Knowledge about M4V:
M4V, developed by Apple, is a file container format and close to MP4 format. The M4V file format is a video file format used by Apple’s iTunes application. That's to say, M4V can be well playback on Mac product like iPad, iTouch, iPhone, etc.

In the situation, how to edit M4V into iMovie or Final Cut Pro becomes to be a common issue. Convert M4V to iMovie or Final Cut Pro file formats can be a workable solution. So you need a program that can do the conversion. Doremisoft Mac Video Converter is such the program, which can help you to finish the conversion at most four steps: add file, select the output file format, edit video or audio settings for the imported file (optional) and start converting. More custom settings are available like set video codec, bit rarte, frame rate, resolution, audio codec, sampling rate, channels, etc.

Step by step guide on how to edit M4V in iMovie or FCP:

Step 1: Add M4V files
Locate the M4V movies that want to be edited to the program: M4V to iMovie Converter. It also support batch conversion. That's to say, you can load multiple files at one time.

Step 2: Choose the output file format for iMovie
Select the output video as iMovie DV from the Profile list, you can adjust the video quality by click "Settings" button.

Step 3: Convert M4V to iMovie
Specify an output folder for saving the converted files, then press "Convert" button to start converting M4V to video for iMovie.

Do the same job,if you would like to edit M4V in Final Cut Pro.

Tip: M4V video editor for Mac provides you with a tons of simple and easy-to-use, useful video editing features, such as video trimming, video splitting, video merging, video effecting, etc.