Debian ist gut und recht, aber leider ist die ganze Geschichte mit Multimedia-Tools auf Grund von Problemen mit geistigem Eigentum unnötig kompliziert.

Das führt dann auch mal zu einer solchen Flut von Fehlermeldungen, wenn man den mencoder benutzen möchte:

$ mencoder
/usr/bin/mencoder: /usr/lib/i686/cmov/libswscale.so.0: no version information available (required by /usr/bin/mencoder)
/usr/bin/mencoder: /usr/lib/i686/cmov/libpostproc.so.51: no version information available (required by /usr/bin/mencoder)
/usr/bin/mencoder: /usr/lib/i686/cmov/libavutil.so.50: no version information available (required by /usr/bin/mencoder)
/usr/bin/mencoder: /usr/lib/i686/cmov/libavcodec.so.52: no version information available (required by /usr/bin/mencoder)
/usr/bin/mencoder: /usr/lib/i686/cmov/libavformat.so.52: no version information available (required by /usr/bin/mencoder)
/usr/bin/mencoder: relocation error: /usr/bin/mencoder: symbol av_reverse, version LIBAVUTIL_50 not defined in file libavutil.so.50 with link time reference

Das Problem konnte ich schlussendlich lösen, indem ich folgende Zeilen wieder in die /etc/apt/sources.list aufnahm:

...
# mplayer
deb		http://www.debian-multimedia.org squeeze main
deb-src		http://www.debian-multimedia.org squeeze main
...

Anschliessend ein apt-get update && apt-get upgrade. Irgendwann einmal waren dann nur noch zwei Fehlermeldungen zu sehen:

$ mencoder
/usr/bin/mencoder: /usr/lib/i686/cmov/libavcodec.so.52: no version information available (required by /usr/bin/mencoder)
/usr/bin/mencoder: /usr/lib/i686/cmov/libavformat.so.52: no version information available (required by /usr/bin/mencoder)

Doch dieses Problem schien nun unmöglich zu lösen zu sein:

# apt-get install ffmpeg libavcodec52 libavdevice52 libavformat52 libavfilter1
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 ffmpeg : Depends: libavfilter1 (>= 5:0.6.1+svn20101128) but 4:0.6.2-3 is to be installed
 libavfilter1 : Depends: libavcodec52 (< 4:0.6.2-99) but 5:0.6.1+svn20101128-0.2 is to be installed or
                         libavcodec-extra-52 (< 4:0.6.2-99) but it is not installable
                Depends: libavutil50 (< 4:0.6.2-99) but 5:0.6.1+svn20101128-0.2 is to be installed or
                         libavutil-extra-50 (< 4:0.6.2-99) but it is not installable
                Depends: libswscale0 (< 4:0.6.2-99) but 5:0.6.1+svn20101128-0.2 is to be installed or
                         libswscale-extra-0 (< 4:0.6.2-99) but it is not installable
E: Broken packages

Die Lösung:

/etc/apt/preferences:

...
Package: *
Pin: origin www.debian-multimedia.org
Pin-Priority: 600

und dann:

# apt-get install -t unstable ffmpeg