getUserMedia method should successfully access the user's camera and microphone with default settings when the video constraint is set to true.

# Actual Behavior:
The method triggers an OverconstrainedError, preventing access to the video stream, despite not having specific width or height constraints set. Works if you only set audio but not video as key in the constraints.

Steps to Reproduce:

1. Open the DevTools.
2. Execute the above code snippet.
3. Observe the OverconstrainedError being thrown.


# Environment:

Device: iPhone 15 Pro Max
OS: iOS 17
User Agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Mobile/15E148 Safari/604.1


# Additional Information:

This issue does not seem to occur on previous iOS versions.
The error persists regardless of the video constraint being true or false.

Consider was tested on real and emulated iOS.

[matías lópez]

Created attachment 468558 [details]
iOS debugging overconstrained error

[Radar WebKit Bug Importer]

<rdar://problem/118252099>

[matías lópez]

Tested in iOS 17.1.1, works!

[matías lópez]

The affected iOS versions are between 17.0 and 17.1.0.

[matías lópez]

Sorry is not resolved, please test here again: https://8xxv58.csb.app/

This simple code should not throw an OverconstrainedError

navigator.mediaDevices.getUserMedia({ audio: true, video: true })

The bug is still active from iOS 17.

Is critical!! Today iOS users from version 17 can't access the camera (video) on the web. You can use any video app on the web to check.

Basic example: https://webrtc.github.io/samples/src/content/getusermedia/gum/

[youenn fablet]

This might by iPhone 15 Pro Max specific.
Can you provide a sysdiagnose privately with the timestamp where you reproduce the issue to [e-mail]?