navigator.mediaDevices.getUserMedia never resolves
I found out, that the getUserMedia Promise in Firefox only resolves, if the Tab is active or by clicking on the Tab Instance: (Firefox, 81.0)
navigator.mediaDevices.getUserMedia({ audio: true}).then(() => console.log("done"))
Otherwise, the Promise never resolves or rejects. Is this a bug or a feature, and where is this documented? Is there a media Config setting, to tell Firefox to allow getUserMedia Promise to resolve in non-active Tabs? Otherwise this looks like a bug for me...
被選擇的解決方法
Solution: "Firefox Autoplay"
about:preferences -> Security -> Autoplay
Audio Autoplay for background Tabs/Windows is not allowed due to the strict Media Policy. The Autoplay setting bypasses the Policy and allows audio to be played for non-active Tabs/Windows (Tabs/Windows in Background)
Edit (2020-12-01) After a little testing and investigation, I found out that playing Audio in non-focused Firefox Tabs/Window is possible with Autoplay. But unfortunately, it is still not possible to bypass the strict policy when it comes to WebRTC/SIP. The Promise stil doesn't resolve, even with Autoplay enabled for all Sites.
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Additional Information: In my tests, I have permanently added audio permissions. The promise is only resolving as soon as I click into the Tab or Alt-Tabbing into it.
One more note: I tried playing around media.block-autoplay-until-in-foreground as well. Maybe this is the setting which causes the strange bug, and not working correctly?
The Bug won't be fixed. As I understand this correctly, this is a security feature: https://bugzilla.mozilla.org/show_bug.cgi?id=1195654
由 Ki-Hyoun Kim 於 修改
選擇的解決方法
Solution: "Firefox Autoplay"
about:preferences -> Security -> Autoplay
Audio Autoplay for background Tabs/Windows is not allowed due to the strict Media Policy. The Autoplay setting bypasses the Policy and allows audio to be played for non-active Tabs/Windows (Tabs/Windows in Background)
Edit (2020-12-01) After a little testing and investigation, I found out that playing Audio in non-focused Firefox Tabs/Window is possible with Autoplay. But unfortunately, it is still not possible to bypass the strict policy when it comes to WebRTC/SIP. The Promise stil doesn't resolve, even with Autoplay enabled for all Sites.
由 Ki-Hyoun Kim 於 修改