Right, so.. your only option would be a software mixer, mplayer supports this via the
-softvol argument.
Quote:
Originally Posted by mplayer
-softvol Force the use of the software mixer, instead of using the sound card mixer.
-softvol-max <10.0-10000.0> Set the maximum amplification level in percent (default: 110). A value of 200 will allow you to adjust the volume up to a maximum of double the current level. With values below 100 the initial volume (which is 100%) will be above the maximum, which e.g. the OSD cannot display correctly.
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Hope it helps.