WAHEY! success, sorta..
anyway, I demuxed it in TMPGEnc, then I was gonna remux in TMPGEnc, but my PC was freakin out, so I tried bbmpeg. Now, I didn't have a clue about what to do, so... I used the GUI that someone on this forum created (sorry to whoever it is) and that was simple to use.
The file came to 699mb and now it fits
However it doesn't play on one of my dvd players - green filter flickering over the top and the frames jerk. I'm hoping it works on my other, newer, dvd player though.
At least it's burned, thanks all