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• Playing RTSP in WPF application with low latency using FFMediaElement (FFME)

  17 août 2018, par Paboka

  I’m trying to use FFMediaElement (FFME, WPF MediaElement replacement based on FFmpeg) component to play RSTP live video in my WPF application.

  I have a good connection to my camera and I want to play it with minimum available latency.

  I’ve reduced the latency by changing ProbeSize to its minimal value :

  private void Media_OnMediaInitializing(object Sender, MediaInitializingRoutedEventArgs e)
  
  {
  
    e.Configuration.GlobalOptions.ProbeSize = 32;
  
  }

  But I still have about 1 second of latency since the very beginning of the stream. I mean, when I start playing, I have to wait for 1 second till the video appears and then I have 1s of latency.

  I’ve also tried to change following parameters :

  e.Configuration.GlobalOptions.EnableReducedBuffering = true;
  
  e.Configuration.GlobalOptions.FlagNoBuffer = true;
  
  e.Configuration.GlobalOptions.MaxAnalyzeDuration = TimeSpan.Zero;

  but it gave no result.

  Is there any parameter of FFME or FFmpeg I`ve missed ?

• Using C# and ffmpeg to rip audio from an .mp4, ffmpeg stuck until closing the calling application

  19 juillet 2018, par user3806186

  I happened to find this answer :
  https://stackoverflow.com/questions/44981454/c-sharp-extract-mp3-file-from-mp4-file#=

  And it seems to work, However, the conversion process gets stuck, and it only resumes after I have closed the application that called ffmpeg to run.

  The following code is responsible for the launch of ffmpeg :
  (The commented lines are just from testing on how to fix the hanging)

          public static string ConvertToMp3(string inputFile, string outputFile = "extracted_audio.mp3")
  
      {
  
          Console.WriteLine("Converting mp3 to " + Path.GetFullPath("extracted_audio.mp3"));
  
          string mp3out = "";
  
  
  
          try
  
          {
  
              if (ffmpegProcess != null)
  
                  ffmpegProcess.Kill();
  
  
  
              ffmpegProcess = new Process();
  
              ffmpegProcess.StartInfo.UseShellExecute = false;
  
              ffmpegProcess.StartInfo.RedirectStandardInput = true;
  
              ffmpegProcess.StartInfo.RedirectStandardOutput = true;
  
              ffmpegProcess.StartInfo.RedirectStandardError = true;
  
              ffmpegProcess.StartInfo.CreateNoWindow = true;
  
              ffmpegProcess.StartInfo.FileName = Path.GetDirectoryName(System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName) + @"\bin\ffmpeg.exe";
  
              ffmpegProcess.StartInfo.Arguments = "-i " + Path.GetFullPath(inputFile) + " -vn -f mp3 -ab 320k output " + Path.GetFullPath(outputFile);
  
              ffmpegProcess.Start();
  
              ffmpegProcess.StandardOutput.ReadToEnd();
  
              mp3out = ffmpegProcess.StandardError.ReadToEnd();
  
              //ffmpegProcess.WaitForExit();
  
              if (!ffmpegProcess.HasExited)
  
              {
  
                  //ffmpegProcess.Kill();
  
              }
  
          }
  
          catch (InvalidOperationException e)
  
          {
  
              Console.WriteLine("mp3 conversion failed: " + e.Message);
  
              return "";
  
          }
  
  
  
          return mp3out;
  
      }

  I have no idea what causes the halting, any ideas ?

• NReco Error : "The specified executable is not a valid application for this OS platform"

  18 juillet 2018, par swabygw

  I’m using the NReco to convert videos. I declare the converter like the following, and add a handler to ConvertProgress.

  Dim vid_Convert As New FFMpegConverter
  
  AddHandler vid_Convert.ConvertProgress, Sub(sender, e) vidConvertProgress(folder,fname,fext,fverdest,fint,fcount,fhost,e)
  
  vid_Convert.ConvertMedia(file_temp, Nothing, file_dest, "mp4", cSettings)

  The media is converted fine. The problem is in the handler where I declare a new converter and have it do a GetVideoThumbnail (when the prior conversion is completed), like this :

  Dim vid_Extract As New FFMpegConverter
  
  vid_Extract.GetVideoThumbnail(inputFile, outputFile, extractposition)

  This produces the error "The specified executable is not a valid application for this OS platform". However, I’ve executed the GetVideoThumbnail method by itself elsewhere in my program with no problem. For some reason, it won’t work if it’s executed within the handler. Is there a way around this ?