Xvid (formerly 'XviD') is a video codec library following the MPEG-4 video coding standard, specifically MPEG-4 Part 2 Advanced Simple Profile (ASP). It uses ASP features such as b-frames, global and quarter pixel motion compensation, lumi masking, trellis quantization, and H.263, MPEG and custom quantization matrices.
Is a recording format, designed for use in movie theaters. Who is a direct competitor of Dolby Digital. It is used to accompany the film with the movie, as well as on optical video discs. It supports two modes of audio: 5.1 and 7.1, allows full bit rate in high end home theaters.