All you need to convert MP4 to QuickTime on Mac OS X is a Mac Video Converter ( Comparison )

Step 1: Add Video files

Click the "Add Files" button to add MP4 files you want to convert to the program.

This Mac video converter supports batch conversion, it allows you to import several multimedia files at a time so that you can convert several videos or audios at one time.

Step 2: Output Settings

This Mac video converter can convert video to all popular formats on Mac for iPod, iPhone, PSP, PS3, Cell Phone, Apple TV, Zune, Creative Zen, MP4 players and MP3 players and so on. So you should choose the format you need before the conversion. Of course, If you don't know what formats your device supports, you can just select the format according to your device's name.

Choose the audio format (mp3, wav, ac3, ogg, ape) if you just want to extract audio from videos on Mac. Then elect an output format for each video file and specify a directory to save the output files. If you don't want to do these settings, the default settings will just work perfectly. If you don't want to use the default video and audio encoding settings, just click the Settings button to set these settings.

Set Video and audio solutions: If you want to customize the output video's quality, you can click the 'Settings' button to open the Settings window and set video resolution, frame rate, bit rate, encoder, etc. iSkysoft Video Converter for mac lets you extract audio from DVD movie to MP3 or AAC, etc.for web using or other portable players. You can set audio resolution, frame rate, bit rate and encoder on the 'Settings' panel.

Video: Set video encoding settings by selecting a resolution, a frame rate, a bit rate and a video encoder.
Audio: Set audio encoding settings by selecting a sample rate, an audio channel, a bit rate and an audio encoder.

If you want to join several avi video files into one on Mac, on the main interface, tick the check box 'Merge into one file', and you will only get one output file instead of multiple files. You can join videos on Mac using this powerful Mac video conversion tool.

Step 3: Start Conversion

When you get ready to convert the added videos on Mac, Click the Convert button to start conversion and then you can just go out for a walk or take a nap, and the conversion may have been finished when you come back.

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