Summary: This guide will show you how to ingest mp4 movies and edit them in iMovie quickly and easily on Mac OS X 10.9 Mavericks. I don't know if you have ever met such similar questions, if you did, why not take the following article as a reference for enjoying editing MP4 files in iMovie? 
iMovie is the fastest and easiest way to turn home movies into dazzling Hollywood-style hits. It is a video editing software sold by Apple Inc., and a part of iLife suite of Macintosh applications. It allows users to edit their own family movie. When iMovie firstly appear it is popular with simplification, and most of the work is finished by simple clicking and dragging. Due to this cause, sometimes iMovie is not so simple to let us to edit
4K videos,
MXF files, etc. So here do you wanna get a further
learning of iMovie AVI?
Technically, iMovie does import MP4 video. However, iMovie only import MP4 files that are encoded with MPEG4/AAC or H.264/AAC data. And yet, MP4 is a video container format that may contain various audio and video codec (and sometimes even subtitle streams included).
If the MP4 file is not encoded with iMovie support codec, iMovie will refuse to import this kind of MP4 video.
Therefore, you can firstly
convert MP4 to iMovie supported video formats to make it easy for you to import MP4 files into iMovie. iMovie is not so that picky on formats but it prefers AIC(Advanced Intermediate codec) in editing. Is there any quick and easy way to do this?
Pavtube MP4 to imovie Converter (Pavtube HD Video Converter for Mac) can give you easy but effective solution for importing
MP4 footages into iMovie for editing on Mac (including Mac OS X 10.9 Mavericks). With the assistance of the Mavericks HD Video Converter, you can effortlessly transcode MP4 file to iMovie acceptable AIC .mov. Then, what you need is just to import the converted file into iMovie for editing. Just follow the steps below to transcode MP4 to AIC for importing to imovie for editing on Mavericks.
Preparation:
1. Install and launch the Mac
Mavericks HD Video Converter. You can directly drag and drop mp4 video files to this software.
2. Click Format bar to choose the output format. Click and choose iMovie and Final Cut Express>Apple Intermediate Codec(AIC) (*.mov).
3.You can click "Settings" to customize the output parameters, adjust the resolution, bitrate as you want.
4.Start convert MP4 to AIC for iMovie editing on Mac OS X 10.9 Mavericks.
Click the "Convert" button to start transcoding MP4 to AIC .MOV videos to be compatible with iMovie.
After the MP4 to Prores conversion finished, you can easily import video files and projects into iMovie for further editing without any trouble. Congratulations! You have successfully taken the first step to make your own masterpiece.
With this MP4 to AIC Converter, you can easily change MP4 files to iMovie for editing. This software runs fast, so you can convert your MP4 video to iMovie in less time. video and audio synchronization are perfectly guaranteed.
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source:
http://videostepconvertmap.blogspot.kr/2015/01/import-mp4-to-imovie-mavericks-hd-video.html 
Fri Aug 28, 2015 2:20 am by Vanessa18
Subject: Import/Edit MP4 footages into iMovie for editing on Mac