import moviepy.editor as mpe


def rgb2gray(get_frame, t):
    rgb = get_frame(t)
    r, g, b = rgb[:, :, 0], rgb[:, :, 1], rgb[:, :, 2]
    gray = 0.2989 * r + 0.5870 * g + 0.1140 * b
    return gray


def invert(get_frame, t):
    frame = get_frame(t)
    return 255 - frame


def threshold(get_frame, t):
    frame = get_frame(t)
    thresh = 128
    return ((frame > thresh) * 255).astype("uint8")


src = mpe.VideoFileClip('nuke.m4v', audio=False).fl(invert)
nuke1 = src.subclip((0, 0.5), (0, 7.5))
nuke2 = src.subclip((0, 7.5), (0, 14.5))

face = mpe.VideoFileClip('face.m4v', audio=False).crop(y1=32, y2=512).fl(rgb2gray).fl(threshold)
face_inv = face.fl(invert)

face.ismask = True
face_inv.ismask = True

cc = nuke1.set_mask(face_inv)
cc2 = nuke2.set_mask(face)

final = mpe.CompositeVideoClip([cc, cc2])
final.write_videofile('nuke_masked.m4v', fps=30, codec='libx264', bitrate='5000k', audio=False)