have you tried https://www.ffmpeg.org/ffmpeg-filters.html#Examples-8 Halve the input audio volume: volume=volume=0.5 volume=volume=1/2 volume=volume=-6.0206dB In all the above example the named key for ‘volume’ can be omitted, for example like in: volume=0.5 Increase input audio power by 6 decibels using fixed-point precision: volume=volume=6dB:precision=fixed Fade volume after time 10 with an annihilation period of 5 seconds: volume='if(lt(t,10),1,max(1-(t-10)/5,0))':eval=frame and heres this git clone git://source.ffmpeg.org/ffmpeg.git ffmpeg