Using SIPSorceryMedia.FFmpeg on .NET Framework 4.8

[rustak]

Hi, I’m trying to use SIPsorcery to implement a WebRTC stream player. I managed to get the demo working based on the WebRTCClient sample, which uses SIPSorceryMedia.FFmpeg, and that one runs as expected on .NET 8.0.

But I want this to run in an app that is on .NET Framework 4.8, and no matter what I try, FFmpegInit.Initialise always fails.

If I use the FFmpeg binaries installed with winget install "FFmpeg (Shared)" --version 7.0 and don't specify libPath, it ends with like that:

Unable to load DLL 'avdevice.61' under C:\Users\rasto\AppData\Local\Microsoft\WinGet\Packages\Gyan.FFmpeg.Shared_Microsoft.Winget.Source_8wekyb3d8bbwe\ffmpeg-7.0-full_build-shared\bin The specified module could not be found.

When I try the downloaded FFmpeg binaries copied directly to app output folder, it ends similar:

Unable to load DLL 'avdevice.61 under C:\Users\rasto\workspace\lab\dotnet-playground\WpfApp\bin\Debug': The specified module could not be found.

I tried that Dependecies tools which is recommended by the exception message on avdevice-61.dll but I can't see anything wrong:

Check the dependencies of FFmpeg libraries and make sure they are searchable by the operating system's library loader. On linux you can use 'ldd' & 'strace'. On Windows you can use 'Dependencies'.'

To me it looks more like there’s some problem with loading the FFmpeg binaries themselves, not with their actual dependencies, since the exact same binaries work well on .NET 8.0.

So my question is, is SIPSorceryMedia.FFmpeg even supposed to work on .NET Framework 4.8, or am I missing something? I'd be grateful for any advice.

[ha-ves]

@rustak I'm using the exact same winget package version hash: 8wekyb3d8bbwe, but I can load the ffmpeg correctly.
Could you tell the platform you're running it on?

[rustak]

Thank you. At least now I know it's supposed to work on .NET Framework 4.8, so the issue is definitely on my side, but I still can't get it work.

Here are the platform details I'm running:

TargetFrameworkAttribute: .NETFramework,Version=v4.8; 
Runtime: .NET Framework 4.8.9310.0; 
Environment.Version: 4.0.30319.42000; 
CLR ImageRuntimeVersion: v4.0.30319; 
Version: 7.0-full_build-www.gyan.dev

It might be related to the version of SIPSorceryMedia.FFmpeg or FFmpeg.AutoGen. Could you tell me which versions you have? I’m currently on SIPSorceryMedia.FFmpeg 8.0.12 and FFmpeg.AutoGen 7.0.0.

[ha-ves]

@rustak sorry, I meant system/build configuration, because I found this S.O. about the same problem and they were building 32-bit, the ffmpeg build provided using WinGet is 64-bit.

Links:
https://stackoverflow.com/a/79363937
https://www.gyan.dev/ffmpeg/builds/#about-these-builds
https://learn.microsoft.com/en-us/visualstudio/ide/how-to-configure-projects-to-target-platforms?view=visualstudio

[rustak]

You're right. I was using AnyCPU, and that turned out to be the issue. Once I switched the build configuration to x64, the error stopped appearing. Thanks!