VIVOTEK
User's Manual - 51
The frame rate will decrease if you select a higher resolution�
■ 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
Constant bit rate:
• Bit rate restriction: You can select either the Average or Upper bound method as a
limiting factor� The Average method allows the bit rate consumed to uctuate around
the target bit rate, e�g�, slightly higher or lower than 6Mbps� The Average method can
apply when regulating the storage space taken when recording a video feed� The
Upper bound method places a limitation on the maximum bit rate, and can be used
to regulate the network bandwidth taken by a video stream�
• Target bit rate: A complex scene generally produces a larger le 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, 8Mbps, 10Mbps, 12Mbps, 14Mbps, and 16Mbps� You can
also select Customize and manually enter a value�
• Policy: When bandwidth and storage space become an issue, there will always
be a compromise between image quality and frame rate per second� It is users’
responsibility for an adequate bandwidth planning before they deploy network
cameras� The policy here helps users with the initial network planning�
1� Frame rate priority - The camera will try to deliver a video stream with an optimal
frame rate, e�g�, 30fps, while image quality can be compromised� For example,
users may prefer frame rate over quality where dropped frames are not preferred
such as monitoring the consecutive actions in a manufacturing facility�
2� Image quality priority - The camera will try to deliver images in its highest quality
while the number of frames per second can be compromised�