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 binary stream media container format that combines several codecs of texts, subtitles, audio and video data. It can be used on web pages for video playback. It has a lot to do with the OGG format. Exists support for popular codecs MPEG-4 and MP3.