Hi -
.MTS & .M2TS are just extensions used for AVCHD files. MTS =
MPEG
Transport
Stream
On the page Nicholas linked AVC files are listed, though the .m2ts extension isn't specifically mentioned.
PD produces .M2TS video files when AVC H.264 format is selected, so it's obviously OK importing them, as HDedit said.
Cheers - Tony
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