Bug 228935

Summary:	PCMU/PCMA audio fails to play
Product:	WebKit	Reporter:	Jay Charles <firstcontact>
Component:	WebRTC	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	webkit-bug-importer, youennf
Priority:	P2	Keywords:	InRadar
Version:	Safari 14
Hardware:	iPhone / iPad
OS:	iOS 14

Description Jay Charles 2021-08-09 17:35:25 PDT

Prior to iOS 14.7, our tracks with PCMU and PCMA audio worked fine. As of 14.7 we're finding that PCMU/A audio will not play correctly on iPhone or iPad. In most cases playback never begins, in some cases playback will start and then stop after about half a second. In the same test case changing only the audio codec to Opus, audio plays as expected every time.

Comment 1 Jay Charles 2021-08-09 18:09:38 PDT

FWIW, I've also found that backgrounding the browser app and then bringing it out of background will result in another fraction of a second of audio playback, then stops again.

Comment 2 youenn fablet 2021-08-10 02:04:31 PDT

Hi Jay,
I'll check this further tonight.
Can you confirm whether https://webrtc.github.io/samples/src/content/peerconnection/audio/ is working or not for you?
If you have MacOS, can you repro the issue there as well?

Comment 3 Radar WebKit Bug Importer 2021-08-10 02:05:17 PDT

<rdar://problem/81733876>

Comment 4 Jay Charles 2021-08-10 06:47:16 PDT

(In reply to youenn fablet from comment #2)
> Hi Jay,
> I'll check this further tonight.
> Can you confirm whether
> https://webrtc.github.io/samples/src/content/peerconnection/audio/ is
> working or not for you?
> If you have MacOS, can you repro the issue there as well?

Thanks Youenn. I can confirm that https://webrtc.github.io/samples/src/content/peerconnection/audio/ is working as expected for me on the same device that exhibits problems with my source. Unfortunately I am not equipped to test MAcOS.

I will set up a test case with my problem source (wowza streaming engine) and send info to you offlist a bit later today.