Bug 232006 – REGRESSION(Safari 15 - iOS 15.1): Muting camera while on a call with H264 crashes tab

• Status: RESOLVED
• Resolution: DUPLICATE
• Component: WebRTC

[Dag-Inge Aas]

When in a call using H264 on the latest 15.1 beta (which I believe is release candidate), if you try to mute the video track (enabled = false), the tab will crash. The most common case in p2p calls is iOS <-> iOS calls.

Reproduced on: 
- iPad Pro 10.5 MQDW2KN/A using iOS 15.1 (19B74)
- iPad Air (4th generation) MYFQ2NF/A using iOS 15.1 (19B74)

Repro steps:
1. Go to https://codepen.io/daginge/pen/porbmVK
2. Request permissions, then start the call. Verify you see two versions of yourself.
3. Click "Mute camera". The tab will crash

Impact:
All WebRTC calls where the outbound video track uses H264.

Workaround:
Disabling H264 seems to do the trick. I cannot reproduce when VP8 is used.

[Dag-Inge Aas]

Seems this is reproducible on an iPhone XR with a previous iOS 15.1 beta as well.

MRY42QN/A using 19B5060d

[Luke Warlow]

Seems this is reproducible on Safari 15.1 on macOS too.

Tested using Beta 3 (16612.2.9.1.8) on macOS 11.6.

[Radar WebKit Bug Importer]

<rdar://problem/84454693>

[youenn fablet]

https://bugs.webkit.org/show_bug.cgi?id=231505 should fix this.

[Szymon Witamborski]

Thank you Youenn for a quick reaction!

Could you confirm whether final iOS 15.1 and Safari 15.1 for macOS will ship with or without the fix?

[Alexey Proskuryakov]

*** This bug has been marked as a duplicate of bug 231505 ***

[Dag-Inge Aas]

This bug was not resolved in 15.1 stable. Now all h264 usage will crash the tab. Could we get any indication for when this fix will be released?

[Sam Sneddon [:gsnedders]]

(In reply to daginge from comment #7)
> This bug was not resolved in 15.1 stable. Now all h264 usage will crash the
> tab. Could we get any indication for when this fix will be released?

Apple does not comment on future releases.

[youenn fablet]

(In reply to daginge from comment #7)
> This bug was not resolved in 15.1 stable. Now all h264 usage will crash the
> tab. Could we get any indication for when this fix will be released?

I would recommend checking upcoming iOS betas.

[Dag-Inge Aas]

(In reply to youenn fablet from comment #9)
> (In reply to daginge from comment #7)
> > This bug was not resolved in 15.1 stable. Now all h264 usage will crash the
> > tab. Could we get any indication for when this fix will be released?
> 
> I would recommend checking upcoming iOS betas.

Say no more, say no more. *touches nose profusely* ;)

two workaround:

1. Add this description to offer&answer sdp: "urn:3gpp:video-orientation", it will not cause page crash.
2. Use canvas.captureStream to capture a new video track from getUserMedia. Then, publish canvas track will not cause page crash.

[Neil Young]

Maybe this observation points into the same direction. I agree, the problem with H.264 is not solved in 15.1

https://feedbackassistant.apple.com/feedback/9757570

[Neil Young]

BTW: The crash does not happen if Safari acts as subscriber, even though the same H.264 SDP Offer comes in from the outside. But here Safari just decodes

[Szymon Witamborski]

It appears that this patch landed in iOS and Safari 15.2