Why does the Genex multiplexer display lossy video

Issue

When video is displayed on a 4, 9, or 16 multipane video screen; the video doesn’t flow with live motion but clips and jumps scenes.

Product Line

Pelco Cameras

Environment

Genex Multiplexer – all models

Cause

The Genex uses a technology called multiplexing (time division multiplexing)to display multiple video feeds simultaneously. An analog video channel is sampled and digitally converted. Then the total number of video signals displayed is divided into an arbitrary number of variable frame rates based upon the multiview selected.

The Genex multiplex circuit squeezes down video clip sizes by reducing the video's frame rate. The higher the frame rate, the smoother the motion: The standard frame rate for full-motion video is 24 to 30 frames per second (fps). At this speed, the human eye perceives movement as continuous—a phenomenon known as persistence of vision. A common rate for streaming video that approximates full-motion video is 15 fps. To most people, 15 fps video flows smoothly, though not quite as fluidly as one at a higher rate.

  • Below 15 fps, a video looks jerky. 
  • Below 7 fps, a video looks very jerky. 
  • Below 3 fps, a video essentially becomes a slideshow. 

Resolution

This is a product feature that cannot be adjusted or configured for live motion video rates. Live motion video will display ONLY in a single view video window pane.