If you want to convert M4V files to other format on mac os x, M4V Converter for Mac is your best choice. The powerful converter can help you convert M4V to almost all popular formats such as AVI, XviD, MPEG, MPG, DAT, MOV, ASF, FLV, MP3, AC3, AAC, M4A, etc. It also provides powerful movie edit function like movie cropping, trimming, effect adjustment, etc. to let you customize your movies.

Firstly you need to free download the Aimersoft Video Converter for Mac and install it in your Mac.

Secondly open the Mac M4V Converter and click button to add M4V video files which will be shown in the playlist. See the picture below:

You can see a preview screen on the right pane. Watch these loaded videos with the screen.

Thirdly you should choose output format and destination folder. Under Format tag select one format that the converted videos will be by clicking down-arrow button. "Settings" button is to edit the detailed settings about the format. You  can choose the destination folder by clicking "Browse" button and directly go to the defaulted folder by "Open" button.

Forthly click button to start converting M4V video files on mac after output settings. Then you just need to wait until the conversion is finished.

OK, we have successfully finished converting mkv videos on mac os x. You can convert mkv to any format you want. Moreover, the converter supports converting mkv to iPod, Zune, iPhone, Apple TV, PSP,  Xbox 360, Creative Zen, Pocket PC, PDA, Mobile Phone, etc.