RealVideo 4
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- FourCC: rv40
- Company: Real
- High level whitepaper: https://datatype.helixcommunity.org/2003/codecdocs/rv9_tech_overview_v1_5.pdf
- Samples: http://samples.mplayerhq.hu/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.