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• How to get output from ffmpeg process in c#

  13 juillet 2018, par Anirudha Gupta

  In the code I written in WPF, I run some filter in FFmpeg, If I run the command in terminal (PowerShell or cmd prompt) It will give me information line by line what’s going on.

  I am calling the process from C# code and it’s work fine. The problem I have with my code is actually I am not able to get any output from the process I run.

  I have tried some answers from StackOverflow for FFmpeg process. I see 2 opportunities in my code. I can either fix it by Timer approach or secondly hook an event to OutputDataReceived.

  I tried OutputDataReceived event, My code never got it worked. I tried Timer Approach but still, it’s not hitting my code. Please check the code below

          _process = new Process
  
          {
  
              StartInfo = new ProcessStartInfo
  
              {
  
                  FileName = ffmpeg,
  
                  Arguments = arguments,
  
                  UseShellExecute = false,
  
                  RedirectStandardOutput = true,
  
                  RedirectStandardError = true,
  
                  CreateNoWindow = true,
  
              },
  
              EnableRaisingEvents = true
  
          };
  
  
  
          _process.OutputDataReceived += Proc_OutputDataReceived;
  
  
  
          _process.Exited += (a, b) =>
  
          {
  
              System.Threading.Tasks.Task.Run(() =>
  
              {
  
                  System.Threading.Tasks.Task.Delay(5000);
  
                  System.IO.File.Delete(newName);
  
              });
  
  
  
              //System.IO.File.Delete()
  
          };
  
  
  
          _process.Start();
  
          _timer = new Timer();
  
          _timer.Interval = 500;
  
          _timer.Start();
  
          _timer.Tick += Timer_Tick;
  
      }
  
  
  
  
  
      private void Timer_Tick(object sender, EventArgs e)
  
      {
  
          while (_process.StandardOutput.EndOfStream)
  
          {
  
             string line = _process.StandardOutput.ReadLine();
  
          }
  
          // Check the process.
  
  
  
      }

• Force ffmpeg to generate WebVTT for each subtitle track

  14 juin 2018, par Rogue

  I use the following ffmpeg command to generate an HLS stream from a video :

  ffmpeg -i pipe:0 \
  
      -y -b:a 64k -acodec aac -vcodec copy \
  
      -hls_time 10 -hls_playlist_type vod -start_number 0 -hls_base_url http://127.0.0.1:5000/ -hls_list_size 0 \
  
      -f hls -crf 20 -hls_flags split_by_time -force_key_frames "expr:gte(t,n_forced*3)"\
  
      -threads 4 \
  
      target/stream.m3u8

  It works perfectly, and to my pleasure and surprise ffmpeg generates a second m3u8 file corresponding to the subtitles that are embeded in the video file, with the appropriate .vtt files.
  The problem is that when i input a video file with more than one subtitle tracks, i only get files for the first one.
  How can i force ffmpeg to output ALL tracks as m3u8 / .vtt files ?

  Thanks a lot

• ffmpeg multiple filters need assistance

  16 mars 2018, par Tony Hanna

  I have one movie .mp4, one logo .png and one text (banner) sliding in the bottom, and I need to add subtitles. I’m trying this with complex filters but always with an error. Please help.

  ffmpeg.exe -re -i wonder.mp4 -i logo72.png -filter_complex "[0:v]drawtext=fontcolor=white:fontsize=32:fontfile='C:\Windows\Fonts\arial.ttf':textfile='d:\banner.txt':reload=1:y=h-line_h:x=w-(mod(n*3\,w+tw)-tw/40),drawbox=y=ih-40:color=black@0.4:width=iw:height=40:t=max[text];[text][1:v]overlay=15:15[filtered];[0:v][1:v]overlay=0:0,subtitles=subtitle.srt[out]" -map "[filtered]" - map "[out]" -map 0:a -codec:v libx264 -codec:a copy -f mpegts udp://10.10.10.4:5000?pkt_size=1316

  What am I doing wrong ?