Question: what is xvid and avi?
Answer: An XVID file uses the Xvid codec. It's not a video format like MP4, but instead, it's a program that's used to compress and decompress video to MPEG-4 ASP, a compression standard, to save on disk space and file transfer speeds. ... avi for an AVI file, for example. Xvid is distributed under the GPL free software license.