[FFmpeg-devel] FFMpeg Developer Required

[Reuben Martin]

On Wednesday, June 11, 2014 11:42:07 AM Ray Hilton wrote:
>  I'd like to adjust the volume of one stream smoothly, and
> dynamically, based on whether there is input on the other.  For
> example, as a user talks, we level down the other audio so they are
> more easily audible.

It's called a "ducker" and I believe there exists ladspa / lv2 plugins that 
will already do that for you.