Though the adoption timeline is debated, 4K is clearly the future
(high-resolution pun intended). In the next few years we’re going to see
more high-end editorial shops and post facilities adopt 4K workflows to
remain competitive in their markets. As the industry embraces the
format, there are still a number of hurdles to overcome with regard to
the production chain, primarily acquisition and drive bottlenecks.
Jeff Preston shoots at Bowers Beach, Del.
The editorial part of the chain already works. All the current versions of the major NLEs (Adobe, Apple and Avid.)
handle 4K directly in some way. Even though Avid Media Composer can’t
output 4K at this time, there are strong workflows that permit a full 4K
output with Blackmagic Design DaVinci Resolve.
Delivery and display pose challenges. If your client wants to see an
HD master in 4K today, it can be difficult and it’s going to be a
challenge to deliver. How is your client going to evaluate a 4K H.264
file? And what about you? Right now, it’s likely that you don’t have a
calibrated 4K monitor—and your clients certainly don’t (although the
native display of a MacBook Pro with Retina display comes close).
Monitoring in HD on a calibrated system is a similar compromise that
resembles the HD/SD monitoring before HD monitoring was affordable. Of
course, checking the focus at 100 percent is vital.
But I want to emphasize the front of the chain: acquisition. We’re
talking about large data acquisition. While I love raw workflows,
primarily for the flexibility they offer in color grading, most often
they’re cumbersome for data piping and storage. That’s where technology
developers like AJA are stepping in with cost-effective solutions
engineered to simplify 4K workflows.
Of course, these images look much better in post on calibrated monitors—even in HD.
The Ki Pro Quad
in particular makes 4K acquisition a manageable endeavor. I recently
experienced this firsthand while preparing footage for an Inter BEE
presentation for Canon and G-Technology on the topic of maximizing
performance for 4K workflows.
For the project, my good friend and veteran DP Jeff Preston
(DP/producer/editor at Visual Innovations) and I designed and
implemented a 4K workflow based on AJA’s Ki Pro Quad. Our aim was to
capture the highest-quality footage possible (we used a Canon EOS C500) and push it through every one of the NLEs I use—Apple Final Cut Pro X, Avid Media Composer 7 and Adobe Premiere Pro CC, as well as a few common compositing and finishing tools—to see how the footage and the software would perform together.
AJA Ki Pro Quad connections
One of the first decisions to make was whether to capture raw and,
knowing how unwieldy it could be, how much of it. I also needed to
design a less demanding workflow than pure raw, which is how I arrived
at using the ProRes 4444 codec. It would give me “almost” full raw
quality, so I’d have the flexibility to see how far I could push the
footage in color grading. The Ki Pro Quad and Canon EOS C500 were a
natural fit for this project. With them, we’d be able to record any
flavor of ProRes, and also gather a few raw shots as test footage.
With our C500 and Quad in hand, Jeff and I began the test. We shot
footage in three different locations for variety: a farm by the side of a
road, a beach at sunrise and a state park. (We actually recorded some
footage of my daughter, just so I could say I was the first person to
shoot a home movie in 4K.) In each environment, we connected the Quad to
the C500 with a single 3G-SDI cable. It mounted beautifully behind the
camera. The Quad was able to debayer the camera’s raw footage while simultaneously encoding it into a log ProRes file, preserving as much dynamic range as possible for the compressed file format.
Ki Pro Quad 4K workflow with raw camera data
It’s rare in this business that you unpack a piece of hardware, plug
it into another device and it just works. Usually adjustments need to be
made or troubleshooting is involved, but with Quad, I plugged it in,
hit record and I was capturing 4K ProRes 4444 footage. The default
settings were ideal, and the C500 auto-trigger features built into the
Quad were spot-on.
The Quad’s design made it easy to get up and running. Once you’re
recording, the confidence monitor on the device gives a quick reference
of the input signal, along with access to all operating menus. The
HD-SDI and HDMI outputs permit the user to monitor at 4K and HD
resolutions simultaneously, so we could ensure the quality of our
footage throughout filming.
I was impressed by the Quad throughout the shoot, even when it came
time for the gutsiest part: capturing 4K raw footage. I had installed
AJA’s CamXchange software on my MacBook Pro prior to our shoot. To
record uncompressed raw footage directly to my laptop, all we had to do
once we were on set was plug the Thunderbolt cable from the Quad into my
MacBook and fire up the software. It was almost unbelievable that we
could look at uncompressed footage like that. It’s not every day that
you get to play with raw material. For most workflows, you will want to
attach a RAID or other appropriate storage to your CPU for best
performance with the resultant uncompressed DPX files, especially on
We never did try plugging in the audio.
The Ki Pro Quad took the uncompressed raw data coming across the SDI
output from our C500 and transferred it over Thunderbolt to my laptop in
real time. On top of that, all of the raw files created by the
CamXchange application on my computer mirrored my ProRes QuickTime file
names, meaning they’d be ideal for proxies. I couldn’t believe it; I’d
expected the process to be five times more complex. If I were going to
create a raw/proxy workflow, I’d use a less demanding version of ProRes,
such as ProRes 422, just for the lower data rate.
By the end of the shoot we’d acquired 30 minutes of ProRes 4444,
which took up close to 350 GB on our AJA Pak media (an SSD that slides
into one of two slots in the Quad), and raw footage captured to the
laptop. Once filming wrapped, I plugged the AJA Pak Dock SSD media
reader into my MacBook via Thunderbolt, removed the Pak drive from the
Quad and inserted the drive into the Dock. I was then ready to test in
Apple Final Cut Pro X, Adobe Premiere Pro CC and Avid Media Composer 7,
along with Adobe SpeedGrade and Blackmagic DaVinci Resolve.
When capturing raw, CamXchange matched the raw files to the QuickTime media, making a proxy workflow easy.
This 4K workflow wouldn’t have been possible without Ki Pro Quad.
While the EOS C500 camera shoots in 4K, it captures only to HD without
external hardware, and it’s pretty compressed. To capture 4K with the
C500, you need to come off of its camera port using an external
recorder. The Ki Pro Quad’s specs made it my go-to choice. It’s evident
that AJA engineered the recorder to meet the needs of users in
real-world production scenarios. I simply plugged a single cable into my C500 and it worked the first time, right out of the box. As a post pro, you can’t really ask for more than that.
The Ki Pro Quad is a piece of quality hardware that made my 4K
production experience an enjoyable one. If image quality is important,
then you can see why you’d want to work with a pure 4K signal. The
device effortlessly recorded into ProRes, and performed admirably on the
extra-special shots that required true raw. For those choosing the 4K
path, Ki Pro Quad works like a champ.
Jeff Greenberg is a postproduction consultant and master
instructor for Adobe, Apple and Avid, with nearly two decades of
experience in editorial, compositing, sound, color grading and
compression. He’s the chair of the Editor’s Retreat, a yearly getaway for editors by editors.