Bug 212472

Summary:	When playing encrypted HLS, video and audio are out of sync gradually.
Product:	WebKit	Reporter:	Yuta Naito <yuta.naito>
Component:	Media	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED DUPLICATE
Severity:	Normal	CC:	jatesadakarn, jer.noble, nonthawat, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	Safari 13
Hardware:	iPhone / iPad
OS:	iOS 13

Description Yuta Naito 2020-05-28 09:05:17 PDT

I found the issue that  video and audio are out of sync gradually when playing encrypted HLS on iOS 13.4、13.5 Safari and macOS Safari (13.1).
When playback starts, the video and audio are synchronized, but they gradually start to misalign video and audio.

It does not happen under the following conditions
・ Under iOS 13.3 
・ Unencrypted HLS
・ Playback with MSE Player (e.g. hls.js)

It's a sample page :  
https://d29c8ds76t1544.cloudfront.net/dev_player/audio_sync/sample_video.html

Comment 1 Radar WebKit Bug Importer 2020-05-28 18:52:03 PDT

<rdar://problem/63741719>

Comment 2 Nonthawat Srichad 2020-05-29 00:02:01 PDT

Hi,

we found the same issue here https://bugs.webkit.org/show_bug.cgi?id=212131

Comment 3 Yuta Naito 2020-05-31 21:03:32 PDT

Hi, Nonthawat 

Thanks for finding same issue. 
I change status because this issue is duprecated .

*** This bug has been marked as a duplicate of bug 212131 ***