I recently upgraded a media-PC from 12.04 to 14.04. Now the audio-filter -af volnorm=2:0.25 of mplayer does not seem to work any more. The filter is accepted by the command-line, but just doesn't dynamically adjust the volume as before. I tried to place it on different points in the filter chain, tried different values according to the man page, and verified using -v that it is initialized during start. Other audio filters I use in the same filter chain, like channel or pan still work, so the chain itself seems to be processed.

Is there maybe a 3rd party repository/built of a more recent version of mplayer I could try? Can I revert to the 12.04's mplayer somehow?

(I am not really interested to switch to another player that also supports dynamic volume change.)