[MPlayer-users] copy but increase the volume

[Adam Nielsen]

> if i encode the sound with lamecodec for exemple, i can increase the 
> volume, but for a opera or musical movie or the movie i want, if want to 
> keep the original ac3 sound how should i process ?

The only way to do this is to decode the audio, amplify it, then encode it 
again (thus losing a lot of quality in the process.)  You'd be far better off 
leaving it as is and relying on the player to alter the volume during 
playback (that's what volume controls are for, after all ;-))

Cheers,
Adam.