To facilitate real-time streaming, RealVideo (and RealAudio) normally uses constant bit rate encoding, so that the same amount of data is sent over the network each second.
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However, the open source MPlayer project has now developed software capable of playing the RDT streams. This tactic has drawn criticism because it made it difficult to use RealVideo with other player and server software. The actual video data is sent with their own proprietary Real Data Transport (RDT) protocol. However, RealNetworks uses RTSP only to set up and manage the connection. RealVideo can be played from a RealMedia file or streamed over the network using the Real Time Streaming Protocol (RTSP), a standard protocol for streaming media developed by the IETF.
These identifiers have been the source of some confusion, as people may assume that RV10 is RealVideo version 10, when it is actually the first version of RealVideo. RV30 and RV40 are RealNetworks' proprietary H.264-based codecs. RV10 and RV20 are the H.263-based codecs. RealVideo codecs are identified by four-character codes. RealVideo continued to use H.263 until RealVideo 8, when the company switched to a proprietary video format. However, support for ClearVideo quietly disappeared in the next version of RealVideo. At the time, RealNetworks issued a press release saying they had licensed Iterated Systems' ClearVideo technology and were including it as the RealVideo Fractal Codec. The first version of RealVideo was announced in 1997 and was based on the H.263 format.
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