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• Cut Video clip using Media ffmpeg c#

  28 juillet 2016, par Praveen sharma

  Requirement is that I want to cut the live stream from end position to 4 minute back and then save in video file. We have to cut the video from live stream not for video saved already. My web cam will be recording the video and i have to save the stream of 4 minutes from the last position towards start.How could we achieve this

  Here with live stream doesn’t mean that not to store stream anywhere I am storing the stream in memory representation and while going for saving the video to a file cut the frame of 4 minutes from end and save in file.

• FFmpeg zoompan animation results in zig-zag pattern [closed]

  2 février 2024, par kregus

  please assist, as I am pulling my hair out !

  


  The goal is for a user to specify a zoomPoint in a video as follows :

  


  {
   "scale":4,        # Scale factor, here x4
   "offset":0,       # Start zooming in after 0ms
   "duration":5000,  # Stay zoomed in for 5000ms
   "marginX":80,     # Zoom x to 80% of video width 
   "marginY":10      # Zoom y to 10% of video height
}


  


  I am running the following, simplified FFmpeg command :

  


  ffmpeg -i "/tmp/input.mp4" -c:v libx264 -r 30 -vf "scale=iw*2:ih*2,zoompan=fps=30:z='if(gte(it,0.0)*lt(it,5.0), min(pzoom+0.2, 4),if(gte(it,5.0)*lt(it,5.5), max(pzoom-0.2, 1), 1))':d=1:s=1512x982:x='(iw - iw/4)*(80/100)':y='(ih - ih/4)*(10/100)'" /tmp/output.mp4


  


  The animation duration is 0.5s, the video framerate is 30fps, and so there are 0.5 / (1/30) = 15 animation frames.

  


  Zoom distance is scale - 1 = 3 in this case, which makes the zoom increment 3 / 15 = 0.2.

  


  This results in the following example video : click here

  


  While the zoom animation ends in the correct position, you will notice it arrives at that position in a zig-zag pattern, where it starts by zooming into the top-right corner, before changing direction towards the correct position.

  


  I cannot seem to figure out how to get it to animate the zoom in a straight line to the specified x/y position.

  


  Any tips are welcome, thanks !

  


• How do you combine videos at specific X and Y positions with FFMPEG ?

  21 mai 2020, par Adrian Elder

  If I have multiple video files, and I want to combine videos at specific x/y coordinates, how would I go about doing that ?

  



  I know that the xstack filter allows you to position videos using a column/row notation.

  



  Say I have multiple different size rectangle frames, and I knew the x/y coordinate of the top left corner, how could I position these using that value ?

  



  See the image :