User guide

Viz Engine Administrator’s Guide

DirectShow provides a set of default filters that install automatically with Microsoft®

Windows® . These filters support many data formats while providing a high degree of

hardware independence.

All the filters supported by the DirectShow Software Development Kit (SDK) are listed

on the Microsoft Developer Network (MSDN) website. If a filter appears in GraphEdit but

is not documented by the MSDN online reference, it means the filter has either been

installed by a third party or is used internally by some other Microsoft technology. Such

filters are not supported by the DirectShow SDK.

7.1.7 DirectSound Input

Microsoft DirectSound provides a system to capture sounds from input devices and play

sounds through various playback devices using advanced 3-dimensional positioning

effects, and filters for echo, distortion, reverberation, and other effects.

A DirectSound compatible card is an alternative for designers that use laptops with no

video card installed, or if analog audio is needed.

Viz supports DirectSound compatible cards that support DirectX version 8 or later.

Note: Matrox and Targa are only able to output digital audio.

Emergency Alert System

The analog audio input through the DirectSound device is also, for broadcasters in the

United States of America, reserved for the Emergency Alert System ( EAS ).

If the EAS is activated all audio will be muted and the source from the first analog audio

card installed in the system will be played through the Matrox or Targa board.

7.1.8 DirectSound Audio Card

Viz Engine 3 is able to use any DirectSound capable audio card installed in the system.

If a Matrox or Targa board is installed on the system, Viz Engine synchronizes the audio

output of the DirectSound cards to the video sync signal coming in to the video card.