Recherche avancée

Sur d’autres sites (6843)

• Send MP3 audio extracted from m3u8 stream to IBM Watson Speech To Text

  20 novembre 2018, par Link69

  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(@"ffmpeg\ffmpeg.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()
  
  </as></asmessage></getresponse>

  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.

• How to convert a Stream on the fly with FFMpegCore ?

  18 octobre 2023, par Adrian

  For a school project, I need to stream videos that I get from torrents while they are downloading on the server.
When the video is a .mp4 file, there's no problem, but I must also be able to stream .mkv files, and for that I need to convert them into .mp4 before sending them to the client, and I can't find a way to convert my Stream that I get from MonoTorrents with FFMpegCore into a Stream that I can send to my client.

  


  Here is the code I wrote to simply download and stream my torrent :

  


  var cEngine = new ClientEngine();

var manager = await cEngine.AddStreamingAsync(GenerateMagnet(torrent), ) ?? throw new Exception("An error occurred while creating the torrent manager");

await manager.StartAsync();
await manager.WaitForMetadataAsync();

var videoFile = manager.Files.OrderByDescending(f => f.Length).FirstOrDefault();
if (videoFile == null)
    return Results.NotFound();

var stream = await manager.StreamProvider!.CreateStreamAsync(videoFile, true);
return Results.File(stream, contentType: "video/mp4", fileDownloadName: manager.Name, enableRangeProcessing: true);


  


  I saw that the most common way to convert videos is by using ffmpeg. .NET has a package called FFMpefCore that is a wrapper for ffmpeg.

  


  To my previous code, I would add right before the return :

  


  if (!videoFile.Path.EndsWith(".mp4"))
{
    var outputStream = new MemoryStream();
    FFMpegArguments
        .FromPipeInput(new StreamPipeSource(stream), options =>
        {
            options.ForceFormat("mp4");
        })
        .OutputToPipe(new StreamPipeSink(outputStream))
        .ProcessAsynchronously();
    return Results.File(outputStream, contentType: "video/mp4", fileDownloadName: manager.Name, enableRangeProcessing: true);
}


  


  I unfortunately can't get a "live" Stream to send to my client.

  


• Find video resolution and video duration of remote mediafile

  22 février 2012, par osgx

  I want to write an program which can find some metainformation of mediafile. I'm interested in popular video formats, such as avi, mkv, mp4, mov (may be other popular too). I want basically to get :

  • Video size (720, 1080, 360 etc)
  • Total runtime of video (may be not very exact)
  • Number of audio streams
  • Name of video codec
  • Name of audio codec

  There is already the mediainfo, but in my program I want to get information about remote file, which may be accessed via ftp, http, samba ; or even torrent (there are some torrent solutions, which allows to read not-yet downloaded file).

  MediaInfo library have no support of samba (smb ://) and mkv format (for runtime).

  Also, I want to know, how much data should be downloaded to get this information. I want not to download full videofile because I have no enough disk space.

  Is this information in the first 1 or 10 or 100 KiloBytes of the file ? Is it at predictable offset if I know the container name and total file size ?

  PS : Platform is Linux, Language is C/C++