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• Video ; Zoom to different points with a single render (?)

  31 mai 2021, par RewossKy

  Based on 16 seconds, I want the codes to zoom to the top left for the first 4 seconds, to the bottom left for the next 4 seconds, to the top right for the next 4 seconds, and then to the bottom right for 4 seconds.

  


  Structurally, the codes are ready, but I need small details, I want to render them in one go (without rendering 4 times) and focus every 4 seconds elsewhere.

  


  If you can help me I would be very happy. I couldn't figure it out for days.

  


  'Top left
ffmpeg -y -i input.mp4 -vf "zoompan=z='if(lte(mod(time,16),4),2,1.05)':d=1:x=iw/3-(iw/zoom/2):y=ih/3-(ih/zoom/2):fps=29.97" output.mp4

  


  Top right
ffmpeg -y -i input.mp4 -vf "zoompan=z='if(lte(mod(time,16),4),2,1.05)':d=1:x=iw/1-(iw/zoom/2):y=ih/3-(ih/zoom/2):fps=29.97" output.mp4

  


  Bottom left
ffmpeg -y -i input.mp4 -vf "zoompan=z='if(lte(mod(time,16),4),2,1.05)':d=1:x=iw/2-(iw/zoom/1):y=ih/1-(ih/zoom/1):fps=29.97" output.mp4

  


  Bottom right
ffmpeg -y -i input.mp4 -vf "zoompan=z='if(lte(mod(time,16),4),2,1.05)':d=1:x=iw/1-(iw/zoom/2):y=ih/1-(ih/zoom/2):fps=29.97" output.mp4'

  


• The `Process` does not start with the special characters in the process argument

  21 septembre 2015, par Mitra M

  I can run FFmpeg.exe -i test.flv -f flv - | ffplay -i - in the cmd, But I can’t run it in the c# codes when "|" is in argument.

  This code works :

    Process process = new Process();
  
    process process .StartInfo.FileName = "FFmpeg.exe";
  
    process process .StartInfo.Arguments =" -i test.flv "
  
    process .Start();

  But this code is not working :

    Process process = new Process();
  
    process process .StartInfo.FileName = "FFmpeg.exe";
  
    process process .StartInfo.Arguments =" -i test.flv -f flv - | ffplay -i -"
  
    process .Start();

  I tried this codes but did not effect :

     process process .StartInfo.Arguments =" -i test.flv -f flv - \| ffplay -i -"
  
  
  
     process process .StartInfo.Arguments =" -i test.flv -f flv - \\| ffplay -i -"
  
  
  
     process process .StartInfo.Arguments =@" -i test.flv -f flv - | ffplay -i -"
  
  
  
     process process .StartInfo.Arguments ="\" -i test.flv -f flv - \| ffplay -i -\""

  Please tell me how can I run FFmpeg.exe -i test.flv -f flv - | ffplay -i - in the C# codes.

• How to use FFMPEG to add different pictures into one video

  24 juillet 2012, par user1546926

  What I want to do is to display different pictures on specific time periods of the video.

  I have got a solution which is using FFMPEG to split the video into several components and then adding pictures as watermark into those components, and finally join them together.

  However, I don't think it is very efficient when tackling with large videos.

  Any idea ? doesn't need to be done in a single command, could even be a script. thanks in advance.

  this is what I did :

  Codes for adding watermark

  ffmpeg -ss 00:00:00 -t 00:01:30 -i test.mpg -vf "movie=logo1.png [watermark];[in]
  
  [watermark] overlay= main_w-overlay_w-10:main_h-overlay_h-10 [out]" -vcodec flv -sameq out1.avi
  
  
  
  ffmpeg -ss 00:01:30 -t 00:03:00 -i test.mpg -vf "movie=logo2.png [watermark];[in]
  
  [watermark] overlay= main_w-overlay_w-10:main_h-overlay_h-10 [out]" -vcodec flv -sameq out2.avi

  Codes for joining avi(running on Windows)

  copy out1.avi /b + out2.avi /b output.avi /b