Audio Libraries for MP3 editing [closed]

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

Answer 2

You could try NAudio - There would be a bit of programming required to do this but basically it would be along the lines of using NAudio to decode the MP3 first. Then passing the wave file to fade in (turn up the volume) at the time required and fade out (turn down the volume) when required. If your going to pass this to a client in a format other than wave you would then need to re-encode this file.