What do you do if another package was prepared for and tested with the newer version of mplayer?
Example: repo A (priority), repo B
"libfoo 1.0" is from repo A "libfoo 1.1rc2" is from repo B
"bar" from repo A was built and tested with libfoo 1.0 from repo A "baz" from repo B was built with libfoo 1.1rc2 from repo B
You install "bar + libfoo 1.0" from repo A, the higher libfoo 1.1rc2 is ignored due to prioritized Apt-pinning.
What happens if you want to install "baz"?
I pretty much aviod that by using priorities above 1000 which will install a package from a repository even if it is a downgrade.
I'm not sure on the semantics of upgrading and priorities below 1000. I will have to do some experiments.
Check out the apt_preferences manual page.
It's interesting that I was able to switch from mplayer from livana to mplayer from dag by changing the priority and running apt-get dist-upgrade.
Now I will have to learn how yum handles repository priorities...
