Live Video Interface

The video interface is located under the Video tab in the main user interface area. The Live Video panel controls the current video format, and the two HDSDI live video inputs.  To use the second HD-SDI input, HS-SDI 2 requires HD-SDI 1 to be enabled to read incoming video.

To enable live video input in Previzion, simply click the Enable button next to the corresponding input (HD-SDI 1 or HD-SDI2).


When the green light next to Enable is lit, it indicates that a video input has been detect and is ready to be used.


If no video is present at the HDSDI inputs, the green light will not go on when HD-SDI 1 is enabled, and the output frame rate will stutter.


Supported Video Formats

The HD-SDI 1 and HD-SDI 2 buttons control the 2 live HDSDI inputs to the system. When Input 1 is the main input that is sent to the keying and compositing pipeline, and must be enabled to start the live input system.


The Input Format drop down menu selects the video format and frame rate that the system expects to receive. Previzion supports most major HD input formats.  These include (as of build 7970):

  • 1920 x 1080 px – 59.94i
  • 1920 x 1080 px – 29.97 PsF
  • 1920x 1080 px – 29.97p
  • 1920 x 1080 px – 25PsF
  • 1920 x 1080 px – 25p
  • 1920 x 1080 px – 23.98 PsF
  • 1920 x 1080 px – 23.98p
  • 1280 x 720 px  – 50Hz (outputs 1920 x 1080 px – 25 PsF)
  • 1280 x 720 px – 60Hz in 24fps (outputs 1920 x 1080 px – 23.98 PsF)

If the frame rate selected does not match the incoming serial data rates, the mismatch will cause tracking problems, and will be indicated by flashing red lights in the Tracking interface.