I have been having stability problems with my Myth backend and primary front end so I went for a upgrade.
yum upgrade \*myth\*
This worked perfectly except MP4’s would not play anymore. Normally this would not be an issue except almost everything I have is in MP4 (H264) with (AAC) audio. It took a little time to find the solution and I messed with all kinds of menu’s and such in the end it turns out a symlink is missing:
ln -s /usr/lib/libfaad.so.0 /usr/lib/libfaad.so
Then they magically worked.
The upgrade also changed a log of functionality which can be a learning curse read up before you upgrade.