Unhandled exception. System.NotSupportedException: Specified method is not supported. ... at FFmpeg.AutoGen.ffmpeg.avdevice_register_all()

[Bungalow12]

Hey all,
I am seeing an issue on Ubuntu 22.04 when attempting to initialize ffmpeg. The exception is

Unhandled exception. Unhandled exception. System.NotSupportedException: Specified method is not supported.
   at FFmpeg.AutoGen.DynamicallyLoadedBindings.<>c.<Initialize>b__2_1227()
   at FFmpeg.AutoGen.DynamicallyLoadedBindings.<>c.<Initialize>b__2_516()
   at FFmpeg.AutoGen.ffmpeg.avdevice_register_all()
   at SIPSorceryMedia.FFmpeg.FFmpegInit.SetFFmpegBinariesPath(String path)
   at SIPSorceryMedia.FFmpeg.FFmpegInit.RegisterFFmpegBinaries(String libPath)
   at SIPSorceryMedia.FFmpeg.FFmpegInit.Initialise(Nullable`1 logLevel, String libPath, ILogger appLogger)

The same code works great on OSX so I am wondering:

1. Is this a known issue?
2. Is there a missing lib I might need?
3. Is this possibly a problem because it is running on a Ubuntu device without a display device? (EC2 instance)

Straight up Google searching isn't helping but I may not be asking the correct thing. Any expertise would be greatly appreciated

[sipsorcery]

What version of FFmpeg do you have installed? Most initialisation exceptions are caused by a version mismatch between the C# autogen package and the installed FFmpeg version. It should be version 7.0

[Bungalow12]

Then that may be my issue I am using 7.1

ffmpeg version 7.1 Copyright (c) 2000-2024 the FFmpeg developers