I changed it to WMP and it crashed again overnight, showing VLC again as the faulting module... strange.
Application: BigBox.exe
CoreCLR Version: 4.700.20.26901
.NET Core Version: 3.1.6
Description: The process was terminated due to an unhandled exception.
Exception Info: exception code c0000005, exception address 00007FF88A41CF19
Faulting application name: BigBox.exe, version: 11.9.0.0, time stamp: 0x5fb3100b
Faulting module name: libavcodec_plugin.dll, version: 3.0.11.0, time stamp: 0xa720a698
Exception code: 0xc0000005
Fault offset: 0x0000000000a6cf19
Faulting process id: 0x2264
Faulting application start time: 0x01d6f6ca18227034
Faulting application path: F:\LaunchBox\Core\BigBox.exe
Faulting module path: F:\LaunchBox\ThirdParty\VLC\x64\plugins\codec\libavcodec_plugin.dll
Report Id: af24584d-f5bd-494c-b51e-49207c601667
Faulting package full name:
Faulting package-relative application ID: