Audio track in video file - C++

My application is transforming an AVI video file into another AVI file. I use the OpenCV library. Unfortunately videos created with OpenCV have no sound as the library does not support audio.

Is there any easy way开发者_StackOverflow中文版 to copy the audio track from one video file to another? Maybe FFmpeg?

My application is written in Visual C++.

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You can use FFmpeg. The easiest way would be to just use the command line tool to extract/reassemble. If you need your application to do it itself, looking into the sources for how they do it should help.

Alternatively, as you mention VC++, why not use DirectShow? It should not be too difficult to sink the audio into a file for extraction and later sink the video/audio mix into a file for composition.