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• How to dynamically save a video with ffmpeg without stopping recording ?

  11 janvier 2023, par MP_95

  I am trying to save a video using ffmpeg with image input from an http webservice. I was able to create the video with the command :
ffmpeg -i http://source -c:v libx264 -r 30 -preset ultrafast -updatefirst 1 -y output.mp4.

  


  However, the video is only actually made available when I stop recording.
Is there a procedure that would allow me to have the video available while recording as is the case using OpenCv's VideoWriter

  


• Using FFMpeg to save an rtsp stream from a certain point in time

  14 août 2013, par Nir

  I would like to use FFMpeg to save a live stream from a certain offset. For example, "from timestamp 00:05 to 00:12".

  I know how to dump the stream to file (ffmpeg -i rtsp ://SRC -r 15 C :/file.mp4), the catch is how to clip it to the givem timestamp, if possible.

  Thanks !

• Can't save process's output stream to file

  10 octobre 2018, par Wahid Masud

  I’m using ffmpeg.exe as a process and output the converted video to memory, then from memory I’m saving the data to a video file (this is the requirement I can’t directly save the converted video to a file). But the conversion is not working for some reason, Here is what I’ve tried,

  var ffmpeg = HttpContext.Current.Server.MapPath("~/FFMpeg/ffmpeg.exe");
  
  var outputDir = HttpContext.Current.Server.MapPath("~/Uploads/converted.mp4");
  
  var inputDir = "https://www.sample-videos.com/video/mp4/720/big_buck_bunny_720p_10mb.mp4";
  
  var args = "-i " + inputDir + " -c:v libx264 -preset veryslow -crf 26 " +
  
              "-ar 44100 -ac 2 -c:a aac -strict -2 -b:a 128k -";
  
  
  
  var process = new Process();
  
  process.StartInfo.UseShellExecute = false;
  
  process.StartInfo.FileName = ffmpeg;
  
  process.StartInfo.WorkingDirectory = ffmpeg.Replace("\\ffmpeg.exe", "");
  
  process.StartInfo.Arguments = args;
  
  process.StartInfo.RedirectStandardOutput = true;
  
  process.Start();
  
  process.EnableRaisingEvents = true;
  
  //process.WaitForExit();
  
  Stream output = process.StandardOutput.BaseStream;
  
  process.Exited += (sender, e) =>
  
  {
  
      using (var fileStream = File.Create(outputDir))
  
      {
  
          output.Seek(0, SeekOrigin.Begin);
  
          output.CopyTo(fileStream);
  
      }
  
  };  

  The output file converted.mp4 is created but its 0 kb.