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• FFMPEG - why zoompan causes unexpected stretching ?

  14 septembre 2020, par Sarmad S.

  I have two images as input, both are 1600x1066. I am vertically stacking them. Then I am drawing a box and vertically stacking that box under both of the image. Inside of the box I write text, then I output a video that is 1080x1920. Everything works well, until I use zoompan to zoom in on the images, I get weird behavior. basically all input images including the box stretchs (shrink) vertically and no longer fit the entire height of the video which is 1920.

  


  The command (removed some drawtext commands from it) :

  


  -filter_complex 
"color=s=1600x1066:color=blue, drawtext=fontfile=font.otf: text='My Text':fontcolor=white: fontsize=30: x=50: y=50[box]; 
[0]scale=4000x4000,zoompan=z='min(zoom+0.0015,1.5)':x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':d=125:s=1600x1066[z0];
[1]scale=4000x4000,zoompan=z='min(zoom+0.0015,1.5)':x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':d=125:s=1600x1066[z1];
[z0][z1][box]vstack=inputs=3"


  


  How do I fix this ? I want to zoom in without stretching the images

  


  Before using zoompan this is how the video looks like (I want to keep it this way while zooming in the images) :


  


  After using zoompan this is how the video looks like :

  


  

  


• FFmpeg — calculate zoompan filter duration

  1er août 2017, par artuska

  I want to make 30 seconds video with smooth small zooming effect of an image. What i do :

  ffmpeg -y -loop 1 -i 1.png -vf "zoompan=z='min(max(zoom,pzoom)+0.0015,1.1)':d=1:x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':s='1000x1000'" -c:v libx264 -t 30 1.mp4

  How to modify my ffmpeg zoompan params for zoom effect during 30 seconds (all video time) ? Now it produce 3 seconds effect at all. Docs says :

  d — Set the duration expression in number of frames. This sets for how many number of frames effect will last for single input image.

  But my experiments with d falied. Thanks !

• FFmpeg Easing function doesn't behave as expected [closed]

  11 juin 2024, par Alejandro Sanchez

  What is the simplest way to add an easing function to an animation ? I'm currently trying to animate a zoom value, but for some reason, it goes completely over the final zoom value i constrained it to (my easing function should output values between 0 and 1) : This is the part of a bigger expression which i just cannot understand :

  


  if(gt(in_time\,3.7999999046325685)\,3 - ((0.3) * (((exp((5*(it-3.80)) - 1))/(exp(5*0.80)-1))))\,3)

  


  Note : (exp((5*(it-3.80)) - 1))/(exp(50.80)-1))) are values between 0 and 1 for the animation duration of 0.8 seconds, however the resulting zoom goes way beyond 3-0.31 = 2.7, it just goes crazy in the end.

  


  I tried all kinds of easing functions, all of them behave similarly