Bug 219588

Summary:

WebRTC using H.264 on M1 Macs with a built-in camera crashes

Product:

WebKit

Reporter:

Kevin Griffin <kev>

Component:

WebRTC

Assignee:

Nobody <webkit-unassigned>

Status:

RESOLVED INVALID

Severity:

Normal

CC:

szymon.witamborski, webkit-bug-importer, youennf

Priority:

Keywords:

InRadar

Version:

Safari 14

Hardware:

Mac

OS:

macOS 10.15

Attachments:

Description	Flags
Safari WebRTC h.264 crash	none

Description Kevin Griffin 2020-12-06 20:52:23 PST

Created attachment 415536 [details]
Safari WebRTC h.264 crash

WebRTC in Safari and Safari Technology Preview on M1 MacBooks crashes when the codec used is H.264.

Reproduction example:

https://codepen.io/brainshave/pen/qBBWEpM

This codepen allows you to select which codecs will be used to mirror you camera back you. On M1 Macs with a built-in camera,
selecting H.264 and running the example will crash the page. You can uncheck "H.264" and run the example to see that VP8 and VP9 do not exhibit this behavior. This is 100% reproducable for me on a MacBook Air with an M1 chip. This happens in both Safari 14.0.1 (16610.2.11.51.8) and Release 116 (Safari 14.1, WebKit 16611.1.5.3) of Safari Technology Preview.

This crash doesn't occur in Chrome's Apple silicon build, even with H.264 selected.

A crash report from Safari is attached.

Comment 1 Radar WebKit Bug Importer 2020-12-07 02:57:05 PST

<rdar://problem/72041616>

Comment 2 youenn fablet 2020-12-08 00:26:05 PST

Thanks for the report Kevin.
Is the crash specific to the built-in camera? Can you try using the mock devices or USB cameras?

Comment 3 Szymon Witamborski 2020-12-09 00:19:57 PST

Hi Youenn,

We did some extra testing and could confirm that it's *not* reproducible on:

- M1 Air with mock devices
- M1 Mini with external camera

Hence our guess it might be related to the built-in camera in the M1 Air when encoding WebRTC streams with H264.

Comment 4 youenn fablet 2020-12-09 00:34:58 PST

Thanks Szymon, this is helpful

Comment 5 Kevin Griffin 2021-02-01 19:35:39 PST

I updated my M1 MacBook Air to macOS 11.2 today, and I no longer see Safari crashing with the codepen that Szymon provided.

Comment 6 Alexey Proskuryakov 2021-02-08 19:09:37 PST

Thank you for following up! Yes, this is fixed in macOS 11.2. I'm marking the bug as INVALID as it was a system issue below WebKit.