XFree 4.1.0 or later and a graphics card and drivers with Xvideo (Xv) support.
A DVD drive, make sure you have DMA and other relevant options enabled for better performance.

libdvdcss - to play encrypted DVDs
libjpeg - Screen shots are saved as JPEGs
libxml2 - Config files are XML formated
libmad - MPEG audio decoding is done with MAD
liba52 - for audio decoding
libdvdread - Ogle 0.7.4 and later needs libdvdread-0.9.x
Ogle_gui - add-on graphical user interface for Ogle
xvattr - a small command line program to change Xv attributes like brightness, contrast,...Obviously you need to have Xv for this to work.

A fast computer (PII 450 / Dual UltrasparcII 400 or an UltrasparcIII)