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• Converting video mp4 file to gif file in asp.net ?

  14 juillet 2018, par Jonny

  I am developing an web app in asp.net where I want to convert mp4 file to animated gif file. I created a sample in C# console app to test my logic where it worked smoothly but when I tried to implement the same logic in asp.net it is not working.

  I am using FFmpeg.exe to convert the videos.
  Here is my code that executes on Button Click. Any help would be appreciated.

  try
  
  {
  
      //srcLink = Session["videoPath"].ToString();
  
      System.Diagnostics.Process grabInfoProcess;
  
      grabInfoProcess = new System.Diagnostics.Process();
  
      grabInfoProcess.StartInfo.UseShellExecute = false;
  
      grabInfoProcess.StartInfo.RedirectStandardOutput = true;
  
      grabInfoProcess.StartInfo.RedirectStandardError = true;
  
      grabInfoProcess.StartInfo.CreateNoWindow = true;
  
      grabInfoProcess.StartInfo.FileName = Request.PhysicalApplicationPath + "FFmpeg\\ffmpeg.exe";
  
      grabInfoProcess.StartInfo.Arguments = "-ss 00:00:01 -t 00:00:15" + " -i " + Request.PhysicalApplicationPath + "videos\\test2.mp4" + " " + Request.PhysicalApplicationPath + "DestVideos\\animated.gif";
  
      //ffmpeg - i source_video.avi animated_gif.gif
  
      grabInfoProcess.Start();
  
      string output = grabInfoProcess.StandardOutput.ReadToEnd();
  
      string newoutput = grabInfoProcess.StandardError.ReadToEnd();
  
      grabInfoProcess.WaitForExit();
  
  
  
  }
  
  catch (Exception ex)
  
  {
  
      Page.ClientScript.RegisterStartupScript(this.GetType(), "scriptkey", "alert('" + ex.Message.ToString() + "');");
  
  }

• How to change part of a MKV video with another MKV video without re-encode and without changing audio file of the primary MKV file [closed]

  10 octobre 2020, par MonsterMMORPG

  I have a lecture that I have recorded with using OBS studio and my microphone

  


  But I want to replace certain part of that video with another video without re-encoding or touching the audio

  


  The another video is also recorded with OBS studio with the same settings

  


  If encoding is necessary I accept that as well

  


  So what would be the appropriate ffmpeg command ?

  


  Here example file definitions and durations to give more clear example

  


  


  • a.mkv : 77 minutes long

    


  


  • b.mkv : same format and 2 minutes long

    


  


  • c.mkv : I want to replace 00.23.00 - 00.25.00 part of a.mkv with b.mkv without changing the audio file of a.mkv

    


  


  


  Is this possible without encoding or with re-encoding ?

  


  So can you provide an example code with some definitions

  


  How do we define starting position, the durations ? I found some examples on the Internet but they were not definitive enough

  


  Answer to this question : https://superuser.com/questions/1591877/how-to-change-part-of-a-mkv-video-with-another-mkv-video-without-re-encode-and-w

  


• How can I convert WebM file to WebP file ?

  24 août 2020, par c-an

  I tried it with ffmpeg.

  


  ffmpeg input.webm output.webp


  


  input.webm contains transparent background and But the alpha channel becomes white in webp. I think that means alpha channel doesn't come together.

  


  I extracted frames with this command :

  


  ffmpeg -i input.xxx -c:v libwebp output_%03d.webp


  


  And it also gives me webp files with white background.

  


  How can I convert it properly with alpha channel ? OR should I convert it from other format(extension) ?