Additional Conferencing Information
Polycom®, Inc. 157
Only one preview window can be displayed for a single conference and up to four preview windows
can be displayed for each system.
Live video that is shown in the preview window does not include the Content when it is sent by the
participant.
Video Preview is supported in cascaded conferences.
If the video preview window is opened when the IVR slide is displayed to the participant, it will also
be displayed in the video preview window.
Video Preview is supported with H.264 High Profile.
Video Preview is not supported for endpoints using the RTV protocol.
Video Preview is disabled in encrypted conferences.
Video preview cannot be displayed when the participant’s video is suspended.
Participant’s video preview and the Polycom Desktop application (such as CMAD) window cannot be
open and running simultaneously on the same PC as both require the same DirectDraw resource.
Workstation Requirements to Display Video Preview
To be able to display the video preview window, the following minimum requirements must be met:
Windows XP, Windows Vista and Windows 7
Internet Explorer 7 and later
DirectX is installed
DirectDraw Acceleration must be enabled and no other application is using the video resource
Hardware acceleration must be enabled

Testing your Workstation

To ensure that your workstation can display the video preview window:

1In Windows, click Start > Run.
The Run dialog box opens.
2In the Open field, type dxdiag and press the Enter key or click OK.
A confirmation message is displayed.
3Click Yes to run the diagnostics.
The DirectX Diagnostic Tool dialog box opens.
4Click the Display tab.
To be able to display the video preview window, the DirectDraw Acceleration and Direct3D
Acceleration options must be Enabled.