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• Place two videos side by side using ffmpeg ?and download it as one file

  5 août 2019, par marceloo1223

  I have two video files, which I want to play side by side and download them later. I used FFMPEG to merge them as one :

  protected void combinetwovideo()
  
  {
  
      string strParam;
  
      string Path_FFMPEG = Path.Combine(HttpContext.Current.Server.MapPath(ConfigurationManager.AppSettings["FFMpegPath"]));
  
      string apppath=HttpRuntime.AppDomainAppPath;
  
      //Merging two videos               
  
      String video1=apppath+"\\recordings\\client2019-08-03 02_23_59";
  
      String video2 =apppath+"\\userrecord\\User2019-08-03 02_24_00";
  
      String strResult =apppath+"\\RESULT\\";
  
      strParam = string.Format("-i ('" + video1 + "') -i ('" + video2 + "') -filter_complex \'[0:v]pad=iw*2:ih[int];[int][1:v]overlay=W/2:0[vid]' /-map [vid] -c:v libx264 -crf 23 -preset veryfast output.mp4");
  
      process(Path_FFMPEG, strParam);
  
  }

   public void process(string Path_FFMPEG, string strParam)
  
   {
  
      try
  
      {
  
          Process ffmpeg = new Process();
  
          ProcessStartInfo ffmpeg_StartInfo = new ProcessStartInfo(Path_FFMPEG, strParam);
  
          ffmpeg_StartInfo.UseShellExecute = false;
  
          ffmpeg_StartInfo.RedirectStandardError = true;
  
          ffmpeg_StartInfo.RedirectStandardOutput = true;
  
          ffmpeg.StartInfo = ffmpeg_StartInfo;
  
          ffmpeg_StartInfo.CreateNoWindow = true;
  
          ffmpeg.EnableRaisingEvents = true;
  
          ffmpeg.Start();
  
          ffmpeg.WaitForExit();
  
          ffmpeg.Close();
  
          ffmpeg.Dispose();
  
          ffmpeg = null;
  
      }
  
      catch (Exception ex)
  
      {
  
      }
  
  }

  But this method outputs nothing and does not throw any errors. I’m confused about the strParam query. Did I write it wrong or am I missing something. Any help would be apreciated.

• ffmpeg how to place still image over full vstack ?

  21 août 2020, par mtareiling

  Im trying to build a simple video editor and im using ffmpeg on the background. I want as much different filters/properties in one command but im not succeeding in placing a still image before everything else (first frame). I want a vstack after the image has shown in a video.

  



  I tried a lot of different commands etc. and most of the time the video renders but the image included in the vstack, or the video doesn't start for the amount of seconds I want the still image to be shown.

  



  ffmpeg -hide_banner -i "header.jpg" -i "video.mp4" -i "footer" -i "still-image.jpg" -filter_complex "[1][3]overlay=0:0:enable='between(t,0,4)';vstack=inputs=3" -pix_fmt yuv420p -c:a copy -y output.mp4

  



  Most of the time I don't get an error. It just isn't doing what's expected. The above command is one of the many I tried but is basically what I want. Can someone help please ?

  


• problem with linking macos library - version number on wrong place

  21 novembre 2019, par freedev

  This is it seems a stupid problem.

  Basically I’m building a python wheel, I have everything and the build already works on linux.
  But when I’m trying to build on macos I have this strange error :

  *** No rule to make target `/usr/local/Cellar/ffmpeg/4.2.1_2/lib/libavutil.dylib.56’

  Looking at /usr/local/Cellar/ffmpeg/4.2.1_2/lib/ I see exists a file named :

  /usr/local/Cellar/ffmpeg/4.2.1_2/lib/libavutil.56.dylib

  You see, the difference is only in the name. The former has the number at end, the latter has the number in the middle.

  If I create a symbolic link from libavutil.56.dylib to libavutil.dylib.56 the linking complete successfully.

  Does anyone know why this is happening and how to solve this problem ?