1391215 - Firefox 54 Windows 10 : error with Logitech webcam c920: MediaStreamError { name: "InternalError", message: "Starting video failed", constraint: "", stack: ""

Status: RESOLVED INCOMPLETE

(Core :: WebRTC, defect, P2)

Description

[roger]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/603.3.8 (KHTML, like Gecko) Version/10.1.2 Safari/603.3.8

Steps to reproduce:

Using WebRTC we are getting a black screen using the Logitech c920 with Firefox 


Actual results:

Visiting 

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

For example shows only a black screen. Error is MediaStreamError { name: "InternalError", message: "Starting video failed", constraint: "", stack: ""



Expected results:

Should be showing preview of users webcam with audio. Works in Chrome and Edge on same computer.

Comment 1

[Alex Chronopoulos [:achronop]]

Jib, since you have win 10 and that camera can you please try to verify that issue

Comment 2

[Jan-Ivar Bruaroey [:jib] (needinfo? me)]

I tested comment 0 on Nightly without problem, then I downloaded 54.0.1. and ran it there. The first time I ran it (and only then) did I get a black screen, but my whole system froze shortly after, and before I could look in web console to verify the error.

I've run in countless times since without being able to reproduce, except that first time. So Ihave to say I'm unable to reproduce, sorry.

Comment 3

[Jan-Ivar Bruaroey [:jib] (needinfo? me)]

I should say I tested it on Windows 10 Pro with Logitech HD Pro Webcam c920.

Comment 4

[roger]

(In reply to Jan-Ivar Bruaroey [:jib] (needinfo? me) from comment #3)
> I should say I tested it on Windows 10 Pro with Logitech HD Pro Webcam c920.

Thanks for that, unfortunately we are able to replicate each time. I asked the developer to try the nighly build but he had the same result. Seems to be the same setup - Windows 10 Pro and the cam is a Logitech HD Pro c920.

Comment 5

[Alex Chronopoulos [:achronop]]

Can you get logs? Please activate flags: cubeb:4,MediaStreamGraph:4

Comment 6

[roger]

Hi, sorry Browser updated to v55.0.3 - still same issue though. 

Developer got aback to me with: 

Activated cubeb:4 using about:config
Can't see MediaStreamGraph option anywhere

Still seeing problem in Nightly 57.0a1 & viewing logs in Browser Console window.  But cannot see any error logs.

Can't find MediaStreamGraph in 55.0.3 either - 

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

MediaStreamError { name: "InternalError", message: "Starting video failed", constraint: "", stack: "" }  main.js:46:5
	errorMsg https://webrtc.github.io/samples/src/content/getusermedia/gum/js/main.js:46:5
	handleError https://webrtc.github.io/samples/src/content/getusermedia/gum/js/main.js:40:3


Can you please provide more detailed instructions?

Comment 7

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

see https://wiki.mozilla.org/Media/WebRTC/Logging
You want to set environment var MOZ_LOG=cubeb:4,MediaStreamGraph:4,GetUserMedia:5,MediaManager:4  (case matters!)
MOZ_LOG_FILE will tell it where to store the log; note that if multi-process is enabled, you'll have logname-child.1 or some such as well as logname -- please send all of them.

Comment 8

[Bulk Bug Changes for mreavy's org]

Mass change P1->P2 to align with new Mozilla triage process

Comment 9

[Andreas Pehrson [:pehrsons]]

No response from reporter - closing as incomplete.