RealVideo 4

• FourCC: rv40
• Company: Real
• Samples: http://www.mplayerhq.hu/MPlayer/samples/real/VC-RV40/

RealVideo 4 is available in RealPlayer starting with version 9. RealVideo 10 (introduced with RealPlayer 10) uses the same RV40 video format, and can be played by RealPlayer 9 decoder. All Realvideo 10 enhancements are in the encoder.

RV40 is suspected to be based on H.264.