NBC Sports Group Embarks on New 4K HDR Frontier With Notre Dame Football Peacock is creating both HDR and SDR feeds via a single-stream, one-truck production model By Jason Dachman, Chief Editor
Thursday, September 27, 2018 - 11:06 am
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Just two years after blazing the 4K-production trail with its Notre Dame football package, NBC Sports Group is at it again in South Bend, IN - this time with HDR. NBC is delivering every Fighting Irish home game this season in 4K HDR (games are produced in the truck in 1080p HD, then upconverted to 4K HDR for distribution exclusively to AT&T's DirecTV subscribers), marking the first multigame football package to be produced in HDR and the most significant commitment to next-gen technology by any U.S. broadcaster to date. And NBC is even producing all games from Notre Dame Stadium in Dolby Atmos audio.
NBC's primary goal in embarking on this HDR endeavor was to create a single-stream workflow using one truck for both the 1080p HDR and the 1080i SDR feeds, avoiding the need for costly side-by-side mobile units.
Notre Dame Stadium became the first college football stadium to get weekly 4K HDR treatment this season, courtesy of NBC Sports Group.
We set out to try to figure out how we could do this as a single-stream production, says Dave Mazza, SVP/CTO, NBC Sports Group and NBC Olympics. A lot of [broadcasters], including us, have done side-by-sides of both 4K and recently 4K HDR, but that wasn't our goal here. We felt, as an industry, that we all have to figure out how to [produce HDR and SDR] with a single-stream production, or it's not going to be possible to maintain HDR as a long-term viable format. So that's what we targeted. Our Sony friends having been telling us since the our Rio Olympics 4K HDR effort that it will work. We've done it three times now and feel we're on the right path.
HDR Dress Rehearsal: Testing Out Workflows in Chicago
Prior to Notre Dame's primetime opener against Michigan on Sept. 1 (followed by Ball State and Vanderbilt the next two weeks and Stanford this Saturday), the NBC Sports engineering team headed to Chicago to test out its HDR workflows on two White Sox games at Guaranteed Rate Field and a Cubs game at Wrigley.
We had no production people, just engineers and three cameras, says Terry Adams, VP, NBC Olympics Engineering. We were just making sure that the primary HDR workflows that we had put together worked before we went live.
Adds Craig Bernstein, senior director, remote technical operations and engineering, NBC Sports, One of the coolest aspects of this project was collaborating with all of our vendors throughout the entire process, some of them literally writing code up until the last minutes. What's interesting is that, as an industry, hardly anyone is a true expert in this, so it was rewarding to solve the litany of challenges as a group, all learning together.
Mantra Remains Do No Harm to the SDR'
NEP's ND6 mobile production unit - converted to HDR-capable in just 45 days prior to the primetime opener - is producing an HDR feed, which is downconverted to 1080i SDR for the main HD telecast. NBC opted to use HLG (hybrid log gamma) as its HDR format and is leveraging Sony's HLG Live output mode to facilitate end-to-end HLG production.
Our mantra was do no harm to the SDR,' says Mazza, but I think all of us were pleasantly surprised with how good the HDR looked right away. A lot of work was done regarding how to convert from SDR to HDR and back so that [the content] could make the roundtrip and look the same when it got back to SDR. For example, it was very important that the graphics and the Notre Dame jerseys looked proper in HDR and also looked correct in SDR. A lot of energy went into making sure that roundtrip survived.
NBC is deploying three Sony HDC-4300 cameras in native HDR mode and has installed 14 Sony HKCU-2040 4K/HDR processor boards into its existing Sony HDC-2500's to allow them to output HDR. The Peacock has 26 cameras in total, including several POVs and ancillary cameras being upconverted to HDR. All camera monitoring/shading is done in SDR in the truck.
We are shading solely in SDR, says Adams. The video guys have half a day to get this whole thing set up for each [game], so they just do their SDR show the way they always did. The HDR still looks striking, but they have to just do their same SDR show. I know there are some people who would say you have to shade in HDR, but, for a single-stream production, I don't think it's possible. When it comes to the extended range, you could make a stunning HDR picture that's all white-clipped in SDR. You can't do that; you kind of have to come at it the other way.
In terms of contribution, two paths leave the truck: a 1080i SDR feed is sent to NBC's 30 Rock playout facility in New York City for the network broadcast, and a 1080p HDR feed is sent to its Network Operations Center in Englewood Cliffs, NJ. At the NOC, the 1080P HDR feed is upconverted to 4K and encoded to Dolby Atmos; a dedicated 4K pod inserts commercials, which are upconverted to HDR. The 4K HDR program feed is then HEVC-mezzanine-encoded (via HEVC encoders provided by AT&T/DirecTV) and sent to DirecTV's Los Angeles Broadcast Center (LABC) for distribution exclusively to DirecTV subscribers. The engineering team at the NOC did a great job of building and testing the new 4K HDR pod there, according to Mazza.
We took a forward-looking view here because we're trying to get ready to do this for the long term, not just a one-off, he explains. 30 Rock was not ready to receive [an HDR feed], nor did we want them to have to. That's why the regular signal leaves the truck and goes into 30 Rock just like normal, and we built a 4K pod for [commer
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NBC Sports Group Embarks on New 4K HDR Frontier With Notre Dame Football Peacock is creating both HDR and SDR feeds via a single-stream, one-truck production model By Jason Dachman, Chief Editor 
