MPEG-4 Part 14 or MP4 file format, formally ISO/IEC 14496-14:2003, is a multimedia container format standard specified as a part of MPEG-4. It is most commonly used to store digital video and digital audio streams, especially those defined by MPEG, but can also be used to store other data such as subtitles and still images. Like most modern container formats, MPEG-4 Part 14 allows streaming over the Internet. A separate hint track is used to include streaming information in the file. The official filename extension for MPEG-4 Part 14 files is .mp4, thus the container format is often referred to simply as MP4. (From: Wikipedia.com)

However, I found many people want to know how to import AVCHD to QuickTime Mac as below.

Q1: Is There Any Movie Making Software that Edits MP4?
I'm trying to split a MP4 video on my mac but I don't have imovie are there any video editing software that edits MP4. (From Yahoo Answers: http://answers.yahoo.com/question/index;_ylt=AkMDg3kdgAnkzNlDbz21D2IjzKIX;_ylv=3?qid=20100811155737AA7vCSm)

Q2: MKV Splitter or MP4 Splitter? please read and help
Ok, so I use visualhub for all my HIDeF/Bluray MKV conversion. But i'm sick of the 4 gig limit. I'd like a littler better quality.
So my question is, does anyone know of any mkv splitter so i can split the file in to, so i can convert it so it's 2 4gig parts? so the quality doesnt suffer?

For resolving these problems, I search a tool--- MP4 Editor for Mac in the website. The MP4 Editor Mac is also MP4 splitter Mac, MP4 joiner Mac, MP4 cutter Mac supported by portable devices such as iPod, iPhone, Apple TV, Zune, Blackberry, GPhone, PSP and MP4, MP3 media players. I hope it is helpful for us.