mediAvatar Video Converter is a multi-format video converter. It supports decoding and encoding almost all video and audio formats, including HD video, making it pretty easy to play them on iPod, iPhone, iPad, Apple TV, Android phones, PSP, PS3, Xbox360, Zune, PMPs, 3GP mobile phones, Wii, NDS, and many other portable devices.
With the ability to join/clip/split/crop videos and add watermarks/soundtracks/effects/transitions, this application can convert videos with custom quality and parameters on Mac.