Step1. Install Total Media Converter for Mac
Download and install Aimersoft Total Media Converter for Mac
Click the "Add video” button to import your WMV video, this Total Media Converter for Mac support batch conversion, so you can import multiple files at a time .
Step2. Convert WMV to MP4, WMV to MOV, WMV to AVI/MPEG/MP3/AAC/etc
Check the files you want to convert, and then click the “Settings” button to select output formats. There are some categories such as common video, common audio, iPod, iPhone, PSP, or you can customize the formats according to your need.
After the above steps, you can click the “Start” button to finish the conversion.

Tips:
1. Open the “Edit” section to edit your WMV file, you can trim a part of WMV file, or cut off the black edges of your video, or add watermark to your video for sharing.
2. If you want to join some WMV files to one file for playback on your iPod, iPhone, PSP, or other portable devices, you can check “Merge into one file” on the main interface of this software.
3. You can use Total Media Converter for Mac to convert DVD and video files, and output them to ome file.
4. If you have other video formats, such as MKV, TS,TP, MTS, M2TS, TRP, FLV, MP4, MOV, AVI, Mod, ASF, etc, Total Media Converter also can help you convert them to your need formats.
Resource: http://www.aimersoft-mac.com/articles/convert-wmv-mp4-mov-on-mac.html#129