Video rendering speed

Hi, when I am rendering an animation with audio and video, how do I get Blender to output the video as fast as the CPU can render instead of rendering only at the video playback speed?

Thanks

Set the correct frame range and press the Render / Animation button. It will render as quickly as your cpu can calculate any effects you have applied.

This doesn’t appear to be the case. I am only rendering 2d video. I have disabled all unnecessary effects like shadowing and raytracing. The software is using only about 30% of my CPU.

You won’t get 100%.
For more info see http://blender.stackexchange.com/questions/7738/how-to-make-vse-render-faster