何謂DIVX??

DIVX is a audio codec. RMVB is a file format. For RMVB file, it can have any audio file embedded into it. If the audio requires DIVX codec to decode it, you will have to install DIVX decoder to get the sound out. RMVB files with DIVX audio can be played by RealPlayer but the audio part still requires DIVX codec to get sound.