Vfrdtyky

I'm extracting audio in MP3 format from a M3U8 live url and the final goal is to send the live audio stream to IBM Watson Speech To Text. The m3u8 is obtained by calling an external script via a Process. Then I use FFMPEG script to get the audio in stdout. It works if I save the audio in a file but I don't want to save the extracted audio, I need to send the datas directly to the STT service. So far I proceeded like this:

SpeechToTextService speechToTextService = new SpeechToTextService(sttUsername, sttPassword);

string m3u8Url = "https://something.m3u8";

char buffer = new char[48000];

Process ffmpeg = new ProcessHelper(@"ffmpegffmpeg.exe", $"-v 0 -i {m3u8Url} -acodec mp3 -ac 2 -ar 48000 -f mp3 -");



ffmpeg.Start();

int count;

while ((count = ffmpeg.StandardOutput.Read(buffer, 0, 48000)) > 0)

{

    ffmpeg.StandardOutput.Read(buffer, 0, 48000);

    var answer = speechToTextService.RecognizeSessionless(

        audio: buffer.Select(c => (byte)c).ToArray(),

        contentType: "audio/mpeg",

        smartFormatting: true,

        speakerLabels: false,

        model: "en-US_BroadbandModel"

    );

    // Get answer.ResponseJson, deserializing, clean buffer, etc...

}

When requesting the transcribed audio I'm getting this error:

An unhandled exception of type 'System.AggregateException' occurred in IBM.WatsonDeveloperCloud.SpeechToText.v1.dll: 'One or more errors occurred. (The API query failed with status code BadRequest: Bad Request | x-global-transaction-id: bd6cd203720a70d83b9a03451fe28973 | X-DP-Watson-Tran-ID: bd6cd203720a70d83b9a03451fe28973)'

 Inner exceptions found, see $exception in variables window for more details.

 Innermost exception     IBM.WatsonDeveloperCloud.Http.Exceptions.ServiceResponseException : The API query failed with status code BadRequest: Bad Request | x-global-transaction-id: bd6cd203720a70d83b9a03451fe28973 | X-DP-Watson-Tran-ID: bd6cd203720a70d83b9a03451fe28973

   at IBM.WatsonDeveloperCloud.Http.Filters.ErrorFilter.OnResponse(IResponse response, HttpResponseMessage responseMessage)

   at IBM.WatsonDeveloperCloud.Http.Request.<GetResponse>d__30.MoveNext()

   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

   at IBM.WatsonDeveloperCloud.Http.Request.<AsMessage>d__23.MoveNext()

   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

   at IBM.WatsonDeveloperCloud.Http.Request.<As>d__24`1.MoveNext()

ProcessHelper is just for convenience:

class ProcessHelper : Process

{

    private string command;

    private string arguments;

    public ProcessHelper(string command, string arguments, bool redirectStandardOutput = true)

    {

        this.command = command;

        this.arguments = arguments;

        StartInfo = new ProcessStartInfo()

        {

            FileName = this.command,

            Arguments = this.arguments,

            UseShellExecute = false,

            RedirectStandardOutput = redirectStandardOutput,

            CreateNoWindow = true

        };

    }

}

Pretty sure I'm doing it wrong, I'd love someone to shine a light on this. Thanks.

I still don't know why I can't recognizesessionless my buffer (the second ffmpeg.StandardOutput.Read(buffer, 0, 48000); was a typo btw) but I managed to make it work with websockets like explained there https://gist.github.com/nfriedly/0240e862901474a9447a600e5795d500