Looking for mp3 to ac3 audio conversion software (freeware or paid)

[Gums]

Been searching all afternoon for a quick and easy to use audio converter. Specifically looking to convert mp3 to ac3 for use in DVDs. Would like to find software with a simple to navigate UI. Most of the ones I've found (and believe me, there are many) are trial versions with a paid version to follow. The catch is lots of these trial versions only allow for partial conversion or some type of vocal overdub (sort of like an audio watermark). I've got nothing against a paid version, but is there any reliable audio conversion software that someone could recommend using? Freeware or paid?

 

[Airbot]

You can covert that with Audacity. Open source/Free..


UI isn't all that simple, but all you'd have to basically do is:

Open mp3/import, export as ac3...


Use beta for Win 7 - Audacity 1.3.14
Program is in continual Beta status..