Vivotek FE8172V User Manual page 63

■ Intra frame period
Determine how often to plant an I frame. The shorter the duration, the more likely you will get better
video quality, but at the cost of higher network bandwidth consumption. Select the intra frame period
from the following durations: 1/4 second, 1/2 second, 1 second, 2 seconds, 3 seconds, and 4 seconds.
■ Video quality
A complex scene generally produces a larger file size, meaning that higher bandwidth will be needed
for data transmission. Therefore, if Constant bit rate is selected, the bandwidth utilization is fixed at
a selected level, resulting in mutable video quality performance. The bit rates are selectable at the
following rates: 20Kbps, 30Kbps, 40Kbps, 50Kbps, 64Kbps, 128Kbps, 256Kbps, 512Kbps, 768Kbps,
1Mbps, 2Mbps, 3Mbps, 4Mbps, 6Mbps, 8Mbps, 10Mbps, 12Mbps, 14Mbps, and 16Mbps. You can also
select Customize and manually enter a value.
Bit rate restriction: The bit rate configuration is characterized either by the Average or the Upper
bound approaches: the target bit rate utilized can be fluctuating around an average bit rate value or
using the bit rate value as an Upper bound threshold.
Policy: You may select Frame rate priority or Image quality priority. The firmware dynamically controls
bit rate and image quality to maintain the frame rate. If quality priority is selected, frame rate will be
slightly compromized.
On the other hand, if Fixed quality is selected, all frames are transmitted with the same quality;
bandwidth utilization is therefore unpredictable. The video quality can be adjusted to the following
settings: Medium, Standard, Good, Detailed, and Excellent. You can also select Customize and
manually enter a value.
SVC
The SVC (Scalable Video Coding) feature enables streaming of videos for multiple clients from
one single set of layered IP packets. Designed for saving bandwidth and CPU load on client
stations, the frame rate of a video stream appearing through a view cell can be individually
adjusted. This feature applies when an administrator experiences unstable video streaming due
to the lack of network bandwidth, less-than-ideal hardware, or during an occurence of network
problems.
SVC Packet
Network Camera
VIVOTEK's VAST server (rev. 1.6.1 and later) automatically negotiates with a camera and
determines whether a network camera comes with the SVC feature. The SVC checkbox appears
if the network camera supports the feature. The same checkbox also appears in the Batch Insert
Cameras window. Note that the maximum frame rate varies with different cameras.
The rest of the video configuration options in the SVC column is identical to that of the H.264
protocol.
VAST Server
LAN
LAN/WAN
VIVOTEK
30fps
Client PC
25fps
Notebook
5fps
3G Cell Phone
60fps
NVR Storage
User's Manual - 63