knekke

import subprocess
frames = 50
for frame in range(frames):
	print(frame)
	if frame == 0:
		cmd = ['ffmpeg', '-y', '-i', 'test_source.mp4',
				'-filter_complex', 
				'''[0]select='eq(n,0)'[A],[0]select='eq(n,1)'[B],[A][B]blend=all_mode=difference[out]''',
				'-map', '[out]', '-vsync',  '0', 'out.jpg']
		subprocess.run(cmd)