RMVB is a file format with a variable bitrate developed by RealNetworks. Actually it is an improved version of RM format. It gives greater bandwidth to videos that are difficult to compress. The extension keeps a high video definition. RMVB files are very popular in Asia and they are not supported by all popular players, so the easiest way to playback them is to convert them to another most common format.

MTS is a high definition video extension developed by Sony and Panasonic companies for their high-definition consumer video cameras. Later these companies joined their forces in the Blu-ray Disc Association. AVCHD technology supports 720p and 1080i resolution. The format uses MPEG-2 or MPEG-4 codec for video compression and Dolby Digital AC-3 for audio compression. Blu-Ray players can playback MTS videos without compression.