MP4 Editor for Mac is a handy MP4 Movie editing tool with an user-friendly interface, allows quick editing/splitting/trimming/cutting/joining/adjust mp4 files on Mac OS X leopard without lose any quality.

1. MP4 Editor Mac: How to edit mp4 files freely
Q: I am looking for a simple, easy-to-use video editing software to edit
mp4 files on mac. I have download some mp4 files on movies, I want to
put them together.
A: well, I'd like to introduce useful MP4 editor Mac , you can split large
MP4 file into smaller MP4 video clips, extract manually selected segment
of an MP4 video file to new MP4 video file, cut a part from the movie
and save it with all the settings the original file has, snip off a few
seconds from MP4 files (the accurate time cue point will do a good job
marking the segments to remove), or to join/merge some small MP4 files
to one in various format on Mac OS.
See the useful features below:
Enhance your MP4 videos in clicks with various adjustment options.
Include all common editing tools like Trim, Split, Crop, Merge, etc.
Add animated titles with built-in text effects.
Change the voice of MP4 video for fun.
Make fast motion/slow motion videos.
Make a Picture-in-Picture video quickly and easily.

2. Share your video on TV, YouTube, Facebook, iPhone,etc.
How to edit MP4 files Mac with those easy steps
Step 1: Download MP4 Editor for mac
Step 2: Add your MP4 files which you want to edit
Step 3. Go to Crop...function area to cut out unwanted part in the frame.
you are able to cut out black sides and subtitles if you like.

3. Step 4. Click 'Trim' button to start split your MP4 file.
select the segment of video that need to be edited or converted. Just drag
the slider bar to set start time and end time.
Step 5. Use Merge into one...to join two or more MP4 video clips into
one file(Optional)

4. Step 6. Set video Effect and special effect
this gives a huge imagination room to express your character and
preference.
Step 7. Check the Properties...to make sure all the parameters is you have
assigned before. Now you can press start button to make a new film clip.

5. If you are win user, you can use MP4 Editor , wish you can enjoy your
life.