Here's the error message I get each time I try to import MTS files bigger than 4Go.
Exception: DISK_DIR_NOT_FOUND, filename: ****** (name of the next file to import, which is correctly present in the same directory).
When files are smaller than 4Go, everything goes all right.
(Sorry if I missed anything, I haven't taken time yet to go through the community... will do it ASAP)