First of all, thank you all for the tips and information on this topic.
I’ve been trying to import m2ts files to an iMac. My final goal was to make a DVD with those files, with minimum editing.
I’m not reading the m2ts files from the camera anymore. I copied the files in a portable hard disk. By the way, they were taken with Panasonic’s Lumix GF1.
MPEG Streamclip didn’t work (apparently it reads m2t, but not m2ts files). ClipWrap worked only for relatively small files (anything over 800MB would cause the program to crash).
Finally, iSky DVD Creator did the trick!
https://www.iskysoft.com/user-guide/dvd-creator-mac.html
It’s a quite powerful DVD burner, with very basic editing options included. If anyone only needs to make a DVD with those nasty m2ts files, this could be an option. This doesn’t apply to professional editing with FCP, but I hope it can be useful anyway.