Audio Libraries for MP3 editing

Question

In one o f my projects using ASP.NET + C# I want to be able to dynamically create 30 seconds clip of MP3 files and add a fade in/out.

What library would you recommend?

I saw there are a lot, including:

http://www.alvas.net/alvas.audio.aspx

http://www.audiosoundeditor.com/

http://www.mitov.com/html/audiolab.html

Have you ever had to deal this? What library worked the best for you?

Anything will help including free/priced software that I could call from my C# application or any kind of C# compatible library.

Answer 1

I ended up using ffmpeg