Gif with a cat jumping in a box

moviepy_cat_in_a_box.py

# Result: http://i.imgur.com/Lmj21mR.gif

import moviepy.editor as mpy
from moviepy.video.tools.drawing import color_split

# LOAD THE GIF SEVERAL TIMES

clip = VideoFileClip("./source.gif")
W,H = SIZE = clip.size
duration = clip.duration

left = VideoFileClip("./source.gif").crop(x2=W/2)
right = VideoFileClip("./source.gif").crop(x1=W/2)

# WORK ON THE LEFT PART (JUMPING CAT)

T=.65 # period for the jumping cat
GW= 30 # width of the mask's gradient black/white

def mask_mf(t):
    x= max(-GW,min(W/3,(t-T)*W/duration/1.3-30))
    return color_split(SIZE,x=x, grad_width=GW)

mask = VideoClip(mask_mf, ismask=True, duration=duration)
left_mask = left.set_mask(mask)

compo_left = (CompositeVideoClip(
                [left_mask.set_start(i*T)
                 for i in [3,2,1,0]])
              .subclip(T,3*T))

# WORK ON THE RIGHT PART (MAKE IT LOOPABLE)

compo_right = (right.subclip(0.6,0.9)
               .fx(vfx.time_symmetrize)
               .speedx(final_duration=2*T))

# ASSEMBLE LEFT AND RIGHT, WRITE TO A FILE

final = clips_array([[compo_left, compo_right]])
final.write_gif("cat_in_a_box.gif", fps=15)