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Tech: ffmpeg-selective mp4 volume increase

Bonzo3legs 28 Aug 17 - 12:48 PM
DaveRo 28 Aug 17 - 01:16 PM
Bonzo3legs 28 Aug 17 - 04:21 PM
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Subject: Tech: ffmpeg-selective mp4 volume increase
From: Bonzo3legs
Date: 28 Aug 17 - 12:48 PM

A command for increasing the volume of mp4 video is:
ffmpeg -i input.mp4 -vcodec copy -af "volume=3dB" output.mp4

This would increase the volume of the whole video by 3db

What would be the command to increase the video's volume by 3db between 24 minutes and 30 seconds and 30 minutes and 10 seconds only?


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Subject: RE: Tech: ffmpeg-selective mp4 volume increase
From: DaveRo
Date: 28 Aug 17 - 01:16 PM

"Timeline editing: Some filters support a generic enable option..."

If volume is one of them, maybe something like:
volume=enable='between(t,24*60+30,30*60+10)',volume=3dB


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Subject: RE: Tech: ffmpeg-selective mp4 volume increase
From: Bonzo3legs
Date: 28 Aug 17 - 04:21 PM

Thanks for that, it seems to be working!


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