To clarify:
Kleiman-ibook:trunk michael$ port search xvid
xorg-libXv @1.0.4 (x11, devel)
X.org libXv
xorg-libXvMC @1.0.4 (x11, devel)
X.org libXvMC
xorg-videoproto @2.2.2 (x11, devel)
X.org videoproto
XviD @1.1.3 (multimedia, devel)
High performance and high quality MPEG-4 video library
Found 4 ports.
Kleiman-ibook:trunk michael$ port search theora
libtheora @1.0 (multimedia)
Xiph.org Foundation's open video codec
oggsplit @0.1.0 (audio)
Split multiplexed (grouped or chained) Ogg files into separate streams
py-mutagen @1.15 (python, audio, devel)
A Python module to handle audio metadata
py25-mutagen @1.15 (python, audio, devel)
A Python module to handle audio metadata
Found 4 ports.
So libtheora looks like a candidate, but then there's two xorg candidates, and an xvid candidate.
So what's the one that I want? (This isn't my area of expertise :-)