NAudio - 1.7 - Converting WAV to MP4

I am trying to convert a PCM Wav file recorded with the WasapiLoopbackCapture class to an AAC file. The Wav file is 44100, 32bit, 4 channels.

using (var reader = new MediaFoundationReader("recordedfile.wav"))
{
     MediaFoundationEncoder.EncodeToAac(reader, "encodedfile.mp4");
}

However, i get a COMException from the MediaFoundationReader: Exception from HRESULT: 0xC00D5212

What am i doing wrong here and what would be the proper way to convert from PCM WAV to AAC?

Thanks

This probably means you haven't got an AAC encoder (or something is up with the WaveFormat of your recorded WAV file). What version of Windows are you using?