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• Calling FFMPEG Commands via Windows Service

  2 février 2017, par Kubi

  I have a windows service and I checked the "Allow service to interact with desktop" checkbox in LogOn tab. However, I still can not call my batch file which is a basic command app to run the ffmpeg commands to transcode some videos in my application. (I’m sending arguments as well)

  I checked the logs in Process Monitor but everything seems fine when I filter it with MyServiceName.exe. All threads are looking fine but the service can not even start the command file.

  If I can not find a solution for this, I’m going to create another service and communicate with each other about the transcoding process, But I’m looking for a way to find the exact problem here.

          BinaryPath = @"c:\Transcoder\ServiceConsole.exe";
  
          //create a process info
  
          ProcessStartInfo oInfo = new ProcessStartInfo(BinaryPath, " /readfromfile command.txt");
  
          oInfo.UseShellExecute = false;
  
          oInfo.CreateNoWindow = true;
  
          oInfo.RedirectStandardOutput = true;
  
          oInfo.RedirectStandardError = true;
  
          string output = null; StreamReader srOutput = null;
  
  
  
          try
  
          {
  
              Process proc = System.Diagnostics.Process.Start(oInfo); 
  
  
  
              proc.WaitForExit();
  
  
  
              //get the output
  
              srOutput = proc.StandardError;
  
  
  
              //now put it in a string
  
              output = srOutput.ReadToEnd();
  
  
  
              proc.Close();
  
          }

• FFmpeg : Add alpha channel to a video using a PNG mask

  7 avril 2016, par Rodrigo Polo

  I saw that FFmpeg can merge/blend two videos with alpha channel and can encode video with alpha channel using the qtrle codec, but, It is possible to apply a PNG file mask, either a black and white or a PNG with an alpha channel to a video in order to have a video with the alpha channel of the PNG applied ?

  Here is the concept in images

  Original video :
  

  PNG file with alpha channel, the "mask" :
  

  And the result :
  

  Or even a black and white image as a mask for alpha channel :
  

  Any help would be appreciated, thank you !

• mpeg12enc : Correctly mask dimensions

  7 janvier 2013, par Michael Niedermayer

  mpeg12enc : Correctly mask dimensions