Christian Marillat has maintained an unofficial repository of Debian
packages
relating to multimedia applications for several years; cf.
http://debian.video.free.fr/
He's now set up an amd64 version of the repository:
deb http://cyberspace.ucla.edu/marillat/ unstable main
The repository is working, but the packages have just been built for
the first time
and there may be issues. Major packages include ffmpeg, mjpegtools,
mplayer,
qdvdplayer, and transcode.
For legal reasons, libdvdcss will be available from:
deb ftp://ftp.nerim.net/debian-marillat/ unstable main
Some of the upstream applications are still being ported, for
instance xvid and
transcode, so YMMV, but let Christian (not BTS) know if there are
problems with
the packaging.