VIVOTEK
60 - User's Manual
The frame rate will decrease if you select a higher resolution�
■ Intra frame period
Determine how often for firmware 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
Constant bit rate:
•
Constant bit rate
: A complex scene generally produces a larger file size, meaning that
higher bandwidth will be needed for data transmission. The bandwidth utilization is
configurable to match 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,
and 8Mbps
� You can also select
Customize
and manually enter a value�
- Target bit rate
: select a bit rate from the pull-down menu. The bit rate ranges from
20kbps to a maximum of 20Mbps� The bit rate then becomes the Average or Upper
bound bit rate number� The Network Camera will strive to deliver video streams
around or within the bit rate limitation you impose�
- Policy:
If Frame Rate Priority is selected, the Network Camera will try to maintain
the frame rate per second performance, while image quality will be compromised� If
Image quality priority is selected, the Network Camera may drop some video frames
in order to maintain image quality�
• Fixed quality:
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�
- Maximum bit rate:
With the guaranteed image quality, you might still want to place
a bit rate limitation to control the size of video streams for bandwidth and storage
concerns� The configurable bit rate starts from 1Mbps to 40Mbps� In low light
conditions, lot of noises can be generated and the frame sizes can significantly
increase. Placing a bit rate limitation can limit the size of frames.
You may also manually enter a bit rate number by selecting the
Customized
option�
