I actually just found out how to add chapters to MP4, so I'll do that tonight (baby's mood permitting), and reupload it to Ryan, so he can post it to RITC.
Actually, I think ninjaw was suggesting putting the file onto a DVD-ROM disc, and seeing if your player can read the file that way.
[pedantic_nazi]Actually, shouldn't that be "[technological_nazi]"?[/pedantic_nazi]
Old school!
Yep, done that and it works great. Will no doubt re-do when the chapters are inserted too. Having downloaded the mkv file too, put that on my memory stick and plugged into my telly (bearing in mind there was a codec issue on the mp4 for me, and that's why I needed to burn to disc in the first place) it worked fine...sods law.
Cheers, as always, for you help ninjaw and TheBang.