avi with sound

A video analysis software i developed should be writing the frames in
an avi for further purposes.  I have no problem using the writer
structure. But my clients are demanding for sound support.
I guess there is no sound support in opencv. So i looked out a bit on
web. But the only solution for me now is to simultaneously record the
sound and then mix up with virtualdub after the video and sound
writing process.

As you may guess this approach is so primitive that i really have to
find an elegant solution for recording the avi with sound
simultaneously.

http://www.wischik.com/lu/programmer/avi_utils.html

this link gives access to an avi processing library that mixes the
avis with sounds recorded before the process. But it uses wavs for
sound source that makes the final avis result so lamely huge.

My question is is there a way for writing frames and sound, both
compressed ,to avis ,directly?


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