cant use USB hub with same web cam model
Reported by
angnicko...@gmail.com,
Apr 18 2018
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Issue descriptionChrome Version : 65.0.3325.181 URLs (if applicable) : NA OS version : windows 10 Network (such as Cable/DSL/Dial up etc): wireless Audio/Video format (if applicable): NA Special chrome flags (if applicable): NA Behavior in Safari (if known): NA Behavior in Firefox (if known): NA Video issue, Audio issue, both, neither? Video <b>Flash or HTML5? <right-clicking most players will either reveal some text</b> with “Flash”; otherwise likely HTML5> HTML5 If the browser or renderer crashed (“Aw, Snap”), please add any crash IDs from chrome://crashes (possibly after enabling crash reporting per http://support.google.com/chrome/bin/answer.py?hl=en&answer=96817) What steps will reproduce the problem? (1) use a usb hub with 2 identical device (2) run the same on webrtc.gitub.io/test-pages/ select multiple video devices What is the expected result? can see both video camera steaming What is the actual result? no video is shown. library crashes. Any additional information (anything else which may help us debug the issue)? Please attach the HTML5/JavaScript code or audio/video files as well as screenshot and/or videos (if applicable)
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Apr 18 2018
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Apr 19 2018
angnickolas@ Thanks for the issue. As USB Hub is not available at TE end to test this issue, adding 'TE-NeedsTriageFromHYD' label and forwarding the issue to Inhouse team for help in further triaging. Thanks..
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Apr 24 2018
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Apr 27 2018
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Apr 30 2018
i notice that this is a common problem with usb web cam and usb hub.
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Apr 30 2018
I tested this and found the following: 1.) The reported issue is about capturing from two cameras simultaneously. Using one camera at a time seems to work fine. 2.) To open two cameras at the same time, I navigated to https://webrtc.github.io/samples/src/content/devices/input-output/ in two separate tabs or windows and selected each of the two same-model cameras. 3.) The issue requires that the id shown in parentheses as part of the camera name in the UI, e.g. 046d:0821 is the same for both cameras. I first had two slightly different ones, even though the camera model was the same, probably due to different hardware revisions. 4.) The same issue happens in both Microsoft Edge and Firefox. 5.) The issue did not happen when not using a (external) USB Hub, i.e. when plugging into the machine directly 6.) The issue happens with both DirectShow and MediaFoundation implementations. 7.) In the DirectShow implementation, the API call where the failure happens is [1], i.e. IMediaControl::Pause(). Based on the above, this is likely an issue either in the camera drivers or the Windows OS that cannot be fixed in Chromium. => Marking as WontFix. [1] https://cs.chromium.org/chromium/src/media/capture/video/win/video_capture_device_win.cc?q=failed+to+pause+the+the+capture+device&dr=CSs&l=585 |
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Comment 1 by vamshi.kommuri@chromium.org
, Apr 18 2018