It might be possible to play the audio stream. But it depends on the format. With video files you don't have just "AVI" or "MP4" formats. Each video, audio and subtitle stream has its own format.
AC3Filter can handle: AC3, DTS, most LPCM streams.
For AAC you can use
CoreAAC decoder.
Vorbis audio can be decoded either by
CoreVorbis or the decoder included in
OggDS filter pack.
These filters are free and can be found using Google. I don't give direct links because I cannot guarantee that versions other than those I'm using (older) are working.
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just to add windows media player was able to play the MP4 file but not BSPlayer.
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BSPlayer uses a different
graph building technology than Windows Media (either mplayer2.exe or the graphical player). In my experience it performs better.
I suspect BSPlayer chooses a different MP4 splitter to which the audio decoder refuses to connect.