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This is a step-by-step guide showing you how to convert WMV to MP4 on Mac and convert MP4 to WMV on Mac (Snow Leopard, Lion,Mountain Lion included).

Step 1: Free Download WMV to MP4 Converter for Mac (Mountain Lion, Lion supported)

To install it, double-click the .dmg archive and copy the application to your applications folder (or wherever you want). This Mac WMV to MP4 Converter well supports Mac OS X 10.6 Snow Leopard, 10.7 Lion, and 10.8 Mountain Lion; Unibody Macbook, Mac Pro, Mac Mini, MacBook, MacBook Pro, MacBook Air, iMac and PC with Mac OS X.

Step 2. Add WMV/MP4 video files to Mac WMV video to MP4 video Converter

Click + to add .wmv or .mp4 video files to the Mac WMV to MP4  Converter. You can import and convert several multimedia files at a time. Take snapshots of the videos when previewing them on the right as you like.

Step 3. Select output format as MP4 or WMV

Click the bottom format icon to reveal the output panel. You have a variety of options to choose your desired format or configured presets for various devices and applications. Here, we just select MP4 AVC(*.mp4), WMV - Windows Media Video(*.wmv) as the output format.

Step 4. Begin to convert WMV and MP4 on Mac (Mountain Lion included)

Before the conversion, you can select an output folder to save the converted video files. You can also change the video frames, bitrates, etc. freely. After all the settings, simply hit Convert to start converting .wmv to .mp4 file or .mp4 to .wmv on Mac OS X.

Knowledge sharing: About MP4

MP4 refers to MPEG-4 Part 14 or *.mp4, is a file format (also called container) specified as a part of the ISO/IEC MPEG-4 international standard. It is used to store media types defined by the ISO/IEC Moving Picture Experts Group, and can be used to store other media types as well. Generally speaking, MP4 is most commonly used to store digital audio and digital video streams, especially those defined by MPEG, but can also be used to store other data such as subtitles and still images.