Server 3.1.0-rc3 - Failed to init muxer

Since updating to Server 3.1.0-rc3, 2 of my cameras have stopped recording.
System log shows the following error: Failed to init muxer for output file /var/lib/bluecherry/recordings/2021/08/16/000005/11-41-13-motion.mp4: Invalid argument (-22)

These cameras were recording correctly in version Server 3.1.0-rc2.

Thanks this has been fixed and will be released in RC4.

Which Debian or Ubuntu release are you using?

Ubuntu Linux 20.04.2

Can you download this package and see if the problem goes away?

Update loaded, but problem still exists. If I switch off Audio in the Devices → Settings → Properties, the recordings will work.