libav backport for Wheezy

[Bálint Réczey]

Dear Debian Multimedia Maintainers,

In the last weeks I was busy with reviving XBMC in Debian and looking
at the package building fine for unstable I may have become overly
ambitious, I but started thinking about back-porting the latest
version to Wheezy after it migrated to testing.

The most important dependency of xbmc is libav and I'm wondering if
you could provide a back-port for it.

Thank you,
Balint