Aus der ML:
Hello list,
this is a slightly modified version of the mp3-plugin for people,
who would rather output the mp3/other sound over their soundcard.
Some people asked for it, and there it is:
http://home.pages.at/garvdr/vdr-mp3oss-0.8.0.tgz
Excerpt from the README:
This is a plugin for VDR.
The "MP3OSS-Plugin" allows playback of MP3 and other audio files
over a soundcard (/dev/dsp).
Modified by, for OSS output: Gunnar Roth <gunnar.roth@gmx.de>
Written by: Stefan Hülswitt <huels@iname.com>
Project's homepage: none
Latest version available at: none
See the file COPYING for license information.
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ATTENTION: This plugin is lacking the mplayer module. For this purpose
you can use the origninal mp3/mplayer plugin.
The mp3oss and mp3 plugin can be used in parallel.
Dont blame the original autor if you have problems with this plugin.
Even better if you dont blame me too 
You can set the sound dsp device file on the command line with option -D
or --dsp, default is /dev/dsp.
TV Video and audio is stays runnig while the mp3oss player runs,
if you select live Background Mode, but channel switching is not possible
with the channel keys.
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The following is the original readme of the mp3/mplayer plugin
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...
regards,
Gunnar
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Steffen