having the same issue and have not found a fix yet.
the only thing I changed was switched from avast! endpoint protection suite plus antivirus to kaspersky labs endpoint security antivirus since it worked yesterday before the update happened yesterday.
Found the Solution(for me at least) and possibly fivem developers can fix this
It appears Kaspersky Labs Endpoint Security Antivirus doesn’t like FiveM trying to somehow use mumble to initialize audio capture device, as when Kaspersky is on, it says failed to start audio capture device - IAudioClient
When Kaspersky is off, it doesn’t care and it works.