On a fresh 12.04 installation I wanted to install the ubuntu-restricted-extras. Therefore it needs to remove libavutil51 and libavcodec53. So, as there will be installed libavutil-extra-51 and libavcodec-extra-53, is it a simple substitution or is it a dependency bug, a conflict between the two versions...? Thanks.
PS: btw, what's the difference between the 'normal' and the 'extra' version?