Polycom PVX Release Note page 29

system field, and then you press Reset to restore the system defaults, the
camera driver load setting does not change back to Medium. Since this
setting is machine-dependent, it does not get automatically restored.
If you have a new Logitech camera, such as the QuickCam 5000 Pro, Orbit MP,
QuickCam Fusion, or a new QuickCam for Notebooks Pro, the local video may
become choppy or may freeze if you enable Enable VGA 30 frames per second
on the Setup > Video > Advanced page. For most cameras, you should not enable
this setting. For important information about how to set this and other settings
to achieve optimum video quality, refer to the Selecting Audio and Video Devices
for Use with Polycom PVX document, available at
http://www.polycom.com/common/pw_item_show_doc/1,1276,4556,00.pdf.
Polycom has qualified the cameras listed in the Selecting Audio and Video Devices
for Use with Polycom PVX document (available at
http://www.polycom.com/common/pw_item_show_doc/1,1276,4556,00.pdf)
for use with Polycom PVX software. Many other cameras with Microsoft WDM
video capture support will also work, although some are not fully compatible or
place their own demands on the CPU that prevent them from being included on
the list. Polycom continues to evaluate cameras and will add them as
appropriate.
• Very high CPU usage can be seen in a number of situations:
— On systems with less than a 2.0 GHz Pentium 4 or equivalent, the
software is very busy with media processing with only a modest amount
left for other applications. Changing the resource allocation under the
Setup > General > Performance page to favor Other Applications can
reduce the load for video processing.
— On systems with some video capture devices, including some USB 2.0
cameras, the camera driver can use a high percentage of the CPU to do
video capture. If you see the CPU load above 40% while previewing
local video when not in a call, this can be the cause. Changing the system
resource allocation to favor Other Applications under the Setup >
General > Performance page can help with this somewhat. Please verify
that you have the latest video capture drivers for your device.
— When sending the desktop to the far site, you should see the CPU at or
above 95%. This is expected since the desktop capture and encoder are
busy running to provide the best desktop video quality. This code is
running at a lower priority than normal applications, which ensures that
those applications run first, but that desktop video uses all remaining
CPU resources.
For important information about how to manage CPU resources to achieve
optimum video quality, refer to the Selecting Audio and Video Devices for Use with
Polycom PVX document, available at
http://www.polycom.com/common/pw_item_show_doc/1,1276,4556,00.pdf.
• If you experience no video or audio in a call, please verify that the latest
hardware drivers are installed and check the video or audio with the
vendor's software to verify that the operating system can handle the device
properly. This can make a significant difference in media performance.
Release Notes
Polycom PVX Version 8.0.2
29