No audio from some participants. Video works

Hi,
I have encountered an issue where some users will connect to a conference. We can see their video but can’t their audio.

Here’s the JVB log with severe issues during the conference:

> 2020-06-26 00:28:36.200 WARNING: [92] [confId=f484372deda8df3c epId=7fb26ed6 gid=ff3978 stats_id=Al-jjL conf_name=5313782151] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=100, Ssrc=1742423176, SeqNum=30843, M=true, X=true, Ts=4073601414, encodings=
> 2020-06-26 00:28:36.203 WARNING: [92] [confId=f484372deda8df3c epId=7fb26ed6 gid=ff3978 stats_id=Al-jjL conf_name=5313782151] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=96, Ssrc=456803059, SeqNum=2398, M=true, X=true, Ts=4073601414, encodings=
> 2020-06-26 00:28:36.204 WARNING: [93] [confId=f484372deda8df3c epId=7fb26ed6 gid=ff3978 stats_id=Al-jjL conf_name=5313782151] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=96, Ssrc=456803059, SeqNum=2399, M=false, X=true, Ts=4073601414, encodings=
> 2020-06-26 00:28:36.210 WARNING: [93] [confId=f484372deda8df3c epId=7fb26ed6 gid=ff3978 stats_id=Al-jjL conf_name=5313782151] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=96, Ssrc=456803059, SeqNum=2400, M=true, X=true, Ts=4073601414, encodings=
> 2020-06-26 00:28:36.210 WARNING: [93] [confId=f484372deda8df3c epId=7fb26ed6 gid=ff3978 stats_id=Al-jjL conf_name=5313782151] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=96, Ssrc=456803059, SeqNum=2401, M=false, X=true, Ts=4073601414, encodings=
> 2020-06-26 00:28:36.215 WARNING: [93] [confId=f484372deda8df3c epId=7fb26ed6 gid=ff3978 stats_id=Al-jjL conf_name=5313782151] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=96, Ssrc=456803059, SeqNum=2402, M=true, X=true, Ts=4073601414, encodings=
> 2020-06-26 00:28:36.216 WARNING: [91] [confId=f484372deda8df3c epId=7fb26ed6 gid=ff3978 stats_id=Al-jjL conf_name=5313782151] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=96, Ssrc=456803059, SeqNum=2403, M=false, X=true, Ts=4073601414, encodings=
> 2020-06-26 00:28:36.216 WARNING: [91] [confId=f484372deda8df3c epId=7fb26ed6 gid=ff3978 stats_id=Al-jjL conf_name=5313782151] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=96, Ssrc=456803059, SeqNum=2404, M=true, X=true, Ts=4073601414, encodings=
> 2020-06-26 00:28:36.216 WARNING: [91] [confId=f484372deda8df3c epId=7fb26ed6 gid=ff3978 stats_id=Al-jjL conf_name=5313782151] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=96, Ssrc=456803059, SeqNum=2405, M=false, X=true, Ts=4073601414, encodings=
> 2020-06-26 00:28:36.216 WARNING: [91] [confId=f484372deda8df3c epId=7fb26ed6 gid=ff3978 stats_id=Al-jjL conf_name=5313782151] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=96, Ssrc=456803059, SeqNum=2406, M=true, X=true, Ts=4073601414, encodings=
> 2020-06-26 00:28:36.217 WARNING: [91] [confId=f484372deda8df3c epId=7fb26ed6 gid=ff3978 stats_id=Al-jjL conf_name=5313782151] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=96, Ssrc=456803059, SeqNum=2407, M=false, X=true, Ts=4073601414, encodings=
> 2020-06-26 00:28:36.221 WARNING: [91] [confId=f484372deda8df3c epId=7fb26ed6 gid=ff3978 stats_id=Al-jjL conf_name=5313782151] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=100, Ssrc=2342550654, SeqNum=21510, M=true, X=true, Ts=2226047257, encodings=
> 2020-06-26 00:28:36.229 WARNING: [89] [confId=f484372deda8df3c epId=7fb26ed6 gid=ff3978 stats_id=Al-jjL conf_name=5313782151] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=100, Ssrc=1742423176, SeqNum=30844, M=true, X=true, Ts=4073604204, encodings=
> 2020-06-26 00:28:36.230 WARNING: [89] [confId=f484372deda8df3c epId=7fb26ed6 gid=ff3978 stats_id=Al-jjL conf_name=5313782151] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=96, Ssrc=456803059, SeqNum=2408, M=true, X=true, Ts=4073604204, encodings=
> 2020-06-26 00:28:36.231 WARNING: [89] [confId=f484372deda8df3c epId=7fb26ed6 gid=ff3978 stats_id=Al-jjL conf_name=5313782151] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=96, Ssrc=456803059, SeqNum=2409, M=true, X=true, Ts=4073604204, encodings=
> 2020-06-26 00:28:36.243 INFO: [1295] [confId=f484372deda8df3c epId=7fb26ed6 gid=ff3978 stats_id=Al-jjL conf_name=5313782151] Endpoint$7.onReady#882: SCTP connection is ready, creating the Data channel stack
> 2020-06-26 00:28:36.243 INFO: [1295] [confId=f484372deda8df3c epId=7fb26ed6 gid=ff3978 stats_id=Al-jjL conf_name=5313782151] Endpoint$7.onReady#909: Will wait for the remote side to open the data channel.
> 2020-06-26 00:28:36.243 SEVERE: [1291] [confId=f484372deda8df3c epId=7fb26ed6 gid=ff3978 stats_id=Al-jjL conf_name=5313782151] DataChannelStack.onIncomingDataChannelPacket#81: Could not find data channel for sid 0
> 2020-06-26 00:28:36.243 SEVERE: [1291] [confId=f484372deda8df3c epId=7fb26ed6 gid=ff3978 stats_id=Al-jjL conf_name=5313782151] DataChannelStack.onIncomingDataChannelPacket#81: Could not find data channel for sid 0
> 2020-06-26 00:28:36.243 SEVERE: [1291] [confId=f484372deda8df3c epId=7fb26ed6 gid=ff3978 stats_id=Al-jjL conf_name=5313782151] DataChannelStack.onIncomingDataChannelPacket#81: Could not find data channel for sid 0

I am having the same problem right now. It’s one specific computer, using chrome, joining the meeting by calling external API. Sometimes, the screen sharing does not work, but always no sound.
This computer can join the meeting without any problem (hearing, speaking, screen sharing) using Firefox or Edge.
When this computer creates/joins a meeting on meet.jit.si using regular welcome page using Chrome, there is no problem hearing others.

Blockquote
2020-10-09 15:34:27.927 WARNING: [223] [confId=ac2efce6d2e15fef epId=b5e644db gid=ffdc26 stats_id=Syble-klF conf_name=d2awlb6d50acavvkcrlsrw] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=100, Ssrc=920608748, SeqNum=26017, M=false, X=true, Ts=1210287049, encodings=
2020-10-09 15:34:27.950 WARNING: [224] [confId=ac2efce6d2e15fef epId=b5e644db gid=ffdc26 stats_id=Syble-klF conf_name=d2awlb6d50acavvkcrlsrw] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=100, Ssrc=2723810720, SeqNum=26017, M=true, X=true, Ts=1210287049, encodings=
2020-10-09 15:34:28.137 WARNING: [223] [confId=ac2efce6d2e15fef epId=b5e644db gid=ffdc26 stats_id=Syble-klF conf_name=d2awlb6d50acavvkcrlsrw] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=100, Ssrc=920608748, SeqNum=26018, M=false, X=true, Ts=1210287049, encodings=
2020-10-09 15:34:28.140 WARNING: [224] [confId=ac2efce6d2e15fef epId=b5e644db gid=ffdc26 stats_id=Syble-klF conf_name=d2awlb6d50acavvkcrlsrw] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=100, Ssrc=2723810720, SeqNum=26018, M=true, X=true, Ts=1210289929, encodings=
2020-10-09 15:34:28.145 WARNING: [223] [confId=ac2efce6d2e15fef epId=b5e644db gid=ffdc26 stats_id=Syble-klF conf_name=d2awlb6d50acavvkcrlsrw] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=100, Ssrc=920608748, SeqNum=26019, M=true, X=true, Ts=1210287049, encodings=
2020-10-09 15:34:28.148 WARNING: [223] [confId=ac2efce6d2e15fef epId=b5e644db gid=ffdc26 stats_id=Syble-klF conf_name=d2awlb6d50acavvkcrlsrw] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=100, Ssrc=920608748, SeqNum=26020, M=true, X=true, Ts=1210289929, encodings=
2020-10-09 15:34:28.150 WARNING: [219] [confId=ac2efce6d2e15fef epId=b5e644db gid=ffdc26 stats_id=Syble-klF conf_name=d2awlb6d50acavvkcrlsrw] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=96, Ssrc=871622566, SeqNum=22998, M=true, X=true, Ts=1210289929, encodings=
2020-10-09 15:34:28.154 WARNING: [224] [confId=ac2efce6d2e15fef epId=b5e644db gid=ffdc26 stats_id=Syble-klF conf_name=d2awlb6d50acavvkcrlsrw] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=96, Ssrc=871622566, SeqNum=22999, M=true, X=true, Ts=1210287049, encodings=
2020-10-09 15:34:28.158 WARNING: [225] [confId=ac2efce6d2e15fef epId=b5e644db gid=ffdc26 stats_id=Syble-klF conf_name=d2awlb6d50acavvkcrlsrw] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=96, Ssrc=871622566, SeqNum=23000, M=false, X=true, Ts=1210287049, encodings=
2020-10-09 15:34:28.160 WARNING: [219] [confId=ac2efce6d2e15fef epId=b5e644db gid=ffdc26 stats_id=Syble-klF conf_name=d2awlb6d50acavvkcrlsrw] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=96, Ssrc=871622566, SeqNum=23001, M=false, X=true, Ts=1210287049, encodings=
2020-10-09 15:34:28.161 WARNING: [224] [confId=ac2efce6d2e15fef epId=b5e644db gid=ffdc26 stats_id=Syble-klF conf_name=d2awlb6d50acavvkcrlsrw] VideoParser.transform#58: Unable to find encoding matching packet! packet=RtpPacket: PT=96, Ssrc=871622566, SeqNum=23002, M=true, X=true, Ts=1210289929, encodings=