REGRESSION (Safari 15): Receive audio with a little background noise continually

[walter]

# Steps:
 1. Alice starts a webex meeting from webex web app in Safar 15.0 on MAC OS 11.6
 2. Bob Join the meeting from webex web app in Chrome on windows 10 
 3. All are enable VOIP.
 4. Alice mute her audio.
 5. Bob use "VB-Audio Virtual Cable"(https://vb-audio.com/Cable/) to play a mp4 that is a talk video.

# Expect Result:

Alice should be able to hear audio clearly in Safari 15

# Actual Result:

Alice hears audio with a little background noise continually in Safari15.

In the same MAC, Alice can hear the audio clearly without noise if she use Chrome to join the meeting

And it is ok by Safari 14.0, we only found the issue in Safar 15.0 

# attachment

1. the original mp4 file that played on Bob's PC (windows 10 + chrome)
https://github.com/walterfan/webrtc_primer/blob/main/material/obama_talk.mp4

the wav file extracted from the video file: https://github.com/walterfan/webrtc_primer/blob/main/material/obama_talk.wav

2. the audio record file that Alice heard that with a little background noise

https://github.com/walterfan/webrtc_primer/blob/main/material/obama_talk_noise.wav

[Radar WebKit Bug Importer]

<rdar://problem/84223894>

[youenn fablet]

This might be fixed by https://bugs.webkit.org/show_bug.cgi?id=232427.