Knowledge about rm/rmvb
As you know, these two kinds of formats, RM and RMVB, are less than superior in technology side. But as a result of their ubiquitous usage on the internet, these two formats have stayed as, with several other formats, indispensable types in the market. MP4 products at present are alleged to support many kinds of formats through self-enabled decoding ability, but not RM/RMVB, thus largely decreased practicability.
In this age of internet ubiquity, RM/RMVB as container of videos have dominated most PCs. To play RM/RMVB videos
requires decoding of files by some kind of soft, and adds to the demands for higher quality of chips in a portable video player. For PC, it must has a PIII level of CPU ,in order to support automatic decoding and playing ,while some video players, after some optimizations till now, have been able to support as high quality as QVGA for RMVB decoding.