How to change the sound of one of the audio recordings when merged in FFmpeg?

Question

Audio

I'm trying to merge two audio recordings into one using FFmpeg.

exec("ffmpeg -i ".$speechDownmixAudio." -i ".$speechAudio." -filter_complex amix=inputs=2:duration=longest ".$speechAudioOutput);

There was a problem that the first audio recording is louder than the second, because of which the second is not heard at all. How to increase the volume of the second and reduce the first audio recording? I tried to play with the channels - it did not help.

Answer 1

If it is not essential for you to do this in ffmpeg, then use Audacity , where it is done in a couple of clicks (both volume equalization and merging).