The all-in-one codec

Here is an all-in-one download for many of the popular codecs needed to decode/encode many video
and audio formats, including DivX and XviD movies using libavcodec,
xvid and other opensourced libraries with a rich set of postprocessing
filters.

I have used it so far to help me transfer unknown video/audio CD’s and DVD’s and it works great.

It’s free and it is Open Source.

http://sourceforge.net/projects/ffdshow