video_rename.py

from datetime import datetime
import json
import os
import subprocess
from sys import argv

dir = argv[1]

files = []
for dirpath, dirname, filenames in os.walk(dir):
    for filename in filenames:
        if filename.startswith('MVI_'):
            files.append(os.path.join(dirpath, filename))

for old in files:
    cmd = ['ffprobe', '-print_format', 'json', '-show_format', old]
    p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    out, err = p.communicate()
    
    j = json.loads(out.decode())
    times = j['format']['tags']['creation_time']
    dt = datetime.strptime(times, '%Y-%m-%d %H:%M:%S')
    newname = 'mvi_' + dt.strftime('%Y%m%d_%H%M%S') + '.mov'
    new = os.path.join(os.path.dirname(old), newname)

    print("Renaming {} to {}".format(old, newname))
    os.rename(old, new)