MPEG-4 AVC録画の実力テスト：使いやすさはもとより、画質・音質の実力も高い。

-：、・。

MPEG-4 AVC recording performance test: Not only is it easy to use, but picture and sound quality performance is also high.

Literal

MPEG-4 AVC recording performance test: ease-of-use [topic-は] of-course, picture-quality/sound-quality [possessive-の] performance [also-も] high.

A tech review headline and verdict. はもとより (not only / let alone) is a formal expression meaning 'X goes without saying, and Y too.' The mid-dot ・ between 画質 and 音質 pairs related qualities. A compact evaluative statement typical of product reviews.