APT pinning fails - updated for policy output

acolomb@multilus:/etc/apt$ cat preferences
Explanation: Only install package updates from deb-multimedia.org manually
Package: *
Pin: release l="Unofficial Multimedia Packages"
Pin-Priority: 99
acolomb@multilus:/etc/apt$ apt-cache policy libavcodec-dev
libavcodec-dev:
  Installed: 6:0.8.3-5
  Candidate: 7:0.11.1-dmo3
  Version table:
     7:0.11.1-dmo3 0
        990 http://ftp-stud.hs-esslingen.de/pub/Mirrors/debian-multimedia/ testing/main amd64 Packages
     6:0.8.99-1537-gacb2c79-2 0
          1 http://ftp.de.debian.org/debian/ experimental/main amd64 Packages
 *** 6:0.8.3-5 0
        500 http://ftp.de.debian.org/debian/ unstable/main amd64 Packages
        100 /var/lib/dpkg/status
     6:0.8.3-4 0
        990 http://ftp.de.debian.org/debian/ testing/main amd64 Packages
acolomb@multilus:/etc/apt$
acolomb@multilus:/etc/apt$ apt-cache policy
Package files:
 100 /var/lib/dpkg/status
     release a=now
 500 http://ftp.de.debian.org/debian/ experimental/non-free Translation-en
 500 http://ftp.de.debian.org/debian/ experimental/main Translation-en
 500 http://ftp.de.debian.org/debian/ experimental/contrib Translation-en
   1 http://ftp.de.debian.org/debian/ experimental/contrib amd64 Packages
     release o=Debian,a=experimental,n=experimental,l=Debian,c=contrib
     origin ftp.de.debian.org
   1 http://ftp.de.debian.org/debian/ experimental/non-free amd64 Packages
     release o=Debian,a=experimental,n=experimental,l=Debian,c=non-free
     origin ftp.de.debian.org
   1 http://ftp.de.debian.org/debian/ experimental/main amd64 Packages
     release o=Debian,a=experimental,n=experimental,l=Debian,c=main
     origin ftp.de.debian.org
 500 http://www.phoronix-test-suite.com/releases/repo/ pts.debian/ Packages
     origin www.phoronix-test-suite.com
 500 http://ftp.de.debian.org/debian/ unstable/non-free Translation-en
 500 http://ftp.de.debian.org/debian/ unstable/main Translation-en
 500 http://ftp.de.debian.org/debian/ unstable/contrib Translation-en
 500 http://ftp.de.debian.org/debian/ unstable/contrib amd64 Packages
     release o=Debian,a=unstable,n=sid,l=Debian,c=contrib
     origin ftp.de.debian.org
 500 http://ftp.de.debian.org/debian/ unstable/non-free amd64 Packages
     release o=Debian,a=unstable,n=sid,l=Debian,c=non-free
     origin ftp.de.debian.org
 500 http://ftp.de.debian.org/debian/ unstable/main amd64 Packages
     release o=Debian,a=unstable,n=sid,l=Debian,c=main
     origin ftp.de.debian.org
 990 http://ftp-stud.hs-esslingen.de/pub/Mirrors/debian-multimedia/ testing/non-free amd64 Packages
     release v=None,o=Unofficial Multimedia Packages,a=testing,n=wheezy,l=Unofficial Multimedia Packages,c=non-free
     origin ftp-stud.hs-esslingen.de
 990 http://ftp-stud.hs-esslingen.de/pub/Mirrors/debian-multimedia/ testing/main amd64 Packages
     release v=None,o=Unofficial Multimedia Packages,a=testing,n=wheezy,l=Unofficial Multimedia Packages,c=main
     origin ftp-stud.hs-esslingen.de
 990 http://security.debian.org/ testing/updates/main amd64 Packages
     release o=Debian,a=testing,n=wheezy,l=Debian-Security,c=main
     origin security.debian.org
 500 http://ftp.de.debian.org/debian/ testing/non-free Translation-en
 500 http://ftp.de.debian.org/debian/ testing/main Translation-en
 500 http://ftp.de.debian.org/debian/ testing/contrib Translation-en
 990 http://ftp.de.debian.org/debian/ testing/contrib amd64 Packages
     release o=Debian,a=testing,n=wheezy,l=Debian,c=contrib
     origin ftp.de.debian.org
 990 http://ftp.de.debian.org/debian/ testing/non-free amd64 Packages
     release o=Debian,a=testing,n=wheezy,l=Debian,c=non-free
     origin ftp.de.debian.org
 990 http://ftp.de.debian.org/debian/ testing/main amd64 Packages
     release o=Debian,a=testing,n=wheezy,l=Debian,c=main
     origin ftp.de.debian.org
Pinned packages:
acolomb@multilus:/etc/apt$ ^C