icon account icon cash icon cart icon cart icon search main arrow arrow check icon camera icon light icon audio icon computer icon storage icon discount icon facebook icon twitter icon linkedin icon vimeo icon youtube icon instagram icon google plus icon share icon email icon print icon time icon phone icon email-m icon marker-m icon pdf icon remove icon comment icon out icon-status icon-star icon-switch pie-chart line-chart icon-user icon-user-1 icon-warning expand-arrow-1 expand-arrow-2 icon-upload icon-download icon-none icon-date-scheduled icon-date-available icon-is-hazardous
Header image for article ProRes Recording with the Canon C500 & PIX240i

ProRes Recording with the Canon C500 & PIX240i

The PIX240 is a popular external recorder that offers Apple ProRes and Avid DNxHD recording codecs. An already powerful recorder, Sound Devices expanded on the capabilities earlier this year with the Aurora firmware update, adding ProRes 12-bit 4444 over 3G-SDI.

We've previously mentioned that the 4K raw capabilities of the Canon EOS C500 aren't the only differences over the C300. While the C500 can record broadcast friendly 8-bit 4:2:2 internally to the CF cards, the additional output options make the C500 extremely robust for many applications. For example, did you know that the C500 can output 12-bit 4:4:4 HD video? You might ask yourself what the big deal between 8-bit, 10-bit, or 12-bit would be, or why one would want 4:4:4 RGB, but the differences can be substantial, especially for VFX work.

In his HD formats series, Andy writes about bit depth and 8-bit versus 10-bit, but let's go over the difference between 10-bit and 12-bit. With 10-bit color you're capturing 1,024 (210) shades of color per channel. That's 1,024 shades of red, 1,024 shades of green, and 1,024 shades of blue. When you combine all the shades and their various three-color combinations together, you get a total of 1,073,741,824 possible colors (10243). When capturing 12-bit (212) you get 4,096 shades per channel for a total of 68,719,476,736 colors. So the difference between 10-bit and 12-bit? About 67 billion colors. For VFX or chroma key work, having this additional color information can be crucial.

As Andy explains in the third part of the series, chroma subsampling is a method utilized to reduce color resolution without reducing overall resolution. While this is necessary for space saving and transmission reasons, when in a VFX environment, you want the most information possible from your camera. Since the C500 can output a 4:4:4 signal, this creates smoother sampling and fewer artifacts. Think of it as if you were measuring the slope of a hill, with height measurements taken once every foot vs. once every 2 feet. The diagram of the hill drawn with 1' increments would looks smoother and with less jagged edges than the one drawn with measurements taken every 2'.

Now that we've covered the "why", let's move on to the "how". Below are the steps to set up the PIX240 with a C500 to capture 12-bit 444:

To start, connect a cable from either of the C500's 3G-SDI outputs to the 3G-SDI input on the PIX.

Next you'll want to go to the 4K/2K/MXF setup menu on the C500 and set your system priority to 2K. In your 2K output settings, choose 12-bit RGB444 as your mode and 1920 x 1080 as your resolution.

Make sure your 3G-SDI output is on and the Rec command is on, in order to send the record flag to the PIX.

On the PIX, go to the system menu and set the Rec Start/Stop to SDI Flag - Canon. Now your PIX will start and stop recording along with the C500. You'll also want to make sure the PIX is set to record ProRes 4444. Now you can record an hour and 58 minutes of 12-bit ProRes 4444 to a 256GB SSD.

Juliet McNally
Camera Technology Specialist, AbelCine LA

Related Trainings & Events


Intro image for article The Core Technology Behind Canon's Dual Pixel AF
Tech News
Recently, AbelCine organized a focus group with select cinematographers and specialists from Canon to review the new Dual Pixel Auto Focus (DAF) upgrade for the C300 camera. The consensus was that for $500, this is a feature worth many times its cost, as it expands the universe of the types of shots that can be achieved.
Intro image for article At the Bench: C500 & Odyssey7Q 4K Raw/HD Recording
Tutorials & Guides
Convergent Design's Odyssey7Q is a versatile recorder/monitor that's a perfect match for the Canon C500. The Odyssey7Q acts as a great onboard monitor and is capable of recording multiple formats from multiple cameras, but when paired with the C500, it allows for 4K Raw, 2K and HD external recording. What's especially useful with this combo is the ability to record 4K Raw externally, while at the same time recording HD internally with matched filenames.