rmvb The .rmvb filename extension refers to the RealMedia variable bitrate format which is an extension of the RealMedia multimedia container format. RMVB is a proprietary multimedia digital container developed and maintained by RealNetworks, an internet streaming Media Company. It is different from its closely related format .rm in that it was designed for distribution of complete multimedia content, however it does support real-time media streaming. Video and Audio streams can be encoded and packaged into this format and distributed as single files for later playback on compatible devices and software as opposed to file streaming on high bandwidth networks.
mpeg Being the most broadly compatible audio and video container format from the lossy class of containers, the MPEG standards are supported by numerous audio and video products and software applications. The standards were designed to meet the growing need for digital storage of audio and video media. They both utilize a lossy compression to scale down VHS quality digital video and CD audio. The two formats, mpeg-1 and mpeg-2, are the result of the combined efforts of the moving picture experts group which was established in 1988. The mpeg-1 has its beginnings in the same year, with an initial release to public in 1993.