I've heard that the BBC is going to be rationalising their control room infrastructure over the next few years - bringing CCA and Centralised Coding & Multiplexing back in-house (they're currently run by Atos, having been part of the BBC Technology sell-off 10 years ago), and their operations will eventually be merged with the BH radio & TV control rooms.
Does that mean taking back control of channel playout, or does Red Bee/Ericsson still control that?
And I assume that would mean they'd ingest ITV HD, Channel 4 HD and Film 4+1 for BBCB before sending it out to Arqiva to the transmitters.
I think you are confusing playout with distribution. Ingest is a playout function,
AIUI the following is the current division of responsibilities.
Ericsson (formerly known as Red Bee Media, formerly known as BBC Broadcast) handle channel playout for BBC, ITV, C4 and other channels in the UK. They will ingest the pre-recorded material (which is delivered on tape or via a DPP compliant AS11 AVCi 100Mbs file) and accept incoming live feeds from studios and OBs (I think - though this may not be the case - that ATOS handle the incoming and outgoing lines operation for Ericsson) They will operate the channel playout - working with scheduling teams from the broadcasters - to create the channels that are then routed elsewhere for distribution..
Atos (formerly Siemens, but who sold that bit of their operation to Atos. That bit being originally BBC Technology before being bought from the BBC by Siemens) handle the BBCs lines infrastructure (including the large Raman video contribution network) and satellite uplink and downlink, as well as their DSat and DTT
coding and mux operations that take the (baseband I think) channel feeds (BBC SD, and BBC, ITV, C4 HD) and encodes them for transmission. I believe Atos also handle the DSat uplink.
Arqiva (which is a final merger of what was the BBC and IBA TV transmitter operation - which was sold to Crown Castle and NTL respectively) handle the fibre distribution to transmitters and the DTT transmission.