derp.py

#!/usr/bin/env python3

import sys
import vapoursynth as vs

core = vs.get_core(add_cache=False)

# assume ffms2 and scxvid got autoloaded

vid = core.ffms2.Source(sys.argv[1])
vid = core.resize.Bicubic(vid, format=vs.YUV420P8)
vid = core.scxvid.Scxvid(vid, log=sys.argv[2])

for i in range(vid.num_frames):
    vid.get_frame(i)