Convert MOD video to mp4 and read some metadata from MOI file.

batch_run.sh

#!/bin/sh

for vid in *.MOD; do python3 convert_mod.py $vid; done

convert_mod.py

#!/usr/bin/env python3

import read_moi
import sys, os, shlex
from subprocess import call

# ffmpeg -i "" -codec copy -metadata title=2016-09-20T21:30:00 -metadata year=2016 -aspect 16:9 out.mp4

AUTHOR = 'Aldo Ridhoni'
QUIET = True


def mod2moi(filename):
    return os.path.splitext(filename)[0] + '.MOI'


def get_metadata(filename):
    metadata = dict()
    with open(filename, 'rb') as binary_file:
        metadata['date'] = read_moi.read_date(binary_file)
        _, metadata['ratio'] = read_moi.read_aspectratio(binary_file)
        return metadata


def main():
    program = "ffmpeg -hide_banner"
    input_file = "-i '%s'" % sys.argv[1]
    codec = "-codec copy"
    author = "-metadata 'author=%s'" % AUTHOR
    metadata = get_metadata(mod2moi(sys.argv[1]))
    title = metadata['date'].strftime('-metadata \'title=%Y-%m-%dT%H:%M:%S\'')
    year = metadata['date'].strftime('-metadata \'year=%Y\'')
    aspect = "-aspect %s" % metadata['ratio']
    output = metadata['date'].strftime('%Y%m%d_%H%M%S.mp4')
    args = " ".join((program, input_file, codec, author, title, year, aspect, output))
    args = shlex.split(args)
    print(args)
    call(args)


if __name__ == "__main__":
    main()

read_moi.py

#!/usr/bin/env python3

import sys
from datetime import datetime


def seek_int(binary, seek, length):
    binary.seek(seek, 0)
    return int.from_bytes(binary.read(length), 'big')


def read_date(binary_file):
    binary_file.seek(0, 0)
    version = binary_file.read(2)
    if version == b'V6':
        year = seek_int(binary_file, 6, 2)
        month = seek_int(binary_file, 8, 1)
        day = seek_int(binary_file, 9, 1)
        hour = seek_int(binary_file, 10, 1)
        minutes = seek_int(binary_file, 11, 1)
        miliseconds = seek_int(binary_file, 12, 2)
        seconds = miliseconds // 1000
        return datetime(year, month, day, hour, minutes, seconds)
    return False


def read_duration(binary_file):
    duration_ms = seek_int(binary_file, 14, 4)
    return duration_ms // 1000


def read_aspectratio(binary_file):
    binary_file.seek(128, 0)
    data = binary_file.read(1).hex()
    if data[:1] is "5":
        system = "PAL"
    elif data[:1] is "4":
        system = "NTSC"
    if data[1:2] in ("0", "1"):
        ratio = "4:3"
    elif data[1:2] in ("4", "5"):
        ratio = "16:9"
    return system, ratio


if __name__ == '__main__':
    with open(sys.argv[1], 'rb') as binary_file:
        date = read_date(binary_file)
        duration = read_duration(binary_file)
        system, ratio = read_aspectratio(binary_file)
        if date:
            print(date.strftime('File created at %d %b %Y %H:%M:%S'))
            print("Duration: %s seconds" % duration)
            print("System: %s, Ratio: %s" % (system, ratio))