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This document lists the advantages and disadvantages of various devices so you can choose the correct one for your environment. It also describes the factors you should consider when selecting a video input device. Once you have selected your audio and video devices, you need to configure them for optimum performance. This document describes how to use the PVX user interface to specify the audio and video device settings. If you plan on using PVX with the Computer Calling Kit for SoundStation2™ and SoundStation2W™, this document also describes how to configure the PVX settings for use with this kit. The final section of this document provides information on how to resolve audio and video issues. Choosing and Configuring Video Input Devices Polycom PVX supports a wide variety of video input devices. The quality of your PVX video largely depends on the quality and design of your video input device. These common devices have been tested with Polycom PVX version 8.0.1 or later: • AVerMedia AVerTV GO 007 FM Plus PCI • Creative WebCam Live! Motion • Creative WebCam Live! Pro • GlobalMedia iREZ KD 1394 • GlobalMedia iREZ K2 USB 2.0 • Logitech QuickCam Pro 4000 • LogiTech QuickCam for Notebooks Pro • Logitech QuickCam Pro 5000 • Logitech QuickCam Fusion • Logitech QuickCam Orbit MP • Veo Velocity Connect • V-Stream TV2800 (V-Stream Xpert DVD Maker USB 2.0) July 2006 3725-22724-003/A Selecting Audio and Video Devices for Use with Polycom PVX Determining the CPU Load for Your System Polycom PVX is a CPU-intensive application. It was originally designed to accommodate the CPU requirements of third-party video capture devices, so that the total CPU load results in acceptable performance. As modern devices have become more capable in resolution and supported features, they have sometimes also become more CPU intensive. Using some of these devices can cause the total CPU load to surpass optimal levels. For these CPU-intensive devices, you can adjust the PVX CPU requirements to accommodate the device’s requirements. The following table lists the CPU load levels for some of the video input devices supported by PVX. You will need this information to configure your device. If your input device is not listed here, refer to the information which follows this table. This device... Uses this CPU load level... AVerMedia AVerTV GO 007 FM Plus PCI Low Creative WebCam Live! Motion High Creative WebCam Live! Pro Medium GlobalMedia iREZ KD 1394 Low GlobalMedia iREZ K2 USB 2.0 Note that the GlobalMedia iREZ K2 USB 2.0 camera was tested using quality setting B (the default setting). Higher quality settings offer additional image processing capability, but the increased load on the CPU may adversely affect system performance. Medium Logitech QuickCam for Notebooks Pro P/N 961398-04030 Driver version 9.5.0 High P/N 961240-04030 Driver version 8.4.1 Medium Logitech QuickCam Pro 4000 Driver version 7.3.0 Low Driver version 8.4.8 Low Driver version 9.0.2 Medium Logitech QuickCam Pro 5000 Driver version 9.0.2 Low Logitech QuickCam Fusion Note that, as of driver version 9.0.2, the Logitech QuickCam Fusion audio echo canceller appears to add delay and introduce audible artifacts into the audio. Driver version 9.0.2 Medium Note: If the Logitech Audio Echo Canceller (AEC) is enabled, select High. Selecting Audio and Video Devices for Use with Polycom PVX This device... Uses this CPU load level... Logitech QuickCam Orbit MP Driver version 9.0.2 Medium Veo Velocity Connect Medium V-Stream TV2800 (V-Stream Xpert DVD Maker USB 2.0) Low If your device is not listed, you can calculate the CPU load level yourself. To determine your video input device’s CPU load: 1. With no other applications running, start Polycom PVX. Make sure that there is no call in progress and that you can see video. 2. Right-click an empty area in the Windows Task Bar, and choose Task Manager. 3. Click the Performance tab, and make a note of the CPU Usage, expressed as a percentage of the total CPU. 4. To determine the CPU usage in MHz, multiply the system’s CPU speed by the CPU Usage. 5. Use this table to determine the level of CPU usage: CPU Usage CPU Load Level Description < 200 MHz Low The device’s driver load is equivalent to the load for devices supported in earlier versions of PVX. For example: A webcam that captures 320 x 240 video or a PCI video capture card. 200 - 600 MHz Medium Newer devices that support VGA resolutions and higher usually compress the video. The device drivers must then decode the video before sending it to PVX, which increases the CPU load. For example: A webcam that captures 640 x 480 at 30 fps or a DV input device, such as a digital camcorder or webcam that supports Firewire/ IEEE-1394. > 600 MHz High The device is using CPU-intensive features, such as face tracking, video special effects, wide-angle lens distortion correction, or audio echo cancellation. For example, suppose your 2.8 GHz computer is running at just over 25% of the CPU with no call ...