How to increase volume in ffmpeg?

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Vitaly Mironov2018-10-31 08:35:03

fmpeg

Vitaly Mironov, 2018-10-31 08:35:03

I have this code:

shell_exec("ffmpeg -i $first_media_path -i $second_media_path -filter_complex \"[0:a][1:a]amerge = inputs = 2\"" .
           " -c:v copy -acodec aac -ac 2 -strict experimental -ab 160k $dir$name");

How can I turn up the volume?
Tried -af but it's not compatible with -filter_complex

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