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Just read an interesting article in the latest issue of 'TV Technology Europe' which details how RAI (Italian public service broadcaster) has trialled 4k production (using a Red One) and also trialled broadcasting it.
They used H264 and DVB-T2 - with 4 x 1920x1080/25p quadrants feeding four separate H264 encoders as profile 5.1 encoders (which would natively encode 4k as a single H264 stream) weren't available.
This allowed a 3840x2160/25p video stream to be sent in a single 36-40ishMbs DVB-T2 multiplex (which fits into a standard European 7-8MHz RF channel) - just as in the UK Freeview HD is using DVB-T2 to convert an 18Mbs DVB-T mux to 40Mbs DVB-T2 to carry 3 or 4 HD stations in a single mux.
They used H264 and DVB-T2 - with 4 x 1920x1080/25p quadrants feeding four separate H264 encoders as profile 5.1 encoders (which would natively encode 4k as a single H264 stream) weren't available.
This allowed a 3840x2160/25p video stream to be sent in a single 36-40ishMbs DVB-T2 multiplex (which fits into a standard European 7-8MHz RF channel) - just as in the UK Freeview HD is using DVB-T2 to convert an 18Mbs DVB-T mux to 40Mbs DVB-T2 to carry 3 or 4 HD stations in a single mux.