ffdshow is an advanced DirectShow filter and VFW codec that supports many audio and video formats. For example: H.264, MPEG-4, MPEG-2, H.263, VP3, VP6, Theora, MJPEG, SVQ3, MP3, AC3, DTS, E-AC3, AAC, and Vorbis.
This app is awesome. It boosts the quality of the audio. Wonder if there is a version using MSVC 2013. It is time to use the new compiler.