Increase volume with ffmpeg

Question

I have the code below I want it to automatically increment up like this:
(t, 30,33) and (t, 60,63), (t, 90,93) and so on it adds 30 units.

     ffmpeg -i in.mov -vcodec copy -af "volume=enable='between(t,30,33)':volume=0"out2.mov

Gyan · Accepted Answer · 2018-06-02 12:52:22Z

2

Use

-af "volume=enable='gte(t,30)*lt(mod(t,30),3)':volume=0"

answered Jun 2, 2018 at 12:32

Gyan

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1

Can you explain the parameters for me? Thank you so much
– Monso
Jun 2, 2018 at 15:43
lt(mod(t,30),3) selects first 3 seconds of every 30 seconds, gte(t,30) starts selection from t=30s, so that the first 3 seconds (0-3) aren't selected.
– Gyan
Jun 2, 2018 at 16:12

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