1044707 - WebRTC Logitech c920 fails in Firefox on WIndows 8.1

Status: VERIFIED FIXED

(Core :: WebRTC: Audio/Video, defect)

Description

[Scott Gurvey]

User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0 (Beta/Release)
Build ID: 20140724030201

Steps to reproduce:

This one has me stumped. I recently bought a Logitech c920 to improve the image produced by my old c610 webcam.
While the c610 worked with webRTC in both Chrome and Firefox as tested by going to https://apprtc.appspot.com/,
the c920 works fine in Chrome but fails in Firefox. Firefox turns on the camera but the image is black.
As I understand it, the c920 has on board H.264 hardware conversion built into the camera, which I don't believe is true for the c610.
I'm using Windows 8.1 desktop, Chrome 36.0.1985.125 m, Firefox 31.0.
Does anyone understand what is happening here?
Thank you.


Actual results:

Video image is black in Firefox.


Expected results:

Should see video image. (I do see video image in Chrome)

Comment 1

[Randell Jesup [:jesup] (needinfo me)]

I just tried it on Nightly/34/Linux and Aurora/32/Windows7 (last Aurora before it went to Beta last week).  A c920 works for me in both with http://mozilla.github.com/webrtc-landing/gum_test.html

It did *not* work for me on WIndows8.1/Aurora/32.  So I think there's an OS issue involved

Comment 2

[Scott Gurvey]

Randell, Thank you for that additional information. I had also tested using Nightly and found the bug to be present but I did not have a Windows 7 system available. I agree this is a Windows 8 problem. I am trying to what is going on with the OS interactions which would cause Windows 8 to break Firefox but not Chrome.

Comment 3

[websites]

There used to be a similar bug (https://bugzilla.mozilla.org/show_bug.cgi?id=942284) which was solved with Firefox 29, causing "green snow" to show as video on Windows 8 / 8.1 with some Logitech cams.

I am using Logitech C510 and since Firefox 30, again, there is no more video, just a blank window.

Comment 4

[Scott Gurvey]

I have been checking every now and then using Nightly and as of yesterday, Nightly 34.0a1, my problem seems to have been fixed. I'm not certain when this exactly happened but I can report that my Logicam is now working fine in Firefox under Windows 8.1  as of 34.0a1. Just to check, I did confirm that it still fails with the current general release, Firefox 31. Whoever made the repair, thank you!

Comment 5

[Maire Reavy [:mreavy]]

Thanks for commenting, Scott!   I believe the person to thank is Gian-Carlo (gcp on irc).  I just added him to the cc of this bug.  He fixed Bug 929431 which went to central on 8/18.   

It sounds like we should consider uplifting his fix if it's not to risky to do so.

Comment 6

[Gian-Carlo Pascutto [:gcp]]

The person with the Logitech C510, can you check whether current Nightly also solves your problem?

Comment 7

[websites]

Hello everybody! I just tested this issue with nightly 34.0a1 and my Logitech C510 and it works fine as well. Thanks for working on it!

Comment 8

[[SV Manager] Florin Mezei, QA (:FlorinMezei)]

Marking as Verified for Firefox 34 based on comment 4 and comment 7. 

Scott, [e-mail], do you guys think you could also give it a try with a Firefox 33 build (e.g. ftp://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/33.0b1-candidates/build1/)?

Comment 9

[websites]

Hi there! 

My cam is working with that proposed 33.0 version above as well, current stable version 32.0 not yet. I hope this is of any help...

Comment 10

[[SV Manager] Florin Mezei, QA (:FlorinMezei)]

Marking as verified on version 33 based on comment 9.