Preview Server 5.0.0

Release Date: 2026-09-08

These are the release notes for Preview Server 5.0.0. This document describes the user-visible changes that have been made to the software since version 4.7.0.

Release Highlights

This release introduces a redesigned web interface with a modern look, a new configuration tool, and a Settings page allowing real-time changes to Preview Server’s settings.

Preview Server now uses Media Sequencer with a Viz Engine attached as a renderer host, instead of just a Viz Engine.

The following list includes notable enhancements to Preview Server:

  • Ported to .NET 8.

  • Removed caching of snapshot requests.

  • Browser is now opened to the configuration page when the installer is done.

  • Log rotation.

New Features

  • New Settings page and API (FS-689).

  • Integrated Preview Server with Media Sequencer (FS-633, FS-693).

  • It is now possible to retrieve the version of Preview Server, along with additional information (FS-670).

Improvements

  • Configuration files are consolidated into a single appsettings.json file, found in C:\ProgramData\vizrt\Preview Server\appsettings.json (FS-730, FS-731).

  • Improved logging, with the ability to change the log level at runtime, using the web interface or the REST API documented in the Settings page of the Administrator Guide (FS-685, FS-697, FS-730).

  • Log files are now rotated when they reach 200MB. Files older than 7 days are removed (FS-700).

  • Load balancing improvement (FS-635, FS-757).

  • Improved performance (FS-757).

Fixed Issues

  • Various issues reported around caching are fixed due to cache being removed (FS-633, FS-646).

  • Previous versions had erratic and unpredictable load balancing which lead to uneven distribution (FS-635).

Installation

  • The latest installer is on download.vizrt.com at /products/VizPreviewServerConnectionBroker/LatestVersion.

  • The configuration file appsettings.json is located in the ProgramData directory (default: C:\ProgramData\Vizrt\Preview Server).

Upgrading

  • It is required to uninstall any previously installed versions of Preview Server before installing 5.0.0.

  • The main testing for Preview Server 5.0.0 was conducted on Windows 10/11.

System Requirements

  • One of the following versions of Windows:

    • Windows 10 or later

    • Windows Server 2016 or later

  • MS .NET Framework 4.6.2 or later

Note: The .NET framework is only required for the installer. Preview Server is self contained, and the .NET framework is no longer required once it is installed.

Documentation

Documentation for Preview Server is available at the Vizrt Documentation Center:

  • Preview Server Administrator Guide

  • The REST API is available directly in the UI, by clicking the Frame API button, or by navigating to /doc/rest_manual.

  • The Connection Broker API documentation is also available in the UI, by clicking the Connection Broker API button, or by navigating to /doc.

Support

Support is available at the Vizrt Support Portal .