And mpeg4 derives from mpeg2, and AVC from ASP, and...
Come on, all those codecs are block based, so of course they are closely related. As for RV, RV10 is more different from ASP, and isn't decoder by the same decoder in ffmpeg ( I checked the code source, the encoder shares some common code, as does most of the encoders in ffmpeg, but not the decoder )
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