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• Fallback input for ffmpeg

  22 septembre 2018, par Daniel Cantarin

  I’m doing some transcoding from a third-party remote input stream that I do not control.

  This input stream has errors from time to time, that I would like to mitigate before sending the stream to my transcoding pipeline, avoiding this way some possible problems in the output.

  I have several ideas regarding different problems. But the most basic scenario I would like to set up is as follows : when the stream is down, or it somehow loses some frames, I want to fill that video gap with a secondary input (like a blank screen, for example).

  For this simple task, I would like to use ffmpeg. I know it can mix, let’s say, an input stream with a fullscreen black square static image. However, I have to deal with this other condition : ffmpeg would run in the same infraestructure for the actual transcoding pipeline. That infraestructure must use its computing power for rendering the output. So, whatever ffmpeg command I end up using should use the minimum possible computing power.

  My actual problem : if I use -vcodec copy, in order to use minimum CPU, I can’t alter the original stream. But if I alter the original stream (by mixing it with some other stream), the operation uses CPU.

  My question : Is there a way to use -vcodec copy, but with a fallback input (instead of a mixed one) for when there are video gaps in the primary stream ?

  Thanks in advance.

• How to write data captured from Debug Console to a textBox in WinForms ? [closed]

  2 avril 2020, par Serhat Çelik

  I run a basic FFmpeg command and tried to capture live output like below :

  



  private void button1_Click(object sender, EventArgs e)
{
            using (Process ffmpeg = new Process())
            {

                ffmpeg.StartInfo.UseShellExecute = false;
                ffmpeg.StartInfo.CreateNoWindow = true;
                ffmpeg.StartInfo.RedirectStandardOutput = true;
                ffmpeg.StartInfo.RedirectStandardError = true;
                ffmpeg.StartInfo.RedirectStandardInput = true;

                ffmpeg.StartInfo.FileName = "ffmpeg.exe";
                ffmpeg.StartInfo.Arguments = $"-v quiet -stats -y -i C:\\Users\\user\\in.mp4 C:\\Users\\user\\out.mkv";

                ffmpeg.EnableRaisingEvents = true;
                ffmpeg.OutputDataReceived += (s, ea) => { Debug.WriteLine($"STD: {ea.Data}"); };
                ffmpeg.ErrorDataReceived += (s, ea) => { Debug.WriteLine($"ERR: {ea.Data}"); };
                ffmpeg.Start();
                ffmpeg.BeginOutputReadLine();
                ffmpeg.BeginErrorReadLine();
                ffpeg.WaitForExit();

                 // What to do after that? Like:
                   // string str; textBox1.Text = str
           }
}


  



  I am so confused that I cannot figured it out. Please help, thanks.

  


• Create a looped video with countdown

  13 décembre 2016, par Enrico Deleo

  Something maybe challenging here :
  I want to stream (via rtmp) a video with a fixed image and a countdown applied on it. I know I can create a slideshow with even audio background with ffmtp (http://trac.ffmpeg.org/wiki/Create%20a%20video%20slideshow%20from%20images) but I’m wondering if I can loop it AND apply an overlay with the countdown to a given date.

  Any ideas ?