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• How to kill a stale process

  12 avril 2015, par Andy

  I run transcoding on Ubuntu server and sometimes the process goes stale and provides no output but ps aux shows process is still running - but with stale CPU usage

  I can get the CPU usage with the following command(ffmpeg process i was working with has process id 4416 :

  ps aux | grep -v grep | grep 4416 | awk '{print $3}'

  and I could probably create a small script to kill a specific process but how would I create a loop that would check each ffmpeg process and kill it if its stale(runit will restart it afterwards) ?

  I think it would need to execute the command to get CPU usage twice with a minute cron and kill the process if CPU usage is the same. Would would I do this ?

• ffmpeg process not terminating - stuck in code

  17 juillet 2023, par hello world

  using (Process process = new Process())
{
    process.StartInfo.FileName = "ffmpeg.exe";
    process.StartInfo.Arguments = "-i video.mp4 -loop 1 -i a.jpg -c:v copy -c:a copy -shortest output_temp.mp4";
    process.StartInfo.UseShellExecute = false;
    process.StartInfo.RedirectStandardOutput = true;
    process.StartInfo.RedirectStandardError = true;
    process.StartInfo.CreateNoWindow = true;
    process.Start();
    process.WaitForExit();
}


  


  I have verified that the input files, video.mp4 and a.jpg, exist in the specified paths and are accessible. Additionally, I've tried removing the -shortest option to rule out an infinite loop, but the issue persists.

  


  I've also redirected the standard output and error streams to log files, but there are no error messages reported.

  


  I'm using the last version of ffmpeg on Windows.

  


  What could be causing the ffmpeg process to get stuck and not terminate as expected ? Are there any other potential reasons I should investigate ? Any help or suggestions would be greatly appreciated. Thank you !

  


  Edit : Also in the mean time ffmpeg command is not working.

  


• C# FFMPEG Process and Multiple files

  23 novembre 2023, par wesman

  I am working on a C# Form tool that will help me convert all of my phone and DSLR video to HEVC, currently, i have a program that uploads the photos and videos to different directories in my home server each time i connect to the WiFi. Once a month or so, i manually convert all the videos, but thought I would automate the process.. I have the Form working perfectly for processing 1 file. but get into trouble when processing a Directory (with possible sub-directories) all at once..

  



  Sorry, this is long, just want to be thorough. here is the button calls

  



  private void processFile_Click(object sender, EventArgs e)
    {
        OpenFileDialog file = new OpenFileDialog();
        file.InitialDirectory = baseMediaDirectory;
        if (file.ShowDialog() == DialogResult.OK)
        {
            ProcessSinlgeFile(file.FileName);
        }
    }


  



  (above)for one file and (below) for a directory

  



  private void processDirectory_Click(object sender, EventArgs e)&#xA;{&#xA;    FolderBrowserDialog file = new FolderBrowserDialog();&#xA;    file.SelectedPath = baseMediaDirectory;&#xA;    if(file.ShowDialog() == DialogResult.OK)&#xA;    {&#xA;       ProcessDirectoryOfFiles(file.SelectedPath);&#xA;    }&#xA;}&#xA;&#xA;private void ProcessDirectoryOfFiles(string selectedPath)&#xA;    {&#xA;        List<string> listOfFiles = GetAllFiles(selectedPath);&#xA;        foreach (string s in listOfFiles)&#xA;        {&#xA;            ProcessSinlgeFile(s);&#xA;        }&#xA;    }&#xA;</string>

  



  both ultimately call this method, to do some checks and setup

  



  private void ProcessSinlgeFile(string fileName)
    {

        if (IsAcceptableMediaFile(fileName))
        {
            outputWindow.AppendText("File to Process: " + fileName);
            processMediaFile = 
                new MediaFileWrapper(this.outputWindow, new MediaFile(fileName), new NReco.VideoInfo.FFProbe());
            if (processMediaFile.OkToProcess)
            {
                int initialCRFValue = 15;
                //ultrafast superfast veryfast faster fast medium slow slower veryslow placebo
                string intialSpeed = "veryfast";
                try {

                    ConvertToMPEG(processMediaFile.getFFMPEGCommand(initialCRFValue, intialSpeed), processMediaFile);
                }
                catch
                {
                    // at somepoint, we'll catch a bad file size (or compression)
                    // then change the CRF value and/or compression speed
                }
            }
        }
    }


  



  ultimately I get to this Method and run into trouble.

  



      private async void ConvertToMPEG(string arguments, MediaFileWrapper processMediaFile)
    {
        startTime = DateTime.Now;
        watch = new Stopwatch();
        watch.Start();
        progressBar1.Minimum = 0;
        progressBar1.Maximum = processMediaFile.GetTotalMilliseconds();

        // Start the child process.
        p = new Process();

        //Setup filename and arguments
        outputWindow.AppendText("ffmpeg " + arguments);
        p.StartInfo.Arguments = arguments;
        p.StartInfo.FileName = "ffmpeg.exe";
        p.StartInfo.UseShellExecute = false;

        // Redirect the output stream of the child process.
        p.StartInfo.RedirectStandardOutput = true;
        p.StartInfo.RedirectStandardError = true;
        p.StartInfo.RedirectStandardInput = true;

        // capture the date for stdout and std error
        // note FFMPEG uses Stderr exclusively
        p.ErrorDataReceived += new DataReceivedEventHandler(ErrorDataReceived);
        p.OutputDataReceived += new DataReceivedEventHandler(OutputDataReceived);

        // Hide Console Window
        p.StartInfo.CreateNoWindow = true;
        p.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;

        p.Start();
        p.BeginErrorReadLine();
        p.BeginOutputReadLine();
        await p.WaitForExitAsync();
    }


  



  and WaitForExitAsync is in another class because in can not be in here with a Form

  



      public static Task WaitForExitAsync(this Process process,
        CancellationToken cancellationToken = default(CancellationToken))
    {
        var tcs = new TaskCompletionSource();
        process.EnableRaisingEvents = true;
        process.Exited += (sender, args) => tcs.TrySetResult(null);
        if (cancellationToken != default(CancellationToken))
            cancellationToken.Register(tcs.SetCanceled);

        return tcs.Task;
    }


  



  however, single files work fine, when I call a directory through, it continuously starts processes for each file, trying to run them all at the same time. You can see I tried implementing this 
process.WaitForExit() asynchronously
with no luck.