So, I updated MMM’s code to Python3 and improved a few things.
def get_mov_timestamps(filename):
''' Get the creation and modification date-time from .mov metadata.
Returns None if a value is not available.
'''
from datetime import datetime as DateTime
import struct
ATOM_HEADER_SIZE = 8
# difference between Unix epoch and QuickTime epoch, in seconds
EPOCH_ADJUSTER = 2082844800
creation_time = modification_time = None
# search for moov item
with open(filename, "rb") as f:
while True:
atom_header = f.read(ATOM_HEADER_SIZE)
#~ print('atom header:', atom_header) # debug purposes
if atom_header[4:8] == b'moov':
break # found
else:
atom_size = struct.unpack('>I', atom_header[0:4])[0]
f.seek(atom_size - 8, 1)
# found 'moov', look for 'mvhd' and timestamps
atom_header = f.read(ATOM_HEADER_SIZE)
if atom_header[4:8] == b'cmov':
raise RuntimeError('moov atom is compressed')
elif atom_header[4:8] != b'mvhd':
raise RuntimeError('expected to find "mvhd" header.')
else:
f.seek(4, 1)
creation_time = struct.unpack('>I', f.read(4))[0] - EPOCH_ADJUSTER
creation_time = DateTime.fromtimestamp(creation_time)
if creation_time.year < 1990: # invalid or censored data
creation_time = None
modification_time = struct.unpack('>I', f.read(4))[0] - EPOCH_ADJUSTER
modification_time = DateTime.fromtimestamp(modification_time)
if modification_time.year < 1990: # invalid or censored data
modification_time = None
return creation_time, modification_time
and…
Wouldn’t you know it, just as I finished I found how to do it with exiftool, which I use for similar tasks with .jpg files. :-/
⏵ exiftool -time:all img_3904.mov