.netcore 6 console app on mac - "Specified method is not supported"

When compiling the example found for fingerprinting video, an exception “Specified method is not supported” is thrown.

To Reproduce

public class Playground
	{
        // save fingerprints in Emy Community Edition https://hub.docker.com/repository/docker/addictedcs/soundfingerprinting.emy
        private readonly IModelService modelService = EmyModelService.NewInstance("localhost", 3399);
        //private readonly IModelService modelService = new InMemoryModelService();

        // use FFmpeg to extract samples and frames from files: https://github.com/AddictedCS/soundfingerprinting/wiki/Audio-Services
        private readonly IMediaService mediaService = new FFmpegAudioService();

        public async Task AddClip(string location)
        {


            Console.WriteLine("Add Clip " +location);
            var avHashes = await FingerprintCommandBuilder.Instance
                .BuildFingerprintCommand()
                .From(location, MediaType.Video)
                .UsingServices(mediaService)
            .Hash();
            Console.WriteLine("added, create track");

            var track = new TrackInfo("1234", "BWM", "", MediaType.Video);
            Console.WriteLine("track has been created, now to insert it");
            modelService.Insert(track, avHashes);
            Console.WriteLine("Track has been inserted into model");
        }
}

Program.cs

Playground playground = new Playground();
await playground.AddClip("file.mp4");

Exception is thrown on the " var avHashes = await FingerprintCommandBuilder.Instance…" line.

Exception

System.NotSupportedException: "Specified method is not supported."
  at FFmpeg.AutoGen.Bindings.DynamicallyLoaded.DynamicallyLoadedBindings.<>c.<Initialize>b__6_1428()\n   at SoundFingerprinting.Emy.FFmpeg.Demuxer.OpenInputFile(String file)\n   at SoundFingerprinting.Emy.FFmpeg.Demuxer..ctor(String file, MediaType mediaType, CancellationToken cancellationToken)\n   at SoundFingerprinting.Emy.AudioVideo.Data.FFmpegDataService.<ReadAVTrack>d__4.MoveNext()\n   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)\n   at SoundFingerprinting.Emy.AudioVideo.Data.FFmpegDataService.ReadTrack(String file, MediaType mediaType, Double seconds, AVTrackReadConfiguration configuration)\n   at SoundFingerprinting.Emy.FFmpegAudioService.ReadFramesFromFile(String pathToFile, VideoTrackReadConfiguration configuration, Double seconds, Double startsAt)\n   at SoundFingerprinting.Command.FingerprintCommand.<>c__DisplayClass13_0.<From>b__0()\n   at System.Threading.Tasks.Task`1.InnerInvoke()\n   at System.Threading.Tasks.Task.<>c.<.cctor>b__272_0(Object obj)\n   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)\n--- End of stack trace from previous location ---\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\n   at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)\n   at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)\n--- End of stack trace from previous location ---\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\n   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()\n   at Newsfinder.Playground.<AddClip>d__3.MoveNext() in Playground.cs:line 35\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\n   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()\n   at Program.<<Main>$>d__0.MoveNext() in Program.cs:47

I have the community edition of Envy running in docker, but I also tried InMemoryModelService instead and have the same issue.

Thanks 😃

[AddictedCS]

Unfortunately, brew does not link the contents of/usr/local/opt/ffmpeg@4/lib/ to /usr/local/lib, as it considers it to be just a keg (whatever that means, installing older versions does not link it automatically), so you can either link it manually, or wait until I add a probe path to v8.18.0. The following command will link FFmpeg libraries to /usr/local/lib such that they are available in the executable probing

ln -s /usr/local/opt/ffmpeg@4/lib/* /usr/local/lib

[Bloos]

same thing happened to me on a fedora system. Luckily I was using Docker anyway and could switch over to a ubuntu image