Demo

This is a video of processing a .wav file and displaying it's Fourier Transform.

As you can see, if you're plotting at a very fast rate the files don't have time to finish writing and thus there are some skipped frames in the interactive plotting video:

https://drive.google.com/file/d/0BwgvmnNgtWoMVnN4alVqTUFnaWc/edit?usp=sharing