noggin's posts, page 84

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NG
noggin Founding member

Local TV

CrispyPotato posted:
Just a few random thoughts:

1) This may also have an impact for Comux's RFP for a new network.


Yes - the Comux network will need to be significantly different I suspect - as the RFP included circuits from all the current studio sites.

Interesting that the different operations seem to contribute to Comux in different ways (15Mbs ASI and 40Mbs J2K?) Plus some are sourced from Red Bee (i.e. Chiswick Park), Encompass and Newman St (I guess they are the stations that don't use Comux for playout - only transmission)?
NG
noggin Founding member

The Sport Thread

BM11 posted:
Who directs the shots of the royal box etc at Wimbledon. The host broadcasting service or BBC only cut in's?


I'd expect it to be host - I don't think the BBC have that many unilateral cameras on centre court, and I don't think the Centre Court director will want to direct their own cameras to be cut in by the BBC from ISOs.
NG
noggin Founding member

Repeat rights.

Brekkie posted:
Ultimately ITV only have a limited number of linear broadcast slots to air shows from its continually increasing archive from so if further revenue can be made by selling shows otherwise just sat in the archive collecting dust then it makes alot of sense.


Yes - and ITV's shareholders will want to maximise the value of their archive, just as the BBC is charged to for the programmes it owns.
NG
noggin Founding member

Repeat rights.

Ash101 posted:
The Syndicate’s first series has aired on ITV3 despite being a BBC One show. I think they even squeezed it into an hour slot, so must’ve done some edits to fit the breaks in too.


The Syndicate was an independent commission though, and after a certain period of time the rights for programmes made by independents (under PACT rules) reside solely with the production company who made it, not the BBC (*). That means they can sell it to whoever they want - though, to be fair, BBC Studios will sell repeats of BBC-owned shows too.

(*) This doesn't apply to shows previously made by the BBC (now BBC Studios) that the BBC has tendered to independents to produce (like Songs of Praise, Mastermind etc.) The right to those shows remain the BBC's, with the production company just being paid to produce the show.
NG
noggin Founding member

Tory Leadership Contest

mapperuo posted:
noggin posted:
Charlie Wells posted:
Worth noting that BBC Breakfast were live from the ITV set this morning, which was partially lit up. Not sure if GMB were also doing any broadcasts from the set, though I guess for the BBC it helped that the debate was taking place in Salford, presumably only a short walk from their Breakfast studio.


Yes - and there are permanent BBC circuits between Dock 10 and the BBC facilities in Quay House.


Interestingly however they used a sat truck, maybe easily to get the feed into NBH that way, as if it was any other news OB.


Yes - that can still be an easier option (as can using a WMT/Live U) as having tie-lines doesn't guarantee you will have the right bits of kit at each end to handle comms etc.
NG
noggin Founding member

ITV regional news service

Inspector Sands posted:
Aha, so the bit rate of the encoders is driven by the multiplexer? Makes sense I suppose. I think I assumed that the encoders produced a stream to the bit rate needed, up to a maximum level*. Then the multiplexer then fitted them all together, reducing the bit rates if need be


*I've only encoded stuff for when it's not being multiplexed, e.g. for a satellite uplink where you fix the transport stream rate but the video bitrate varies


Yep - whilst it is technically possible to reduce the bitrate of a compressed stream, the results are usually far from great (it's how some DVD shrinking programs used to get DVD9s into DVD5s ISTR without re-encoding) and you really have to encode at the target bitrate for decent quality. I think it gets even more difficult with h.264 and h.265 which don't have fixed block sizes.

Statmuxing delivers huge benefits, but it does come at a cost of requiring more encoders.

Before BBC One English regions were statmuxed, they were CBR encoded locally at 5.8Mbs with BBC Two England, BBC Three/CBBC, BBC Four/CBeebies and the BBC News Channel (not sure if Parliament was still elsewhere at this time) statmuxed centrally - reducing the number of encoders, but at the expense of less flexibility in the statmux.
Inspector Sands and London Lite gave kudos
NG
noggin Founding member

Tory Leadership Contest

Charlie Wells posted:
Worth noting that BBC Breakfast were live from the ITV set this morning, which was partially lit up. Not sure if GMB were also doing any broadcasts from the set, though I guess for the BBC it helped that the debate was taking place in Salford, presumably only a short walk from their Breakfast studio.


Yes - and there are permanent BBC circuits between Dock 10 and the BBC facilities in Quay House.
NG
noggin Founding member

Wimbledon 2019

commseng posted:
UKnews posted:
thegeek posted:
The BBC's main path out of Wimbledon is almost certainly by fibre - if they're skimping on a satellite contribution it'll be a "we hope to not have to use this but at least it'll keep us on air if we do" budgetary choice.

Satellite being the second reserve / emergency path has been the connectivity arrangement at other major sporting events for some time now. Wimbledon is definitely fibre main, not sure beyond that.


thegeek- I don’t think the main path from Wimbledon has ever been on satellite?

I would agree that Wimbledon used to be via microwave link into both Crystal Palace and also Swains Lane to provide diversity.
Plus when interactive started, the sheer number of circuits required both the London terminals to provide the link reception and circuits into TVC.


Yep - it switched to fibre (ISTR IP over fibre but I may be wrong?) quite a while ago now?
NG
noggin Founding member

Wimbledon 2019

thegeek posted:
The BBC's main path out of Wimbledon is almost certainly by fibre - if they're skimping on a satellite contribution it'll be a "we hope to not have to use this but at least it'll keep us on air if we do" budgetary choice.


Yep - I think the host broadcaster court feeds are all carried over fibre to IMG at Stockley Park who handle forward distribution to at least some rights holders? I think this is a Hypermux point for EBU FINE connectivity?
NG
noggin Founding member

Wimbledon 2019

http://www.digitalbitrate.com/dtv.php?mux=10847&pid=6941&live=69&sec=0&lang=en BBC One HD on 28.2E averages around 4.5Mbs with peaks of up to 17Mbs.

http://www.digitalbitrate.com/dtv.php?mux=BBCB-PSB3&pid=17540&live=9&sec=0&lang=en BBC One HD on PSB3 DVB-T2 is similar.

Sure - statmuxing can push channels below their average - but that's what statmuxing is for. (The court wide shot on Wimbledon will compress very well)

That said - the UHD HDR MPEG DASH iPlayer Centre Court stream is 7Mbs 720p50, 10Mbs 1080p50, 16Mbs 1440p50 and 36Mbs 2160p50 - and that's using HEVC/h.265 which is more efficient than the h.264/AVC used on DSat and DTT in the UK (though the HEVC encoders may not be as advanced yet)...
NG
noggin Founding member

ITV regional news service

London Lite posted:
noggin posted:


In other countries (France and Italy for example) they are using DVB-S2 multi stream distribution to carry multiple muxes on a single transponder, rather than distributing via fibre ISTR. However if there are any regionalised channels that are slotted in, they will have to be CBR, with only the other channels statmuxed with each other (akin to how BBC One SD in England used to be handled on PSB1?).


France 3 must be an absolute joy to distribute with all their regional opts?


Yep if you look at the Atlantic Bird 5W transponder that carries three DVB-T French muxes : https://en.kingofsat.net/tp.php?tp=1287 you'll see France 3 Sat is carried (which is also carried on some of the DTH platforms I think). I suspect it is CBR and replaced at the transmitter with a local feed?

RAI do something different in Italy for RAI 3 in that they carry them separately on satellite - I guess for the transmitter to integrate : https://en.kingofsat.net/tp.php?tp=6579

The main DVB-T mux feed carries RAI 3 Liguria, but there are separate streams carrying other RAI 3 variations. I guess they are CBR and the transmitter does a basic re-mux - or uses a dual PLP solution to carry two transport streams on one DVB-T mux?

In fact checking digitalbitrate.com for what is being received on DVB-T in France and Italy seems to confirm this.

The French R1 mux carries FR3 Paris (and local channel BFM Paris) at CBR according to http://www.digitalbitrate.com/dtv.php?liste=1&live=1&lang=fr&mux=R1%2CIDF whereas the other channels are statmuxed. I guess the satellite distribution includes 'space' for FR3 and local channels (and if there are no local channels null packets are used to fill the gap?)

Similarly in Italy on the Rai 1 mux, Rai 1 and 2 are statmuxed with each other, but Rai 3 is CBR (as is Rai News 24?) http://www.digitalbitrate.com/dtv.php?liste=1&live=34&lang=fr&mux=RAI-1
Last edited by noggin on 8 July 2019 12:49pm - 4 times in total
NG
noggin Founding member

ITV regional news service

Technologist posted:
The issue is that with stat muxing the feed to each transmitter group requires say 7 coders ....
BTW Sat distribution is only very effective when there are multiple transmitters like national DAB ..


Yes - in theory the COM 4-8 muxes could be distributed via satellite if you were starting from a blank sheet of paper, but as the dual redundant fibre distribution is there already it's kind of pointless to move to satellite.

In other countries (France and Italy for example) they are using DVB-S2 multi stream distribution to carry multiple muxes on a single transponder, rather than distributing via fibre ISTR. However if there are any regionalised channels that are slotted in, they will have to be CBR, with only the other channels statmuxed with each other (akin to how BBC One SD in England used to be handled on PSB1?).
Last edited by noggin on 8 July 2019 12:48pm