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• Does ffmpeg have a zoom detection feature so I can output the estimated speeds of the one holding the camera ?

  24 mai 2017, par P. Dee

  There is this plugin for virtualdub, Deshaker, which also detects zoom in a video in order to enlarge or make it smaller. I thought it could be used to detect speed in a video. Does ffmpeg have a similar feature so I can output the estimated speeds of the one holding the camera ?

• How to add zoom transition effects using FFmpeg to a variable number of images ?

  13 mai 2019, par Mathematics

  How can I add add zoom transition effects using FFmpeg to a variable number of images ?

  I am able to create video from a variable number of images but I am not sure how to add zoom in and out transition effects between images :

   ffmpeg -framerate 1/5 -i img%03d.jpeg -c:v libx264 -r 30 -pix_fmt yuv420p out.mp4

  I found this,

  https://superuser.com/questions/1189246/ffmpeg-image-slideshow-with-zoompan-and-fade-in-out/1190199

  But problem is that images are hard coded in that example and I am not sure how to make it work for a variable number of images ?

• Fixing issue in _processOnPosition where the item in onPositionItems[i] can be undefined mid-loop if the callback that is triggered changes the length of the onPositionItems array — onPositionItems.length becomes zero and there's an uncaught TypeError when trying to access item.fired the next time around.

  22 août 2013

  Fixing issue in _processOnPosition where the item in onPositionItems[i] can be undefined mid-loop if the callback that is triggered changes the length of the onPositionItems array — onPositionItems.length becomes zero and there's an uncaught TypeError when trying to access item.fired the next time around.