VIVOTEK
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: Target bit rate:
A complex scene generally produces a larger file size, meaning that higher bandwidth will be needed for data transmission. To regulate the bandwidth consumption and storage space for recording videos, you can select the Constant bit rate methodology.
The firmware will try its best to contain the size of video packets within the limitation of a constant bit rate. This methodoloy enables easier calculation of the network bandwidth and storage space required for live viewing or video recording.
Policy:
-Frame rate priority - Firmware will try to maintain the target frame rate per second, while the image quality will more or less be compromised.
-Image quality priority - Firmware will try to maintain the quality of the video while the frame rate (no. of frames per second) may decrease.
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.
•Fixed quality: On the other hand, if Fixed quality is selected, all frames are transmitted with the same quality; bandwidth utilization is therefore unpredictable.
When so configured, the
You can also select Customize and enter a number to designate image quality. The larger the number, the higher the compression rate, and hence image quality is lower. A small customized quality number means a low compression rate, and a high quality image.
-Maximum bit rate - While you want to ensure a reasonable image quality, you can still impose an upper threshold on the bandwidth taken for the video transmission.
The configurable bit rate ranges from 1mbps to 40mbps.
User's Manual - 55
