Selecting Audio and Video Devices for Use with Polycom PVX
|
| Uses this CPU load |
This device... |
| level... |
|
|
|
Logitech QuickCam Orbit MP | Driver version 9.0.2 | Medium |
|
|
|
Veo Velocity Connect |
| Medium |
|
| |
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.
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 Load |
|
CPU Usage | 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/ |
|
| |
|
|
|
> 600 MHz | High | The device is using |
|
| as face tracking, video special effects, |
|
| 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 in progress. Determine the CPU load level as follows:
2.8 GHz x 25% = 700 MHz of CPU resources in use
Referring to the table, you see that the camera driver’s load is High.
3
