Recording Video

i want to record video from unity game output. taking fixedupdate frames as png is easy. how can i get audio from unity output? some assets says they can record audio but i do not know their performance and accuracy.

You might be interested on it then:

http://www.kamcord.com/

thanks for suggestion. this works on a mobile device. i need fixed resolution like full HD. if i use a mobile device i can use mobile device resolution.