I find
Aunsoft MTS/M2TS Converter for Mac as the best
Panasonic to iMovie converter to transcode MTS videos to iMovie supported AVI.
Tips:
1. The output files also works for Non-linear editing software on MacBook Pro or iMac like
Final Cut Pro (FCP),
Final Cut Express (FCE),
Adobe Premiere Pro,
Avid Media Composer (MC), and
Kdenlive.
2. The Mac MTS to AVI converter also works with the AVCHD videos from camcorders like
Panasonic HDC-TM300, Panasonic HDC-SDT750K, Panasonic Pro AG-DVC20, Panasonic Pro AG-HMC150, Panasonic HDC-SD60, Panasonic TM700K.