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• FFServer does not stop

  18 mai 2014, par user3235818

  I am trying to stream video from my webcam to a website that I created, using FFMpeg and FFServer on my Ubuntu 12.04 machine. I can successfully start FFServer with an ffserver1.conf file I’ve made, but when I stop FFServer (with crtl+c) to make changes to my config file, and try to start FFServer again, I get an error : Could not start server. Then I try to start the server with the default ffserver.conf (in /etc), I get an error : bind(port 8090) : Address already in use. Sometimes I also get Deleting feed file "/tmp/feed1.ffm’ as stream counts differ (4 != 1).

  It seems to me that the server is not completely stopping when I kill it in the terminal with ctrl+c. Is there another way to stop FFServer ? Or should I just get a different version - I’m currently using version 0.10.11-7:0.10.11-1 precisce1.

  Thank you

• A process' child doesn't get killed from killing the parent process

  2 avril 2022, par Impasse

  I am developing an Electron application. In this application, I am spawning a Python process with a file's path as an argument, and the file itself is then passed to ffmpeg (through the ffmpeg-python module) and then goes through some Tensorflow functions.

  


  I am trying to handle the case in which the user closes the Electron app while the whole background process is going. From my tests though, it seems like ffmpeg's process stays up no matter what. I'm on Windows and I'm looking at the task manager and I'm not sure what's going on : when closing the Electron app's window, sometimes ffmpeg.exe will be a single process, some other times it will stay in an Electron processes group.

  


  I have noticed that if I kill Electron's process through closing the window, the python process will also close once ffmpeg has done its work, so I guess this is half-working. The problem is, ffmpeg is doing intensive stuff and if the user needs to close the window, then the ffmpeg process also NEEDS to be killed. But I can't achieve that in any way.

  


  I have tried a couple things, so I'll paste some code :

  


  main.js

  


  // retrieve video data
ipcMain.handle('get-games', async (event, arg) => {
    const spawn = require('child_process').spawn;
    const pythonProcess = spawn('python', ["./backend/predict_games.py", arg]);

    // sets pythonProcess as a global variable to be accessed when quitting the app
    global.childProcess = pythonProcess;

    return new Promise((resolve, reject) => {
        let result = "";

        pythonProcess.stdout.on('data', async (data) => {
            data = String(data);

            if (data.startsWith("{"))
                result = JSON.parse(data);
        });

        pythonProcess.on('close', () => {
            resolve(result);
        })

        pythonProcess.on('error', (err) => {
            reject(err);
        });
    })
});

app.on('before-quit', function () {
    global.childProcess.kill('SIGINT');
});


  


  predict_games.py (the ffmpeg part)

  


  def convert_video_to_frames(fps, input_file):
    # a few useful directories
    local_dir = os.path.dirname(os.path.abspath(__file__))
    snapshots_dir = fr"{local_dir}/snapshots/{input_file.stem}"

    # creates snapshots folder if it doesn't exist
    Path(snapshots_dir).mkdir(parents=True, exist_ok=True)

print(f"Processing: {Path(fr'{input_file}')}")
try:
    (
        ffmpeg.input(Path(input_file))
        .filter("fps", fps=fps)
        .output(f"{snapshots_dir}/%d.jpg", s="426x240", start_number=0)
        .run(capture_stdout=True, capture_stderr=True)
    )
except ffmpeg.Error as e:
    print("stdout:", e.stdout.decode("utf8"))
    print("stderr:", e.stderr.decode("utf8"))


  


  Does anyone have any clue ?

  


• Backgroundworker quits itself and calls Runworkercompleted function

  5 mai 2017, par yjs990427

  I am using youtube-dl in a cmd process running in a backgroundworker process in wpf application to update its status to a text box asynchronously. There are times in my application that ffmpeg has to work in through the process. However, at the time that ffmpeg process is called (right after youtube-dl’s work is finished) and starts running, backgroundworker calls Runworkercompleted method and kills itself. ffmpeg is called from youtube-dl.

  Is there any fix that make the backgroundworker still work until the ffmpeg’s work is done ? Thanks.

  My DoWork method :

  private void downloadWorker_DoWork(object sender, DoWorkEventArgs e)
  
          {
  
              BackgroundWorker worker = sender as BackgroundWorker;
  
              Process process = new Process();
  
              string[] scripts = (string[])e.Argument;
  
  
  
              string dir = scripts[0];
  
              string scriptText = scripts[1];
  
  
  
              process.StartInfo.FileName = "cmd.exe";
  
              process.StartInfo.WorkingDirectory = dir;
  
              process.StartInfo.Arguments = "/C set path=%path%;" + System.AppDomain.CurrentDomain.BaseDirectory + "&" + scriptText;
  
              process.StartInfo.CreateNoWindow = true;
  
              process.StartInfo.UseShellExecute = false;
  
              process.StartInfo.RedirectStandardOutput = true;
  
              process.StartInfo.RedirectStandardInput = true;
  
              process.StartInfo.RedirectStandardError = true;
  
  
  
              process.Start();
  
  
  
              while (!process.StandardOutput.EndOfStream)
  
              {
  
                  if (downloadWorker.CancellationPending)   // if and only if user calls Abort
  
                  // would this if statement be the problem?
  
                  {
  
                      foreach (var youtube in Process.GetProcessesByName("youtube-dl"))
  
                      {
  
                          youtube.Kill();
  
                      }
  
                      process.Kill();
  
                      e.Cancel = true;
  
                      return;
  
                  }
  
                  else
  
                  {
  
                      string line = process.StandardOutput.ReadLine(); 
  
                      worker.ReportProgress(1, line);                  // reports its status to UI
  
                  }
  
              }
  
          }

  My RunWorkerCompleted method :

   private void downloadWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
  
          {
  
              if (e.Error != null)
  
              {
  
                  MessageBox.Show(e.Error.Message);
  
              }
  
              else if (e.Cancelled == true)
  
              {
  
                  MessageBox.Show("Download Aborted!\r\nYou will need to delete the .part file in the download folder.", "Abort");
  
              }
  
              else if (musicCheckBox.IsChecked == true)
  
              {
  
                  MessageBox.Show("Music Download finished.", "Successful");
  
              }
  
              else if (videoCheckBox.IsChecked == true)
  
              {
  
                  MessageBox.Show("Video Download finished.", "Successful");
  
              }
  
              // CMDoutputTextBox.Text = "";
  
              downloadBtn.Content = "Download!";
  
              downloadBtn.IsEnabled = true;
  
          }

  edit : The backgroundworker produces this output and calls RunWorkerFinished method. ffmpeg does nothing after the output.

  [ffmpeg] Converting video from mp4 to mkv, Destination: TAEYEON 태연_Why_Music Video-WkdtmT8A2iY.mkv