Ultra HD: Live From the 2015 HPA Tech Retreat
As I write this, it is the morning of Day 2 at the annual Hollywood Post Alliance Tech Retreat. This annual conference brings together the top minds across a wide range of disciplines in the media production business. Cameras, lenses, codecs, displays, file formats and exchanges, content protection, archiving – they’re all here, as are representatives from the major studios, TV networks, software companies, colleges, universities, government agencies, and standards organizations.
Many of the sessions over the past few days have focused on next-generation television – specifically, capturing, editing, and finishing 4K images. Hand-in-hand with these additional pixels comes high dynamic range (HDR), which was prominently featured at CES in January. There’s also a new, wider color space (ITU BT.2020) to deal with, along with higher frame rates (how does 120 Hz grab you?).
I present a review of the Consumer Electronics Show every year at HPA (which now stands for the Hollywood Professional Alliance), and try my best to cram as much as I can in half an hour. Obviously, HDR was a big part of my presentation. And the overemphasis on HDR at CES provided a nice contrast to the presentations at HPA – at CES, it’s all about marketing hype, while at HPA, it’s all about engineering and making things work.
The average Joe may not understand much about “4K TV” or Ultra HD, but there is definitely more than meets the eye. At CES, an announcement was made about the new UHD Alliance, a partnership of TV manufacturers (Samsung, Sony, Panasonic), Hollywood studios (Disney, Warner Brothers, Fox), and other interested parties that include Netflix, Dolby, DirecTV, and Technicolor.
All well and good, but you need to understand the primary function of this Alliance is to promote the sale of Ultra HD televisions. And right now, television sales haven’t been as strong as they were five years ago. (The introduction of Ultra HD did boost sales a bit in 2014, which may have provided the impetus for the UHD Alliance.)
So here are a few of the problems with transitioning to Ultra HD. First off, not all of the pieces are in place for implementing add-ons like HDR, wider color gamuts, deeper color, and higher frame rates. It’s nice to talk about these features in conjunction with Ultra HD, but the mastering and delivery standards for HDR 4K movies and TV programs haven’t even been finalized yet.
Color is a particularly tricky issue, as LCD TVs with LED backlights render colors differently than LCD TVs equipped with quantum dot backlights. And OLED TVs require their own look-up tables as they are emissive displays, not transmissive. As far as frame rates go, consumer TVs generally can’t handle anything faster than 60 Hz and in fact prefer incoming signals to match up to one of four harmonically-related clock rates.
Next, there is a new version of copy protection coming to your television in the near future. It’s known as HDCP 2.2, and will ride along on an HDMI 2.0 connector. It is not backward-compatible with current versions, and you may be surprised to learn that early models of 4K TVs don’t support HDCP 2.2 yet. So there is a real compatibility problem lurking in the shadows if you are an early adopter.
You may be wondering where 4K Blu-ray content will come from. The first Ultra HD BD player was shown at CES, and you can expect those to show up late in the 4th quarter of this year. Suffice it to say that they will be running HDCP 2.2 on their HDMI outputs! Media players will also have to adopt version 2.2 if they are to access movies and other protected content.
Getting back to HDMI: Although version 2.0 was announced in September 2013, it’s pretty scarce on Ultra HDTVs. Most current-model sets I’ve seen have one or two HDMI 2.0 inputs, and as I just mentioned, many of those don’t support HDCP 2.2 yet. HDMI 2.0 is also speed challenged; with a maximum clock rate, it can’t support signals beyond 3840x2160p/60 with 8-bit RGB color.
Because of that, some UHDTV manufacturers are quietly adding DisplayPort 1.2 inputs to their products. Some of these interfaces are intended for connections to proprietary media players, but others are available for connections to set-top boxes, computers, and laptops. DP 1.2 can support 3840x2160p/60 with 10-bit RGB color as it has a much higher clock rate.
In summary, it’s all well and good that UHDTV is here, and initial sales are encouraging. But the plane isn’t finished yet, even though some of us want to fly it. The HPA presentations I’ve heard and seen the past two days clearly point out all of the back room details that have to be addressed before the media production, editing, mastering, and delivery ecosystem for UHDTV is ready to roll…
Posted by Pete Putman, February 12, 2015 3:12 PM
About Pete PutmanPeter Putman is the president of ROAM Consulting L.L.C. His company provides training, marketing communications, and product testing/development services to manufacturers, dealers, and end-users of displays, display interfaces, and related products.
Pete edits and publishes HDTVexpert.com, a Web blog focused on digital TV, HDTV, and display technologies. He is also a columnist for Pro AV magazine, the leading trade publication for commercial AV systems integrators.