Multiplex video and audio to one file

Why choose iSkysoft Mac Video Converter
Convert all kinds of videos to various mobile devices such as iPod, iPhone, iPhone 3G, Apple TV, PSP, PS3, Xbox, Xbox 360, Wii, Smart Phone, like BlackBerry, MP3/MP4 players like Archos, Creative, iRiver Zen Pocket PC, PDA, etc.
Extract audio from videos and convert which to all kinds of audios (MP3, AC3, OGG, WAV, AAC) and extraction audio and audio conversion, MP3, MP2, MKA, M4A, AAC, AC3, APE, OGG, etc.
Trim movie length to get rid of unwanted clips.
size crop videos to remove black border around your movie video for playback on portable players in full screen.
Apply special effects and adjust the video brightness, contrast, saturation, Emboss, Gray, old movie, etc etc for optimized output file.
Create your own text or image watermark. You can adjust the brand water (transparency, style and position of watermark).
Support batch conversion. You can set the maximum simultaneous processes and maximum simultaneous running processes.

All you need to convert mkv to mp4 is:
1. Macs Conputer Intel or Power PC processor (1 GHz or faster)
2. Mac OS X 10.4 – 10.5
3. 512 MB of RAM or higher
Step 1 Free Download Mac iSkysoft Video Converter: target = "_blank"> Intel version, target = "_blank"> PowerPC version
Step 2: Run iSksoft Video Converter Click "Add Files" mkv to add your input video file:
Step 2 Select MP4 as output format
a. Click the down arrow to Select MP4 as output format.
b. Click Settings to adjust the video and audio parameters according to their needs.
c. Set the output file destination in the Destination text box.
Step 3 Advanced Settings before you convert MKV to MP4 for Mac
iSkysosft Mac Video Converter provides powerful editing functions.
Click "Crop" button on the toolbar, which lets you adjust start time and end to get rid of unwanted video clips.
Click the "Effect" button, you enter in the effects panel. In this panel, you can adjust the brightness, contrast, saturation, or add special effects.
Click the "Crop" button, the video size of the crop to remove black edge of videos.
From - http://www.demo-it.net/wii-cake-designs/

Preview videos in the preview pane and take pictures as you want.
Super fast conversion speed and output file quality.
Easy to use and graphic design interfece.
that is designed specifically for users of Mac OS, including Mac OS X 10.4 Tiger, Mac OS X 10.5 Leopard and Snow Leopard on the iMac, Mac Pro, MacBook, MacBook Pro, MacBook Air, etc.
From - http://www.demo-it.net/wii-cake-designs/