Help using ExportAudioToWavFileTask to export multiple audio streams as one .wav file

[HannahBruch]

Hi, I'm using this teams bot to record call audio for multiple people in MS Teams. I've been able to export each stream to it's own .wav, but I want to export them all to one file that accurately recreates the audio from the teams call. I tried using ExportAudioToWaveFileTask but I am clearly using it wrong. Here's my code, which currently throws System.Exception: 'Stream specification not found: Audio' on the last line

        const string storeName = "test_audio";
        const string path = "C:\\\\store";
        string filePath = Path.Join(path, storeName);
        using Pipeline pipeline = Pipeline.Create();
        PsiStoreStreamReader reader = new PsiStoreStreamReader(storeName, path);
        PsiExporter exporter = PsiStore.Create(pipeline, $"{storeName}_temp", null, false, null);
        var streams = reader.AvailableStreams;
        Dataset dataset = Dataset.CreateAsync(reader).Result;
        dataset.AddSessionAsync(reader);
        ExportAudioToWavFileTask task = new ExportAudioToWavFileTask{};
        var config = new ExportAudioToWavFileTaskConfiguration();
        SessionImporter sessionImporter = SessionImporter.Open(pipeline, dataset.Sessions.First());
        
        task.Run(pipeline, sessionImporter, exporter, config);

[sandrist]

Unfortunately, the WaveFileWriter component (which that batch task uses underneath) does not allow for combining multiple audio streams into a single wav file. We also do not have any kind of "Audio Mixer" component that merges multiple audio streams into a single audio stream. We would be very happy to accept a community contribution that creates such an AudioMixer component, which would take in an arbitrary number of AudioBuffer streams and output a single merged AudioBuffer stream.

In the absence of such a component, my only suggestion is to use other tools to merge multiple wav files together, but you will need to be careful about the start time and synchronization of these wav files.