Hackvent_2019/Day 07/decode.py

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2019-12-07 00:37:41 +01:00
#!/usr/bin/python
#$ ffmpeg -i 3DULK2N7DcpXFg8qGo9Z9qEQqvaEDpUCBB1v.mp4 -vf fps=10 frames/frame%04d.jpg -hide_banner
from PIL import Image
import os.path
def brightness(pix):
return ((pix[0] + pix[1] + pix[2]) / 3) / 255
bytes = []
i = 1
while True:
path = "frames/frame%04d.jpg" % i
if not os.path.isfile(path):
break
img = Image.open(path);
pix = img.load()
pos = [(343,177), (418,180), (551,166), (626,185),
(717,169), (788,164), (878,162), (959,165)]
byte = ""
for p in pos:
if brightness(pix[p]) > 0.6:
byte += "1"
else:
byte += "0"
bytes.append(byte)
i = i + 1
print("".join(chr(int(x, 2)) for x in bytes))