RMVB File Format
RMVB (RealMedia Variable Bitrate) is a variable bitrate extension of the RealMedia multimedia container format which developed by RealNetworks. RealMedia uses compression similar to MPEG-4 Part 10 encoders and are extremely popular for distributing Asian content, especially Chinese television episodes and movies.
.rmvb file extension have smaller file size and lower bitrates with better quality than many of the older/traditional formats such as DivX. Only some software can open and play RMVB files like RealNetworks RealPlayer and VLC Media Player on Windows, Mac and Linux platform. So if you want to convert, edit or share RMVB videos, you can convert them to popular format like AVI, WMV, MP4, MOV, etc following the guides about RMVB.
RMVB Compression: AVI vs RMVB /