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High-definition video or HD video refers to any video system of higher
resolution than standard-definition (SD) video. This article discusses
the general concepts of high-definition video, as opposed to its
specific applications in television broadcast (HDTV), video recording
formats (HDCAM, HDCAM-SR, DVCPRO HD, D5 HD, XDCAM HD, HDV and AVCHD),
the optical disc delivery system Blu-ray Disc and the video tape
format D-VHS.

iMovie supported MPEG-2/MPEG-4/Quick Time Movie/AVCHD/DV and HDV(High
Definition Video), so if you want to import hd video files into
imovie, you need import hd video into imovie. HD Video to iMovie
Converter can importing ts, tp, trp, m2ts, mts into imovie on Mac OS X
as simple as quickly. HD Video to iMovie Converter also can importing
WMV (WMV Video Converter ), MP4, MOV, M4V, AVI, FLV, 3GP, 3GPP, 3G2,
MPG, VOB, MPEG, MPG, ASF, MOD, MKV (Mac MKV Video Converter ), etc.
into imovie on Mac OS X.

How to import ts, tp, trp, m2ts, mts, etc. hd video files into imovie
on mac os x?

http://www.4yousoft.com/imovie/hd-video-to-imovie.htm

Step 1: Add HD video files
Download, install and run HD Video to iMovie Converter, then click the
"Add files" button to import your HD files. This HD into imovie
converter support batch conversion, so you can import multiple files
at a time.

Step 2: Select output format: "MPEG-4 Movie (*mp4)"

Step 3: Convert
Click "Start" button, it begins to convert your HD files to imovie mp4
format.

Step 4: Importing convertion mp4 files to imovie
Launch iMovie, go to "file import movies". Select the converted MP4
video then click "import".

http://www.4yousoft.com/imovie/hd-video-to-imovie.htm