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Written by Oleksandr Gavenko (AKA gavenkoa), compiled on 2017-01-30 from rev ccaa2f364422+.

mplayer.

Increase volume above sound cards maximum volume.

$ mplayer -af volume=<v>:<sc> media.avi

<v> is the desired gain in dB for all channels in the stream from -200dB to +60dB, where -200dB mutes the sound completely and +60dB equals a gain of 1000 (default: 0).

<sc> Turns soft clipping on (1) or off (0). Soft-clipping can make the sound more smooth if very high volume levels are used. Enable this option if the dynamic range of the loudspeakers is very low.

Maximizes the volume without distorting the sound:

$ mplayer −af volnorm media.avi