Conversion Between WMV and M4V on MAC OS (Lion included)
This is a step-by-step guide that will guide you through how to convert .wmv to .m4v on Mac OS X, and vice versa.
Here is the example on how to convert WMV to M4V. As regarding to M4V to WMV conversion, the steps are almost the same, except selecting target format. What you need is only a WMV to M4V Converter for Mac. Choose either Intel version or PowerPC version depending on your Mac computer processor type.
Download Video Converter for Mac (Intel version) Download Video Converter for Mac (PowerPC version)
To install it, simply mount the .dmg archive by double-clicking it, and copy the application to your applications folder (or wherever you want).
Step 1: Add WMV video files to Mac WMV to M4V Converter
Click File -> Add Video Files to add WMV video files to the wmv to M4V mac converter. This WMV video converter for Mac supports drag-drop and batch conversion, so you can import and convert several multimedia files at a time.

Step 2: Select output format as M4V
Click image button at right of each video item, set output file name and choose output format from following list. Select "M4V" as the output format.

Step 3: Change M4V Video and audio Settings
You can change the Resolution, Codec, Bit rate and Frame rate of the M4V video and Sample Rate and Bit Rate of the M4V Audio. The size of the M4V file depends a lot on these settings.

Step 4: Select output directory
Click Video Converter -> Preference -> Output from main menu to select an output directory.

Step 5: Click 'Start' to convert WMV to M4V on Mac
After all the settings, just click 'Start' to convert .wmv to .m4v file on Mac OS X (Mac OS X Lion, Snow Leopard included). If you want to trim, crop and more editing, please go to how to trim, crop and merge M4V videos on Mac.
What's M4V and WMV
M4V, like MP4, is one of the file name extensions for MPEG-4 Part 14 standard. It stands for Raw MPEG-4 Visual bitstreams. M4V is known as one of the most popular video formats nowadays, due to the popularity of Apple’s iPod, iPhone, and iTunes Store. WMV was first introduced to the world by Microsoft in November 1992 as a multimedia format, part of Microsoft Video for Windows technology. M4V files can contain audio data and video data, which are interleaved for the playback.
