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

[4hera]

I have same problem

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)

[sipsorcery]

I also attempted to use FFmpeg on an Ubuntu docker image and experienced exactly the same problem. I put it down to my explanation above about the mismatched FFmpeg.Autogen (not updated for a year now) and FFmpeg binaries.

So I tracked down the exact version of FFmpeg that FFmpeg.Autogen had run the code generator against (branch n7.0), built it on my Ubuntu docker image and... got exactly the same exception. I've put my docker build files here in case they are useful to anyone.

In conclusion I don't know what problem is and for my own needs I've decided to take a different tack and try and get a key frame VP8 encoder working as part of VP8.NET. As the name implies it's a C# port of the libvpx VP8 codec (deocder only so far) and has terrible performance compared to the native library. For me a fully native video codec would be extermely useful for prototypes and diagnostics AND would avoid the never ending headaches of cross-platform pinvoke. Hence I'll probably pursue that option for the next little while.

[sipsorcery]

Inspired by #100 I decided to try yet again to get the FFmpeg.Autogen bindings working on Linux and I was finally successful.

To build ffmpeg with the required libraries see the build docker file mentioned above here. A pre-built docker image that has the required shared libraries can be found here.

An example how to use the pre-built docker iamge, which includes the packages needed and the shared libraries to copy can be found here. Also available as a pre-built docker image here. Run with:

docker run --rm -it -p 8080:8080 -p 8081:8081 sipsorcery/webrtcgetstarted

and open http://localhost:8080 (replace localhost as reqd) in a browser and click connect to get a test pattern.