Free download AVCHD Editing Software Mac, install and launch this tool.
Click "Add File" button to input the AVCHD MTS or M2TS videos you want to edit.

Select a video, and you can preview it in the right window. Snapshot function is provided here. You can save any screen frame of the video into image file.
Choose a file, click "Effect, Trim, Crop" buttons to open Edit window.
1. Trim Video Length
Select "Trim" label at the bottom, use the sliders on the progress bar, "[ ]" buttons or type in time values to set the Start Time and End Time, thus you can easily specify your favorite segment to cut.

2. Crop Screen Area
Select "Crop" tag, then drag the frame around video in the left preview window to set the playing region you want to retain. You can also type in values in the "Top, Bottom, Left, Right" box. Select zoom mode on the left.

3. Adjust Effect
Choose "Effect" label, drag the sliders at the bottom to adjust video brightness, contrast, saturation, and you can also check "Deinterlace" to change interlaced video to progress one.

4. Join Videos
If you want to merge several of your own videos into an entire one, check "Merge into one file" in the main window, then all the videos in file list will be merged into one file.
5. Output Videos
After editing, you can choose to output videos in any popular video format as you want, just choose the format from "Profile" drop-down list, and click "Settings" to customize the quality. Click "Start" to start the editing and exporting.

All camcorder users may frequently need to edit the AVCHD videos they have captured, by trimming, cropping, merging, adjusting effect, etc. Surely there are lots of famous and powerful editing tools, but this AVCHD Editing Software Mac is the most handy one, which is specially designed for AVCHD MTS and M2TS videos, provides common editing functions, and allows you to output videos in all popular formats.