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• Process not completing ?

  6 mai 2014, par Abe Miessler

  I am using FFMPEG to convert some audio files. To do this I am using the code below :

  using (Process process = new Process())
  
  {
  
      process.StartInfo.RedirectStandardOutput = true;
  
      process.StartInfo.RedirectStandardError = true;
  
      process.StartInfo.FileName = Path.GetDirectoryName(System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName) +
  
                              @"\bin\ffmpeg.exe";
  
  
  
      process.StartInfo.Arguments = String.Format(@"-i {0} -f mp3 {1}", OrigFilePath, OrigFileFolder + "\\" + NewFileName);
  
  
  
  
  
      process.StartInfo.UseShellExecute = false;
  
      process.StartInfo.CreateNoWindow = true;
  
      process.Start();
  
      System.Diagnostics.EventLog.WriteEntry("ASP.NET 2.0.50727.0", "test... ");
  
      string output = process.StandardOutput.ReadToEnd() + System.Environment.NewLine + process.StandardError.ReadToEnd();
  
      System.Diagnostics.EventLog.WriteEntry("ASP.NET 2.0.50727.0", "Output from process: " + output);
  
      process.WaitForExit();
  
      System.Diagnostics.EventLog.WriteEntry("ASP.NET 2.0.50727.0", "After end... ");
  
  
  
      return true;
  
  }

  In my event log I see the test... log, but I never get to the Output from process: in the logs. It appears that the process is not completing. Has anyone else run into this problem ? Any idea of what is going on and how I can fix it ?

• Error using pipe ffmpeg

  10 décembre 2016, par user3381786

  i am using ffmpeg to record video, but it doesn’t work..

      byte[] texBytes = tex.EncodeToPNG();//get byte[]
  
      proc = new System.Diagnostics.Process();
  
      proc.StartInfo.FileName = "ffmpeg.exe";
  
      proc.StartInfo.Arguments = " -y -r 30 -f rawvideo -codec rawvideo -s 512x512 -pixel_format rgba -i pipe:0 -vf \"transpose = 1\" -r 30 -threads 8 -c:v libx264 -preset slow -crf 18 -pix_fmt yuv420p test2.mp4";
  
      proc.StartInfo.CreateNoWindow = true;
  
      proc.StartInfo.UseShellExecute = false;
  
      proc.StartInfo.RedirectStandardError = true;
  
      proc.StartInfo.RedirectStandardInput = true;
  
      proc.Start();
  
  
  
      MemoryStream ms = new MemoryStream(texBytes);
  
      ms.WriteTo(proc.StandardInput.BaseStream);
  
      ms.Flush();
  
      ms.Close();

  the output file "test2.mp4" is only 1KB. Any problems in my codes ?
  thank you in advance.

• The System Audio not included when recording screen using tab capture api

  21 septembre 2024, par alpecca

  I am working on a chrome extension that let user record their current tab video + the current system audio for example playing a music on the tab. I read the docs on the web about preserve audio on tab capture api and the audio constraint to set to be true

  


  chrome.tabCapture.capture({
        video: true,
        audio: true,


  


  const stream = await new Promise<mediastream null="null">((resolve, reject) => {&#xA;    chrome.tabCapture.capture({&#xA;        video: true,&#xA;        audio: true,&#xA;        videoConstraints: {&#xA;            &#xA;            mandatory: {&#xA;                minFrameRate: 60,&#xA;                maxFrameRate: 60,&#xA;                minWidth: 1920, &#xA;                minHeight: 1080, &#xA;                maxWidth: 1920,&#xA;                maxHeight: 1080,&#xA;            }&#xA;        }&#xA;    }, (stream: MediaStream | null) => {&#xA;        if (chrome.runtime.lastError) {&#xA;            return reject(new Error(chrome.runtime.lastError.message));&#xA;        }&#xA;        resolve(stream);&#xA;    });&#xA;});&#xA;</mediastream>

  


  In the above code, when I set the audio to be true and try to record the screen, the final output doesn't contain any audio.

  


  Here is the Media Recorder values :-

  


  const recorder = new MediaRecorder(stream, {
            mimeType: 'video/webm;codecs=H264',
            videoBitsPerSecond: 8000000
        });

        recorder.ondataavailable = (e: BlobEvent) => {
            socketRef.send(e.data)
           
        }
  
        recorder.start(2000);


  


  And also my ffmpeg in the backend to handle the incoming stream :-

  


  command = [
        'ffmpeg', 
        '-y',
        '-i', 
        '-', 
        '-codec:v', 
        'copy', 
        '-codec:a', 
        'copy', 
        '-y',
        '-f', 'mp4',
        recordingFile,
        # "-"
        # f'output{queueNumber}.mp4',
    ]


  


  Any help would be greatly appreciated :)