I know this question has been asked a number of times, and I\'ve looked through every single one of them here on StackOverflow.
I\'m simply trying to loop a 5 second MP4
You don't need any extra scripts for that kind of stuff.
The "video" tag has built in loop attribute, use this and your video will loop.
You can also add preload attribute if you wanted to. If you want, you can find more information about the video tag here: HTML video Tag
Edit: Oops. Didn't notice Offbeatmammals comment under your question. :)