Looks like you got it sorted. I’m on linux so when I done it I used a basic for loop using the following format:
for f in *.mp4; do echo "${f%.mp4}"; mkdir "${f%.mp4}"; mv "${f%.mp4}".* "${f%.mp4}"; done
This would take the name of each mp4 file in a folder, strip the .mp4 part of the name, create a folder with the name and then move it and any other files like srt with the same name into that folder. Took approx 5-10 minutes on my NAS when I done at the time.
