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• FFMPEG hold multiple frames and use as a movie

  18 juin 2019, par Cole

  I have a video that I’m trying to create jump shots from. For example I want the output of my command to show frame 5 of the original clip for 30 frames, and frame 25 of the OG clip to show for 30 frames.

  assuming the OG clip is 30 FPS

  ffmpeg -t 1 -i og_clip.mp4 -filter_complex "
  
      [0]select=eq(n\,5)[H1];[0][H1]overlay[O1];
  
      [0]select=eq(n\,25)[H2];[0][H2]overlay[O2];
  
      [O1][O2]concat=n=2[Merge]" -map "[Merge]" out.mp4

  The above doesnt work right.

  What I’ve been doing up until now has been a two part command :

  ffmpeg -i og_clip.mp4 -vf "select=eq(n\,5)" -vframes 1 -y out_0.png
  
  ffmpeg -i og_clip.mp4 -vf "select=eq(n\,25)" -vframes 1 -y out_1.png
  
  ffmpeg -t 1 -i og_clip.mp4 -i out_0.png -i out_1.png -filter_complex "
  
      [0][1]overlay[H1];[0][2]overlay[H2];
  
      [H1][H2]concat=n=2[Merge]" -map "[Merge]" out.mp4

  Which has been working for me. The only problem is that the process of converting to a png first for each frame I want to use, takes too long. I’m trying to condense it all into one command. I figure that the encoding of the png is what takes so long.

  Any help would be much appreciated !

• Animated watermark moving on the edges of the movie - ffmpeg

  25 février, par saeid ezzati

  I wanna overlay a picture on a video, as a watermark. How do I insert an animated watermark that randomly moves from side to side.

  



  For example, 
A watermark, placed on top/ upper-left corner, moves randomly to the top/upper-right corner and freezes there for five seconds before moving down to the lower- right corner.

  



  I don't want the watermark to have a cross movement and move from the upper-right corner to the lower-left corner.

  



  Here is an example of my code, using which the watermark randomly jumps to a corner each 200 frames without animate :

  



  ffmpeg -i "source.mp4" -i "watermark.png" -filter_complex "[1:v]scale=50:-1[a]; [0:v][a]overlay=x='st(0,floor(random(n)*2)+1);if(eq(mod(n-1,200),0), if(eq(ld(0),1),0,  main_w-overlay_w   ) ,x)':y='st(0,floor(random(n)*2)+1);if(eq(mod(n-1,200),0),if(eq(ld(0),1),0,  main_h-overlay_h   ),y)'" -codec:a copy "out.mp4"


  


• create movie from one image updates in linux

  27 novembre 2019, par milad

  I’m a C programmer on linux.

  I write a program that saves an image in /srv/ftp/preview.png which is updating frequently and i want to create a movie from this updates.

  It’s timestamp is important for me, e.g if image updates after 3.654 seconds i want movie show this update(frame) after 3.654 seconds too.

  I searched in Internet for several hours but i can’t find any solution.

  I know about ffmpeg but it will convert images(and not one image) to movie without millisecond timestamp.

  I found this Question but it seems is not useful in this case.

  Is there any tool to do that ? if not, please introduce an API in c to write a program myself