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Viz Multiplay User Guide

Version 2.3 | Published August 10, 2018 ©

Tricks and Hints

Tricks and Hints for Viz Engine 3.8.2 or later

Make sure you read and follow the recommendations in the Video Wall Configuration section of the Viz Engine Administrator’s Guide.

  • To get better performance, start viz.exe with parameter -w. In addition, set the setting create_default_renderer = 1 in the config file.

  • To see commands: “send MAIN SHOW_COMMANDS ON”.

  • If video clips and transitions flicker, send the command “RENDERER JOIN_SWAPGROUP 1”.

  • Remember that playing clips requires that all that frame rates and refresh rates match the videos - both in Clip in formats, renderer format and on the actual physical screens.

  • To see performance, send the command “RENDERER SET_PERFORMANCE 1”.

Tricks and Hints for NVIDIA Mosaic

Common Requirements

  • Turn off Aero (this is what actually introduces tearing, but it removes unaccounted visual stutters)

  • All monitors connected to the GPU must be identical models and running at identical resolutions/refresh rates. You can not have a different resolution/model 'control' monitor connected to the system without introducing tearing in at least one of the displays.

  • If possible, the monitors should be combined into a single large virtual monitor using Nvidia's Mosaic.

  • Only have one window rendering. If you are outputting to multiple monitors use a single large window that covers your entire desktop, not one window per monitor.

Quadros

  • When setting up Mosaic, be sure to not move monitors around using this dialog. Due to a driver bug this will disable the Preset you are trying to use in the next step. If your monitors are connected in reverse, change the connections manually.

  • In the Nvidia Control Panel, go to the "Manage 3D settings" page and select "Video Editing" as the profile/preset to be used.

  • Ensure the Windows taskbar is not on top of your display window.
    We have tested our system with an external blackburst sync signal, if you try to use anything else than NTSC or PAL as sync format the screen will start to flicker.

For normal 50 Hz European format use PAL.

Performance Issues

This section covers the following topics:

  • DynamicChannel scene

  • VizBoldVideo wall setup

  • Background loading of images (performance)

DynamicChannel scene

The DynamicChannel scene must be seen as a template. It must never be used in the distributed version. It must be modified by a Viz Artist expert on location to match the customer system.

This will improve performance significantly:

  • In DynamicChannel, disable or preferably remove all GFX channels not in use. (The default DynamicChannels scene has 16 GFX channels, of which eight are disabled.)
    In addition, during the playout situation:

Before going on air, "warm up" (take) all the scenes that are going to be taken. Initializing is often not enough. Scenes should be taken on air and out again at least once on their GFX channel. The next time they are taken, Viz Engine displays them without affecting the overall performance.

Always take a preset on air before the show starts. Never take presets out. There should always be a preset on air.

Video wall setup

Configuring a video wall setup is not straight forward. Make sure you read and follow this advice.

Tip:

There are many factors impacting the performance of a video wall driven by one Viz Engine, so try experimenting and fine tune the setup with real content and real constraints.

Background loading of images (performance)

Support for background loading of images was added in Multiplay 2.2.

Note:

This is unrelated to the general config setting enabling background loading in Viz Config.

This fixes a bug that froze the video wall for notable periods. This arose when a fullscreen image was added to a show and taken to air without initializing it first. While downloading the image, the Viz Engine would then block the renderer and render the image, causing the wall to freeze.

Requirements

  • Background loading of images requires the latest official Viz 3.8.3.62368 build (or later) on the official FTP.

  • The #13 version (the scene version bundled with Multiplay 2.2) of the DynamicChannels scene must be present in Graphic Hub.

    Note:

    Images froma HTTPresource (Viz One and Media Service) can still cause a small frame drop in the renderer, but at least the renderer will download it in the background and not block for a long period.

Preparation of images in GH

Images from Graphic Hub should not cause any frame drop in the renderer if they are background-loading compatible. This means they should be DXT1 or DXT5 compressed images.

To check whether a GH image is background loading compatible:

  1. Open Viz Artist, locate it in the server tree.

  2. Right-click the image and choose Check for Background Loading.
    To make a GH image background loading compatible:

  1. Open Viz Artist, locate it in the server tree.

  2. Open the image by double-clicking it.

  3. Choose Convert Format in the left menu.

  4. Choose DXT1 or DXT5 in the menu that appears.

  5. Save it.