Originally Posted by mexican-bum
The directv Genie DVR has 5 independent tuners, rumor has it it will need 2 tuners simultaneously to watch live 4k once available due to its massive bandwidth.
That's a very odd rumour. I'm happily tuning a DVB-S2 HEVC 4K test broadcast from Astra at 28.2E in the UK with TBS PCI-E and Technisat USB DVB-S2 transponders. Similarly my Sony UHD TV set, which has integrated DVB-S2 tuners, is also tuning the Astra UHD tests with no problems. That's live-to-air UHD (aka 4K) in HEVC.
Unless DirecTV are going to be using a new version of DVB-S2 like S2X then the bandwidth of the transponder is unlikely to change. The video data rate may well be higher than before but nothing mad that a current S2 demod and demux can't handle - unless the DirecTV stuff is very shonky.
I guess you could be in a situation where the Genie can't use all 5 tuners simultaneously to record because the disk bandwidth would be too high to record 5 x UHD streams rather than 5 x HD streams - so rather than it needing 2 tuners, it just stops one being used when another is tuning 4K to limit disk bandwidth?
For info - the BBC UHD tests (which were OTA using DVB-T2 rather than DVB-S2 over satellite) over the summer last year for the World Cup and Commonwealth Games used HEVC at 2160/59.94p and 2160/50p at around 38Mbs. The Astra test broadcasts are at around 20Mbs. I expect a formal service will be somewhere in between?
When H264 1080/50i broadcasts started in Europe around 2006, it wasn't uncommon for them to use 16-18Mbs for an HD signal - so the bandwidth used for UHD HEVC isn't that massive...
When did the Genie launch? It must have been recently if it included HEVC / H265 hardware decoding for 4K reception.