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Could you provide a reference for this SMPTE recommendation please.
I work primarily with uncompressed SDI interfaces. In the SMPTE documents that specify these (125M, 292M, 424M etc) the standard colour depth is 10 bit, which means 10 bits per component per pixel. That is 10 bits each for Y, Pb and Pr. When handling the signals as parallel data (before serialisation or after deserialisation) the interface can be specified as either 10 bit (with Y and C multiplexed on a single 10 bit bus) or 20 bit (with Y and C on separate 10 bit buses).
When compressing signals for transmission the MPEG2 or MPEG4/H264 encoder uses at least 8 of the 10 bits per pixel per component, depending on the profile.
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