New issue
Advanced search Search tips

Issue 863722 link

Starred by 1 user
Status: WontFix
Owner: ----
Closed: Jul 16
Cc:
guidou@chromium.org
Components:
EstimatedDays: ----
NextAction: ----
OS: Windows
Pri: 2
Type: Bug



Sign in to add a comment

mediaDevices.getUserMedia provides "fake" video dimensions instead of rejecting the promise

Reported by viktor.k...@gmail.com, Jul 15 
UserAgent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0

Steps to reproduce the problem:
1. Require an unsupported resolution (eg, 1x1 or 3x333).
2. Be surprised that this is supported.

What is the expected behavior?
If I request video.width.exact=1 or video.width.max=1 the promise must be rejected. See the example in 1x1.html.

What went wrong?
If the camera does not support the required resolution, the browser must reject the promise. However, if the requested resolution is below the maximum supported, Chrome resizes the video output to fit the constraints.

Did this work before? No 

Does this work in other browsers? Yes

Chrome version: 67.0.3396.99  Channel: stable
OS Version: 6.1 (Windows 7)
Flash Version: 

I can reproduce this bug on Chrome 67.0.3396.99 and 58.0.3029.110 under Windows 7 and Windows 10. Firefox and Edge are not affected.
1x1.html
264 bytes View Download

Comment 1 by guidou@chromium.org, Jul 16

Status: WontFix (was: Unconfirmed)
This is a feature, not a bug. Firefox and Edge simply do not support downscaling.
In the future, browsers will converge when they start supporting the resizeMode constrainable property, which will be able to enable/disable rescaling.

Comment 2 by guidou@chromium.org, Jul 16 

BTW, nothing in the spec says that the browser must reject the promise in the examples you provide. Both downscaling and rejecting are valid behaviors according to spec.

Comment 3 by viktor.k...@gmail.com, Jul 17 

Thank you for clarification and please forgive my confusion. For me this is an unexpected behaviour, because in fact the source doesn't support the required capability and I mistakenly believed that browser must reject the promise since 1x1 is not an operating mode.

As for resizeMode, are there any plans when it will be supported by Chrome?

Comment 4 by guidou@chromium.org, Jul 17 

We plan to support resizeMode, but we do not know when it will be ready. See  bug 	854980 .

Comment 5 by viktor.k...@gmail.com, Jul 17 

Thank you for your time! I already starred that bug and I'll wait for any good news, because my task requires to detect only native resolutions.

Best regards,
Victor.
►

Sign in to add a comment