NAudio WASAPI Loopback + FFT plotting

Описание

I wrote a quick application to test the NAudio library with the following components...

C# .Net Framework 2.0 (Visual Studio Express 2012)
NAudio DLL with WASAPI Loopback capturing
ZedGraph DLL Plotting
FFT

The software is recording the Windows Audio output and calculating an FFT to see if the played frequencies by both Youtube videos are real.

They are, but the 20kHz frequencies are somehow not played by the videos. It seems that the video compression of Youtube rejected those frequencies... or... that the source videos actually did not include those frequencies (low sample rate or when the original videos were compressed, they lost their quality).

Here's a simple test code for NAudio and the WASAPI loopback...

http://naudio.codeplex.com/workitem/16401