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• C# console app to process FFMPEG jpg stream output

  15 septembre 2014, par Gabriel Barzola

  I am looking some tip or idea in order to process an stream of jpg files created by a fFMPEG command.

  There is a way to split the outpuStream to capture each jpg file?

  Here is the command ffmpeg -i rtsp://somertsp:554 -an -f image2pipe -vf fps=fps=5 -

  I execute that command using a C# application.

  Here is a example code

  class Program
  {
      private static BackgroundWorker worker;
      private static MemoryStream buffer = new MemoryStream();
      private static BinaryWriter bufferWriter = new BinaryWriter(buffer);
  
      static void Main(string[] args)
      {
          string file = @"C:\ffmpeg\bin\ffmpeg.exe";
          string arguments = @"-i rtsp://xxx:yyy@v5demo.wavestore.com:554/rtsp/00004 -an -f image2pipe -vf fps=fps=5 -qscale 0 -";
  
          var processStartInfo = new ProcessStartInfo(file, arguments);
          processStartInfo.CreateNoWindow = false;
          processStartInfo.RedirectStandardError = true;
          processStartInfo.RedirectStandardOutput = true;
          processStartInfo.UseShellExecute = false;
  
          worker = new BackgroundWorker();
          worker.DoWork += worker_DoWork;
          worker.WorkerReportsProgress = true;
          worker.ProgressChanged += worker_ProgressChanged;
  
          var process = new Process();
          process.StartInfo = processStartInfo;
          process.Start();
  
          worker.RunWorkerAsync(process);
          process.WaitForExit();
  
      }
  
      static void worker_ProgressChanged(object sender, ProgressChangedEventArgs e)
      {
          // save the image
      }
  
      static void worker_DoWork(object sender, DoWorkEventArgs e)
      {
          try
          {
  
              var internalWorker = sender as BackgroundWorker;
              Process p = e.Argument as Process;
              buffer = new MemoryStream();
              bufferWriter = new BinaryWriter(buffer);
              using (var reader = new BinaryReader(p.StandardOutput.BaseStream))
              {
                  while (true)
                  {
                     //get the jpg image
                  }
              }
  
          }
          catch (Exception ex)
          {
            // Log the error, continue processing the live stream
          }
      }        
  }
  

• How can i create ffmpeg code with video and audio filter in one command line

  15 septembre 2014, par aligokayduman

  i can add a background image behind the video and change scale and position with this code

  ffmpeg -loop 1 -i 360.png -i input.mp4 -filter_complex "[1]scale=362:218[over]; [0][over]overlay=200:117" -shortest -y output.mp4
  

  and i can change audio and volume speed %10 faster

   ffmpeg -i input.mp4 -filter_complex "[0:v]setpts=0.9*PTS[v]; [0:a]atempo=1.1[a]" -map "[v]" -map "[a]" output.mp4
  

  i wanna do this 2 step in one code but i couldn't do that

  Do you know any solution?

• Get video thumbnail on a shared hosting without FFMPEG

  15 septembre 2014, par SharpAffair

  Looking for a solution to extract thumbnail from an MP4 video, I found several results here, but they involve using FFMPEG.

  Unfortunately, running FFMPEG's EXE file is unavailable in a shared hosting environment.

  Is there any alternative, e.g. a .NET Framework solution or an external .NET DLL to meet the same goal?

• avconv or FFMPEG command to have multiple pictures slices from a direct webcam on pc

  15 septembre 2014, par user3162862

  I have found the command

  ffmpeg -i rtsp://10.2.69.201:554/ch0_0.h264 -f image2 -vf fps=fps=1/120 img%03d.jpg
  

  but it fail if I'm not on network. I tryed on my on computer but I have bind error. I would like to have a command like or a mix of these one:

  ffmpeg -f v4l2 -s 640x480 -i /dev/video0 output.mpg
  

  Thanks for your help. This is appreciated if that possible

• ffmpeg : convert and keep audio tracks

  14 septembre 2014, par raxer

  i have some video files in H.264 codec and DTS audio. My goal is to convert the audio tracks (mostly 2 tracks, english and german) to AAC, but i don't want to lose the DTS audio tracks.

  I tried this command, but it only converts the tracks and replaces the DTS tracks

  ffmpeg -i input.mkv -map 0 -c:v copy -c:a libfdk_aac -b:a 128k -c:s mov_text output.mp4
  

  What should i do to have the DTS and AAC tracks in the output file?