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How To Make Audio/ Video Louder or More Quiet With ffmpeg/ avlib
By Louder:
ffmpeg -i Mandolin.mp3 -filter:a “volume=+10dB” MandolinLoud.mp3
Quieter:
ffmpeg -i Mandolin.mp3 -filter:a “volume=-10dB” MandolinLight.mp3
Ex: Make Video Louder
ffmpeg -i Mandolin.mp4 -filter:a “volume=+10dB” MandolinLoud.mp4
If you get a warning error that says: The encoder ‘aac’ is experimental but experimental codecs are not enabled, add ‘-strict -2’ if you want to use it.… add the following flag:
ffmpeg -i Mandolin.mp4 -filter:a “volume=+10dB” -strict -2 MandolinLoud.mp4