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Add music to video but music volume needs to increase/decrease based on the volume in video

Mark asked
Last Modified: 2016-02-20
Let's say I have a presentation I want to add music to. There are multiple durations of silence in the presentation. I would want to increase the music' volume during these points, otherwise the music volume should remain at a point where the presentation can be heard but the music is still in the background..

Does anyone know how to do this with Linux, FFMPEG, MLT, etc..

Please advise, thanks
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