What is the difference between .rmvb and .sph?
- Extension
 - .rmvb
 - .sph
 
- Format
 - Binary
 
- Category
 - Video
 - Audio
 
- Developer
 - RealNetworks
 - NIST
 
- Description
 - An RMVB file is a Real Media video file compressed using a variable bit rate, which is optimized for the content of the video. It is a newer variation of the standard Real Media (.RM) file format that allows for more efficient compression.
 - Waveform audio file created in the NIST SPHERE format, which is often used in speech recognition research; often contains a recording of a person speaking; can be provided as input to speech recognition systems.
 
- MIME Type
 - application/vnd.rn-realmedia-vbr
 - audio/x-nist-sph
 
- Sample
 - sample.rmvb
 - sample.sph
 
- Wikipedia
 - .rmvb on Wikipedia
 - .sph on Wikipedia