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• FFmpeg send multiple inputs through a stream

  18 janvier 2023, par Stiven Diplet

  I have the following code that passes data to the ffmpeg process through a thread.

  


  public void VideoToImages3()
{
    var inputFile = @"C:\testvideo.avi";
    var outputFile = @"C:\outputFile.mp4";

    var process = new Process
    {
        StartInfo = new ProcessStartInfo
        {
            RedirectStandardInput = true,
            UseShellExecute = false,
            CreateNoWindow = true,
            Arguments = $"-y -i - {outputFile}",
            FileName = _ffmpeg
        },
        EnableRaisingEvents = true
    };

    process.Start();

    //Write input data to input stream
    var inputTask = Task.Run(() =>
    {
        using (var input = new FileStream(inputFile, FileMode.Open))
        {
            input.CopyTo(process.StandardInput.BaseStream);
        }
    });

    Task.WaitAll(inputTask);

    process.WaitForExit();
}


  


  In this case, I only upload 1 file through the stream (-i -). What if I need to stream multiple input files (-i - -i -). For example, when adding an Audio File to a Video File ?

  


  "ffmpeg -y -i {audioFilePath} -i {videoFilePath} {outputFilePath}"


  


  How to transfer files via StandardInput if 2 input arguments are specified ???

  


  I can't find a solution

  


• How disable keyinput for ffplay/ffmpeg ? [on hold]

  21 juillet 2018, par Los Pollos Hermanos

  Code for open & play custom video (.mp4) file in new window without form border with audio using ffplay.exe

      ffplay = new Process();
  
      ffplay.StartInfo.FileName = @"ffmpeg\bin\ffplay.exe";
  
      ffplay.StartInfo.EnvironmentVariables.Add("SDL_AUDIODRIVER", "directsound");
  
      ffplay.StartInfo.Arguments = "-noborder -autoexit -i movie.mp4";
  
      ffplay.StartInfo.CreateNoWindow = true;
  
      ffplay.StartInfo.RedirectStandardOutput = true;
  
      ffplay.StartInfo.UseShellExecute = false;
  
      ffplay.EnableRaisingEvents = true;
  
      ffplay.Start();

  This code works ok, but I need disable or intercept any keycontrol of video player, it needs for implementing player into my form. I did not find anything about this on ffplay documentation.

  Here is documentation for using ffplay : While playing/keycontrol

• How to make WMV streamable ?

  19 janvier 2013, par forthrin

  How can I make WMV stream from a HTML page on a remote server into Internet Explorer ? (Without using HTML 5 video or Flash)

  I use the following FFMPEG :

  ffmpeg -i video.mp4 -b 2000k -vcodec wmv2 -acodec wmav2 video.wmv

  And the following HTML :

  Yet the video player insists on loading the whole video before it starts to play it. How do I make it start playing when it's buffered enough ?

  Update : The important parameter seems to be the classid value :

  Please post a comment if you know about other ways to make the streaming work than including the quirky classid value.