Get. Your. Oil. Changed.

It’s quite embarrassing, but I don’t drive very much (have been working from home for almost 5 years now) and let time and miles get away from me. I’m currently waiting to hear back, but I’m very likely going to need to get a new engine, so this will be the most expensive mistake that I’ve ever made.

Thanks for all of the replies, they were very insightful!

The H264 to H265 appears to account for the majority of differences that I was seeing in file sizes.

Ooof - thanks, I've fixed that.