# to use the mrotateOxOy macro, go to the directory where all your video images are and:
# gmic $(ls|head -100) -a z ../macro.gmic -mrotateOxOy
mrotateOxOy:
  #initialisation
  rox=0 roy=0       #rotation angle
  drox=0 droy=0     #rotation angle variation
  image_number=101  #image to load
  -v -
  -repeat 10000
    #rotate Oy et Ox
    --permute xzyc -rotate[-1] $roy,0,1,50%,50%
    -permute[-1] zyxc -rotate[-1] $rox,0,1,50%,50%
    -permute[-1] zxyc
    #extract the image et erase
    -crop[-1] 0,0,50%,100%,100%,50%
    -o[-1] ../rotatedOxOy/{100000+$image_number}.png -rm[-1]
    #rotation angle varies
    drox={$drox*0.9+(?-0.5)-($rox*abs($rox)/800)}
    droy={$droy*0.9+(?-0.5)-($roy*abs($roy)/800)}
    rox={$rox+$drox} roy={$roy+$droy}
    -v + -e $rox,$roy,$drox,$droy -v -
    #one step ahead in time
    -i {10000+$image_number}.jpg
    -a[0,-1] z
    -crop[0] 0,0,1,100%,100%,99
    image_number={$image_number+1}
  -done