[Webkit-unassigned] [Bug 244505] REGRESSION (iOS 16 Beta 7) Outgoing video is stopped and do not recover for WebRTC call if the iPhone device is connected with a Bluetooth device (AirPods) and User uses Youtube / Spotify or other app in the middle of the call

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=244505

--- Comment #1 from daginge at confrere.com ---
Tried reproducing this. I can kinda do it, but it eventually recovers. Tested on iPhone 12 Pro MGMP3QN/A running iOS 16 Beta 8 (20A5358a) using Airpods Pro A2084 running 4E71 (1.3.8).

Test procedure:
1. Go to https://webrtc.github.io/samples/src/content/peerconnection/pc1/ and initiate the call. Observe that you can see and hear yourself.
2. Go to the home screen and navigate to Spotify
3. Start playing a random song. Observe that the capture color disappears in the clock.
4. Return to Safari. Observe that both video views are black and you can no longer hear yourself.
5. Wait 3-4 seconds. Observe that the page starts capturing again.

I can also reliably reproduce the same behaviour with the YouTube app. Key seems to be starting audio playback in a native app. Expected behaviour (video mutes when Safari is not the active app) happens when I go to home screen and other apps without playing audio, and recovers as expected quickly when Safari is the active app again.

Using my trust gUM debugger (https://codepen.io/daginge/pen/ExLxZzN) I see that the video track mutes as expected when going to the home screen. When the audio starts playing, the audio track mutes. Upon returning to the page, the video and audio track unmutes after 2-3 seconds.

Logs:
Got stream with constraints: {"audio":true,"video":{"facingMode":"user","deviceId":"default","width":1280,"height":720}}
Using video device: Front Camera
The video track is currently unmuted
Using audio device: AirPods
The audio track is currently unmuted
Muted video track: true
Visibilitychange event triggered: Hidden prop is true
Muted audio track: true <-- This is when I start playing Spotify audio
Visibilitychange event triggered: Hidden prop is false
Unmuted audio track: false
Unmuted video track: false

However, if I continue playing audio in Spotify, neither the video or audio track unmutes. If I stop playback, they instantly recover.

In conclusion: I'm able to reproduce this issue on beta 8 if I continuously play audio. It seems to be an OS mute issue, but the capture is luckily never ended, and will recover.

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