The VideoLAN Forums

Playing mp4's with AAC audio results in just stereo sound for me too. In VLC the audio type is set to SPDIF.

My work around is to use Handbrake to convert the AAC audio track to AC3 passthru.

Solution. I upgraded to VLC 0.9.8.a and then changed Output Type = Win32 waveOut

I watched a full 45min video with A52 over SPDIF audio flawlessly. Finnally!!