Extract mdat atoms from QuickTime files

qt-extract.py

from hachoir_core.cmd_line import unicodeFilename
from hachoir_parser import createParser
import sys

def find_atoms(filename):
    parser = createParser(unicodeFilename(filename))
    atoms = []
    for field in parser:
        print '%s: %s %s + %s' % (field.description, field.name, field.absolute_address, field.size)
        if 'mdat' in field.description:
            atoms.append({'addr': field.absolute_address / 8,
                          'size': field.size / 8})
    return atoms

def extract(src, dst, start, size):
    f = open(src)
    f.seek(start)
    open(dst, 'w').write(f.read(size))

info = find_atoms(sys.argv[1])
print info
extract(sys.argv[1], sys.argv[2], info[0]['addr'], info[0]['size'])

I am testing this on a FalconZero F170HD Dashcam. Ultimately, my goal is to extract out the realtime GPS data. I installed "hachoir_core" and "hachoir_parse" (note, a comment that those were required might be nice). I first tried the script as written, but ulitmately, was going to change this to look at the "ftyp" and "frea" atoms, as I think that might have the data I want.

python qt-extract.py 2016_0829_160810_056.MOV

Atom: ftyp: atom[0] 0 + 192
Atom: frea: atom[1] 192 + 1102368
Atom: mdat: atom[2] 1102560 + 3929484640
Atom: moov: atom[3] 3930587200 + 644808
[{'addr': 137820L, 'size': 491185580L}]
Traceback (most recent call last):
  File "qt-extract.py", line 22, in <module>
    extract(sys.argv[1], sys.argv[2], info[0]['addr'], info[0]['size'])
IndexError: list index out of range

Any suggestions? I tried AtomicParsley but that's only mp4, not quicktime containers.

Eric - did you ever get anywhere with your pursuit to extract the GPS data from the FalconZero F170 mov files?