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• FFMPEG reads fps of input h264 file wrong, resulting in wrong duration of output file

  20 janvier 2015, par JolJols

  I am trying to convert an .h264 file created with python from an incoming stream to xvid format with ffmpeg.

  The file is 30min long and 12fps. However, the converted file automatically creates a file that is 25fps and thus 14.4min long. If I set fps like ffmpeg -i test.h264 -r 12 test.avi it creates a video of 14.4min long with a fps of 12.

  How can I set it to see the incoming video as 12fps ? I tried recording immediately in xvid coded in python using FOURCC but on mac OS X the only codec that seems to work is mp4v. I also tried using MP4Box, which creates the right video duration and fps but for which I cannot set it to the xvid coded (which I need).

• Handling "NullReferenceException" when executing "ffmpeg.exe" process in C# [duplicate]

  1er juillet 2023, par FrostDream

  I'm trying to execute the "ffmpeg.exe" process in my C# application to process media files. However, I'm encountering a "NullReferenceException" when running the code. I've tried various approaches, including using a try-catch block, but the exception still persists. Here's the relevant code snippet :

  


  bool isValidMedia = true;

try
{
    Process process = new Process();
    process.StartInfo.FileName = "ffmpeg.exe";
    process.StartInfo.Arguments = $"-i \"{file}\" -f null -";
    process.StartInfo.UseShellExecute = false;
    process.StartInfo.RedirectStandardOutput = true;
    process.StartInfo.CreateNoWindow = true;
    process.OutputDataReceived += (sender, e) =>
    {
        if (!string.IsNullOrEmpty(e.Data))
        {
            int startIndex = e.Data.IndexOf("samples=") + 8;
            button.Width = int.Parse(e.Data.Substring(startIndex, e.Data.IndexOf(" ") - startIndex)) / zoom * 100;
        }
        else
        {
            isValidMedia = false;
        }
    };

    process.Start();
    process.BeginOutputReadLine();
    process.WaitForExit();
}
catch
{
    isValidMedia = false;
}

if (!isValidMedia)
{
    MessageBox.Show("Not a valid media.");
    return;
}



  


  I suspect that the issue may be related to the asynchronous execution of the event handler or the initialization of the ProcessStartInfo object. Can anyone please help me identify the cause of the "NullReferenceException" and provide guidance on how to resolve it ? Thank you in advance for your assistance.

  


• Revision 36eeb1799d : Merge "Revert "Revert 3 patches from Hangyu to get Chrome to build :""

  25 juin 2014, par hkuang

  Merge "Revert "Revert 3 patches from Hangyu to get Chrome to build :""