01 October 2024
Tech & Tools
By IAN FAILES
By IAN FAILES
Today there is more filmed entertainment on television and streaming services available than ever before. So many of these shows are filled with visual effects, creating a boon for many VFX studios.
The challenge for visual effects studios and artists, though, has been that these TV and streaming networks are continually pushing for higher quality deliveries in the realm of 4K and even 8K, which can actually be greater than required for film VFX. The budgets, meanwhile, are typically lower in comparison to film.
How have those in the visual effects industry responded to the new wave of streaming and television requirements from a technical, workflow and creative point of view? The answer is via a number of methods, from adopting new pipelines and software, to invoking real-time and virtual production tools.
First, a perspective from one of the big streaming services itself, Netflix. The service is well known for requiring creators of its Netflix ‘Originals’ to shoot and deliver in 4K, while its VFX best practice guidelines also state that ‘VFX pulls and deliveries must have an intended active image area of at least UHD (3,840 square pixels in width).’
“We put forth comprehensive guidelines about not only camera choice, but also recording settings: codec, compression, color space,” outlines Netflix Director of Creative Technologies and Infrastructure Jimmy Fusil. “We also provide support throughout the design of the ‘dailies-to-DI’ image workflow on every project. A big part of our efforts there is ensuring alignment between on-set monitoring, dailies, VFX and picture finishing.”
Fusil singles out The King, released in November 2019, as a recent production in which the camera choice, 4K color management workflow and VFX deliveries were heavily pre-planned. DNEG was the lead visual effects vendor. The film, shot on ARRI Alexa 65, had what Fusil says was a clearly defined color-managed workflow, with color decisions baked into editorial dailies. “So when it came to pulling the plates, the turnover package included LUT plus CDLs (ASC Color Decision List) per shot for the VFX vendors for them to use coming back into the editorial timeline. “Another part of the imaging pipeline that we encourage for VFX is to work in scene linear color space,” adds Fusil . “For The King, teams agreed upon an AWG linear color space exchanged in a 16bit half float EXR file format, which would then be transformed to an ACEScg working colorspace in-house, a widespread VFX facility format. For these files to be viewed by the artists and delivered back into editorial, LUT package included more substantial versions of the show LUT that transformed the ACEScg to AWG LogC to rec709.”
What this all meant for the VFX teams, suggests Fusil, is that they were not held up trying to match proxy files with the color in the editorial timeline, something that can happen in non-color managed image pipelines. “Plus,” he says, “having one consistent deliverable, AWG linear EXRs, meant that the final color process was very manageable, especially as we were overseeing the delivery of final shots to multiple locations. The DI was finished in New York, Australia and Los Angeles. Supporting the filmmakers and facilities on The King was a win for us. They were able to direct all their energy into the creative space and finish on time in Dolby Vision.”
So, has having to follow more stringent color workflows and deliver in 4K and above changed the approach within VFX studios? It certainly has, according to Image Engine Head of Technical Production Pascal Chappuis. His studio, which has worked on shows for Netflix, Disney+, HBO, Amazon Prime Video and other services, has had to specifically manage areas such as rendering and reviews.
In terms of the very practical impact of delivering higher resolution and more data, Chappuis advises this partly involved hardware upgrades. “The compositing machines, for example, needed to be accommodated with SSD (solid state drive) caches and bigger machines, just to make sure that 4K images, sometimes rendered in deep, could be worked on. Our machines for review in the theater were updated too; there’s just more data and more bandwidth required over our network. 4K impacts us, every step of the way.
“Sometimes we have had to ramp up the storage, because we thought we could off-line say Episode 1, but you can’t,” continues Chappuis. “They might come back and work on that episode later on. So, if you have lots of episodes, it can be like a 10-hour movie in a way, especially at 4K.”
Interestingly, one benefit of the advent of more episodic work, says Chappuis, is that deliveries have become somewhat more predictable than film. Still, he adds, “it is all about scale. When it all works, it seems that suddenly they can have more shots or more episodes in their pocket to give you. So you need to be able to scale quickly for shots and with crew.”
Another VFX studio that has taken on a greater range of television and streaming work is Hybride. President and Head of Operations Pierre Raymond observes that where film VFX and television VFX were once considered quite different, they have now become quite similar.
“Television series don’t have the same pace, as they are composed of many episodes, but 4K resolution is now standard,” he says. “This has had an important impact in the VFX industry, and the movie business is rapidly catching up. I’d say the main difference between the two is the pace and the expectations. That being said, if TV series come to have the same expectations in regards to quality and time investment, both challenges will not be approached differently.”
Server storage and network equipment received upgrades to handle 4K deliveries at Hybride, but, like Image Engine, few staffing changes were necessary. “All of our artists are involved on both types of projects, some of which sometimes overlap during the same period,” states Raymond.
We’ve seen, then, how delivery requirements for television and streaming services can impact on VFX studios. There’s another kind of change that’s also taking place in visual effects generally that is set to change – and in fact is already changing – the way TV and streaming shows are made: virtual production.
The use of LED screens and real-time rendering engines during the making of Disney+’s The Mandalorian is the standout example of virtual production at work. Using a combination of ILM’s StageCraft technology and Epic Games’ Unreal Engine, digital backgrounds could be pre-built for projection on the LED walls while actors performed directly in front of them. These backgrounds could be changed in real-time, effectively providing for full in-camera VFX shots (with no or little post-production necessary), as well as interactive lighting on the actors themselves. It also eliminated the need for greenscreens, although the LED walls could become greenscreens themselves.
This might mean more work up front to prepare the real-time ready imagery, but the idea is that it can all aid in helping the cast and crew to imagine scenes directly there on set, without the need to visit exotic locations. In addition, notes David Morin, Head of Epic Games Los Angeles Lab, “Art directors can visualize their sets faster up front and use VR for virtual location scouting, previs teams can interactively block out scenes and camera moves, VFX teams can iterate much more quickly on their environments and characters, and so on.
“Everyone on set of The Mandalorian was able to see the digital environments with their own eyes in real-time, giving the crew the ability to make on-the-fly changes and the actors real elements to react to,” adds Morin. “Even more possibilities opened up, whether it was the set dresser easily moving objects from one place to another within the digital environment, or the cinematographer having the ability to shoot with magic-hour lighting all day long.”
Morin believes that the use of virtual production in television and streaming production can, by doing more earlier, aim to reduce the post process, which might “also help shows go to air in shorter time frames, allowing studios to keep up with audience demand. The use of LED walls in particular, though it requires a large upfront investment, can ultimately deliver significant return on investment, as filmmakers can return to the set again and again throughout production and even later on for re-shoots without having to worry about location availability, weather conditions and other disruptive factors.”
The Volume shoot on The Mandalorian is one of the more elaborate examples of virtual production use in episodic work. Other virtual production and real-time rendering examples are becoming more widespread, such as via many previs studios, other LED screen implementations including Stargate Studios’ ThruView system, and the use of many on-set simul-cam and virtual camera systems. One example of the latter technology was adopted by Framestore for the signature polar bear fight in the HBO and BBC series His Dark Materials.
The fight was visualized and scouted with a real-time Unreal Engine asset of the environment and the bears, with Vanishing Point’s Vector virtual production setup then utilized on set to ‘film’ the fight. Its real-time camera tracking and live compositing abilities enabled immediate feedback for the VFX and production teams. His Dark Materials Visual Effects Supervisor Russell Dodgson is adamant that virtual production was the right tool for the right job on this demanding scene, especially as it went beyond his usual experience with previs.
“As we get more and more to a place where virtual production tools are really informing shot production rather than just early thoughts,” says Dodgson, “I think they can really gain relevance. Having real-time tools that give you good-looking feedback so people buy into it earlier is really important. It’s definitely the future of where things are going.”
As visual effects studios have had to deliver higher-resolution final visual effects for TV and streaming, software providers have also had to keep up. Foundry, the makers of commonly used tools Nuke, Mari and Katana, have been adapting to 4K – and even 8K – production for some time.
“While Nuke can easily process images at higher than 8K resolution, we’ve done a lot of work to improve the artist experience and pipeline efficiency when working with these large files, notes Christy Anzelmo, Foundry’s Director of Product, Compositing and Finishing. “Recently, we’ve optimized Nuke’s handling of various EXR compression types, especially those performing over a network, resulting in faster rendering and more interactive performance in Nuke.”
Anzelmo says Nuke Studio and Hiero now have a rebuilt playback engine which is optimized for playing back EXRs that are multichannel and colored managed. “We have seen more camera footage available for compositors in post as well as compositing happening on set,” adds Anzelmo, “and have been adding support for more camera formats across the Nuke family.”
Meanwhile, Foundry’s Mari is regularly used to create textures that support 4K production, while Katana has maintained its ability to render large files. “We’re seeing an uptake of Mari,” outlines Jordan Thistlewood, Director of Product – Pre-production, LookDev & Lighting at Foundry. “It’s really all driven by the increase in resolution creating a higher demand on the requirements of what’s fed into the 3D rendering process in order to support that resolution.”
Thistlewood acknowledges that making and rendering all of this higher-resolution imagery can introduce a higher cost factor. “Katana can offset that,” he says, “through its sequence-based lighting workflows where you can work on one shot and then replicate this across subsequent shots. So people are starting to use tools and workflows like that to offset the cost of rendering because then they can make more choices upfront before they hit the final ‘make it 4K’ button.”
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