Bug 243982 – REGRESSION (iOS 16 Beta 5) Video is broken for WebRTC call if User navigates to Youtube and back

• Component: WebRTC
• Status: RESOLVED CONFIGURATION CHANGED

[Madara Freimane]

Created attachment 461666 [details]
sysdiagnose_2022.08.16_11-45-16+0300_iPhone-OS_iPhone_20A5339d.tar.gz

Summary:
REGRESSION (iOS 16 Beta 5) Video is broken for WebRTC call if User navigates to Youtube and back

Tested devices:
Bug is reproducible on:
- iPhone 13 | iOS 16 Beta 5 (20A5339d)
- iPhone 11 Pro Max | iOS 16 Beta 5 (20A5339d)

Bug is no reproducible on:
- iPhone 11 | iOS 15.6 (19G71)

Use case:
Precondition:
User is in active WebRTC call
Permissions for camera and microphone are set to "Ask" in browser settings

Steps:
1. iOS 16 User navigates to Youtube and listens music for ~3min
2. iOS 16 User navigates back to the Safari browser
3. iOS 16 User accepts permissions 

Actual result:
The outgoing video is broken, and other User sees the black video from iOS 16 User

Expected result:
The outgoing video is available, and other User sees the good incoming video from iOS 16 User

Reproducibility:
100%

Additional information:
-Log file added in attachments (defect reproduced on 16.08.22 at 11:45 EET)

[Madara Freimane]

Created attachment 461668 [details]
sysdiagnose_2022.08.16_13-53-25+0300_iPhone-OS_iPhone_20A5339d.tar.gz

Added additional sysdiagnose file: 
sysdiagnose_2022.08.16_13-53-25+0300_iPhone-OS_iPhone_20A5339d.tar.gz


Seems that we have bigger reproducibility if AirPods connected with device => also audio becomes broken.

And if we disconnect AirPods and rejoin WebRTC join, we don't have outgoing video and audio and Safari freezes.

Let me know if there is a need to add additional information or log file.

[youenn fablet]

From the logs, I can see some errors like:
2022-08-16 11:42:10.311782+0300 0x55A9     Error     0x0                  541    com.apple.WebKit.GPU: (WebCore) [com.apple.WebKit:WebRTC] LocalSampleBufferDisplayLayer::layerErrorDidChange (9958DCCA7039740)

2022-08-16 11:42:10.589290+0300 0x55A9     Error     0x0                  541    com.apple.WebKit.GPU: (WebCore) [com.apple.WebKit:WebRTC] AudioMediaStreamTrackRendererInternalUnit::createAudioUnit AudioUnitInitialize() failed, error = 560557684

We fixed related errors in the latest iOS 16 beta 6.
@Madara, could you have a try?

[youenn fablet]

See also https://bugs.webkit.org/show_bug.cgi?id=243993

[Radar WebKit Bug Importer]

<rdar://problem/98748804>

[Alexey Proskuryakov]

Removed sysdiagnoses, as they prevented importing to Radar, and sharing them isn't good for privacy. Will re-attach to radar directly.

[Madara Freimane]

Hi
unfortunately, I am still able reproduce defects with latest available iOS Beta version: iOS 16 beta 6 (20A5349b), device: iPhone 11 Pro Max

I created folder in Google drive and shared it with and there a new sysdiagnose file:

https://drive.google.com/file/d/1wvzEYrbKWsZv1zujNIDRNRtEvs9tfBBV/view?usp=sharing

sysdiagnose_2022.08.17_14-54-30+0300_iPhone-OS_iPhone_20A5349b.tar.gz

[Madara Freimane]

(In reply to Madara Freimane from comment #7)
> Hi
> unfortunately, I am still able reproduce defects with latest available iOS
> Beta version: iOS 16 beta 6 (20A5349b), device: iPhone 11 Pro Max
> 
> I created folder in Google drive and shared it with and there a new
> sysdiagnose file:
> 
> https://drive.google.com/file/d/1wvzEYrbKWsZv1zujNIDRNRtEvs9tfBBV/
> view?usp=sharing
> 
> sysdiagnose_2022.08.17_14-54-30+0300_iPhone-OS_iPhone_20A5349b.tar.gz

Shared Google drive with Youenn, Alexey and [e-mail]

[Madara Freimane]

Hi!

Added additional sysdiagnose file 
(use case: AirPods connected => navigate to Youtube and back):
https://drive.google.com/file/d/1ubW5LCOkLYull6oozHQB3hH1WD52ykPF/view?usp=sharing
sysdiagnose_2022.08.18_12-34-27+0300_iPhone-OS_iPhone_20A5349b.tar.gz

[youenn fablet]

From the last sysdiagnose, I can see:
2022-08-18 12:30:25.760241+0300 0x1276     Error     0x0                  319    com.apple.WebKit.GPU: (WebCore) [com.apple.WebKit:WebRTC] AudioMediaStreamTrackRendererInternalUnit::createAudioUnit AudioUnitInitialize() failed, error = 560557684

This should be fixed by bug 243249.

I also see that we are stopping past captures since a new camera or microphone is selected, (for instance switching from front to back camera):
2022-08-18 12:32:40.462696+0300 0x1276     Error     0x0                  319    com.apple.WebKit.GPU: (WebKit) [com.apple.WebKit:WebRTC] Ending microphone source as new source is using a different device.

2022-08-18 12:32:55.025852+0300 0x1276     Error     0x0                  319    com.apple.WebKit.GPU: (WebKit) [com.apple.WebKit:WebRTC] Ending camera source as new source is using a different device.

@madara, can you detail which WebRTC website you were using and which actions you did on this website.
I can see YouTube being used between 12:30 until 12:32.
At 12:32, I can see the website is asking for microphone/camera access and is switching from AirPods to iPhone microphone, so we end the AirPods microphone track.

[Madara Freimane]

Respecting the confidentiality, an email was sent with additional information to Youenn.
Let me know if there is a need to make additional tests / we need to give more information about our issue.

[Madara Freimane]

I’m not able to reproduce described issue in ticket with iOS 16.2 Beta 2, build: 20C5043e, iPhone 11 Pro Max.

@Youenn, should we see the fix with this version?

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

[Madara Freimane]

Bug is not reproducible anymore.

Tested OK on:
* iPhone 11 Pro Max | iOS 16.2, build: 20C65
* iPhone 12 Pro Max | iOS 16.2, build: 20C65
* iPhone 14 | iOS 16.2, build: 20C65

Thanks!