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When I watch a Movie on my Desktop PC - Fedora 14 - In many times the Movie is too quiet to hear, but sometimes....it's too loud - Because there's suddenly music, or an explosion, that's really loud...

Are there any solutions/script or anything to make the sound volume constant? E.g.: the volume automatically turns down, if there is a loud explosion in the Movie, or something?

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I will try out VLC's Audio normalizing with the option "10" – LanceBaynes Aug 15 '11 at 15:57
ladspa for pulseaudio here – Aquarius Power Feb 8 at 20:07

A compressor does exactly that. Some advanced media players having an option for that.

E.g. mplayer has the volnorm audio filter that does something to normalize the volume (I don't know whether it's strictly a compressor). You can use it on the command-line by the option

mplayer -af volnorm

If you want to use another movie player that doesn't have built-in support, you can do it on the audio system level. For ALSA, you could use LADSPA plugins as described here (containing specific instructions for using a compressor).

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up vote 3 down vote accepted

It looks like the built-in Audio normalizer of VLC Player did the trick. Ty!

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