What is XvidXvid is a video codec library following the MPEG-4 Part 2 standard. Xvid is a primary competitor of the DivX Pro Codec (Xvid being DivX spelled backwards). In contrast with the DivX codec, which is proprietary software developed by DivX, Inc., Xvid is free software distributed under the terms of the GNU General Public License
Why use Xvid
Xvid is a hugely popular codec, especially with the internet file sharing community and you will find at the majority of standard definition movies have been compressed using this format. Most of these videos will play on DivX certified devices except those that have been encoded using some of its advanced features. The Xvid codec is also free and has greater cross platform cabilities compared to that of DivX and WMV and is available on Windows, Mac and Linux. Since it is Open Source, it can be compiled for any number of Operating Systems.
Xvid has also a greater number of tools available for encoding videos than DivX although the quality and difficulty of they vary greatly.