ffmpeg issues

If I try to mix freshrpms and livna repos on F7 I get irritating 
conflicts that involve libdts and the like. I'm not the only one. For 
example, here's a very similar issue:

http://www.linuxquestions.org/questions/showthread.php?t=563670

If I disable freshrpms altogether, I manage to install vlc and mplayer 
and such, but that's just ignoring the problem.

Another problem, and I don't know whether the root cause is the same, 
but perhaps it is, is that gstreamer doesn't play some AAC/MP4 files for 
me that it should be able to play. (Xine plays them OK.)

Is there something fishy with ffmpeg, faad2 and friends? I don't really 
understand all those interdependencies, I just want my tunes to rock. :)