HD-SDI Setup for LiveGrade

Please note: The documentation is currently in transition from LiveGrade Pro version 3 to version 4 and may not be up to date yet.

To properly setup your HD-SDI viewing environment with LiveGrade there are some things to consider depending on your setup. The following figure shows an example of a setup with a HD-SDI signal coming from a camera going to a monitor with HD-SDI input:

 

figure 1: basic SDI setup

figure 1: basic SDI setup

 

Additionally, figure 2 shows the SDI setup needed for the recording and frame grab features in LiveGrade Pro. In this case, a second SDI cable from the camera is connected to the Blackmagic Design Ultrastudio card. This transfers the video signal over thunderbolt into LiveGrade, where you can grade the image at the same time as the LUT is loaded into the LUT Box, or record clips and framgrabs. All the settings needed for capturing an SDI signal are described in the article SDI signal recording and frame grabs.

In order to get an SDI-Out signal from LiveGrade, please follow the directions as described in the article Image View Output to HD-SDI in LiveGrade Pro.

 

figure 2:

figure 2: LiveGrade Pro SDI setup

 

If your reference monitor has both SDI and DVI/HDMI inputs, the live video image can be sent via DVI or HDMI to it as an external secondary monitor. It’s possible to attach both signals and switch between them when creating your grades and recording the live image. In order to match LiveGrade’s Image View with a broadcast-video display, you may want to disable ColorSync and use video gamma for the Image View. See Matching LiveGrade’s Image View with a broadcast-video display for further details

 

Legal and Extended SDI Settings

 

LiveGrade SDI Setup

figure 2: SDI setup for Legal/Extended settings

 

The orange “Legal or Extended” labels indicate that cameras and monitors can be configured with different settings for HD-SDI input/output:

  • Legal Range: Code values for luminance range from 64 to 960 in a 10bit (0…1023) signal. This is the common setup and usually the default setting for HD-SDI signals.
  • Extended Range: Code values for luminance range from 0 to 1023 in a 10bit (0…1023) signal. This is a special setting useful for certain workflows.

HD-SDI signal sources and destinations can usually be configure to output / expect legal or extended range code values.

 

 

HD-SDI output configuration in the ARRI Alexa menu structure

Figure 2: HD-SDI output configuration in the ARRI Alexa menu structure

 

 

Depending on these settings LiveGrade has to be configured accordingly to handle incoming and outgoing signals. You can set the Legal / Extended range settings for each attached device in the Device Manager screen.

 

Figure 3: Device Manager

Figure 3: HD-SDI setup in LiveGrade’s device manager

 

If the code value ranges of signal source (e.g. camera) and signal destination (e.g. HD-SDI monitor) don’t match, you can even use Pomfort LiveGrade to convert one code value range into another. For example to convert an Extended range signal coming from a camera to a Legal range signal for a HD-SDI monitor, set the HD-SDI settings as follows:

 

Figure 4: Converting code value ranges from Extended to Legal with Pomfort LiveGrade

Figure 4: Converting code value ranges from Extended to Legal

 

Important Note for Blackmagic HDLink Users: 

To see the color transformations made by LiveGrade on SDI-Out, please make sure, that the “Send to all video outputs” checkbox is set in the BlackMagic HDLink Utility (the software comes with the devices). Without this checkbox checked HDLink will only display modified colors on the DisplayPort, DVI, and HDMI ports.

Figure 5: Setting up the SDI-Out of HDLink for color transformations from LiveGrade

Figure 5: Setting up the SDI-Out of HDLink for color transformations from LiveGrade

 

For more information about compatible HDLink devices, see Supported HDLink models.