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• How to get success info from ffmpeg on C# ?

  13 mars 2014, par user2989391

  I using ffmpeg on C#, my argument worked fine but i don't know get success handle..
  Sorry for my bad English.
  Thank you for help.

      ProcessStartInfo psi = new ProcessStartInfo("bin\\ffmpeg.exe");
  
      Process proc = Process.Start(psi);
  
      psi.UseShellExecute = false;
  
      psi.CreateNoWindow = true;
  
      psi.Arguments = " My argument ";
  
      psi.RedirectStandardError = true;
  
      psi.WindowStyle = ProcessWindowStyle.Hidden;
  
      proc = Process.Start(psi);
  
      StringBuilder sb = new StringBuilder();
  
      StreamReader outputReader = proc.StandardOutput;
  
      while (!(proc.StandardOutput.EndOfStream)) {
  
          sb.AppendLine(proc.StandardOutput.ReadLine());
  
      }
  
      proc.WaitForExit();
  
      proc.Close();
  
      psi = null;

• ffmpeg OSError : [WinError 6] The handle is invalid when converted to exe

  13 septembre 2021, par thewayman

  I am trying to merge a video file with an audio file, using FFmpeg. It work fine when I am testing it but when I make an exe file via pyinstaller and including the FFmpeg.exe inside there is a peculiar error I am getting.

  


  


  OSError : [WinError 6] The handle is invalid

  


  


  This only happens when I set the FFmpeg run(quiet=True) but when I set the quiet=False everything works fine. The only problem is it shows the output window of FFmpeg.

  


  if getattr(sys, 'frozen', False):
   application_path = sys._MEIPASS
elif __file__:
   application_path = os.path.dirname(__file__)
ffmpegName = 'ffmpeg.exe'
ffmpegPath = os.path.join(application_path, ffmpegName)
video_stream = ffmpeg.input(file[0])
audio_stream = ffmpeg.input(file[1])
ffmpeg.output(audio_stream, video_stream, path).run(overwrite_output=True,
              cmd=ffmpegPath, quiet=True) #setting quiet=false everything works fine.


  


  Can anyone explain what's happening here ?
(Note the code is running in a different thread.)

  


• pyav / ffmpeg / libav select number of P-frames and B-frames

  27 mai 2021, par user1315621

  I am streaming from an rtsp source. It looks like half of the frames received are key frames. Is there a way to reduce this percentage and have an higher number of P-frames and B-frames ? If possible, I would like to increase the number of P-frames (not the one of B-frames).
I am using pyav which is a Python wrapper for libav (ffmpeg)

  


  Code :

  


  container = av.open(
    url, 'r',
    options={
        'rtsp_transport': 'tcp',
        'stimeout': '5000000',
        'max_delay': '5000000',
    }
)
stream = container.streams.video[0]
codec_context = stream.codec_context
codec_context.export_mvs = True
codec_context.gop_size = 25  

for packet in self.container.demux(video=0):
    for video_frame in packet.decode():
        print(video_frame.is_key_frame)


  


  Output :

  


  True
False
True
False
...


  


  Note 1 : I can't edit the source. I can just edit the code used to stream the video.

  


  Note 2 : same solution should apply to pyav, libavi and ffmpeg.

  


  Edit : it seems that B-frames are disabled : codec_context.has_b_frames is False