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mplayer: consistent (physical) volume on set of files

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linux-howto

http://unix.stackexchange.com – If I have, say, 20 music videos (.flv and .mp4), is there a way to play them in mplayer (mplayer2) without having to change the volume for each video, instead specifying a desired general volume, and having mplayer adjusting automatically whenever necessary? (HowTos)