Vivotek VS3102 - Manual (Page 49)

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The image quality of double is better than normalx2 but double will consume the most bandwidth. Once
double is chosen for video size, the “Maximum frame rate” will be limited up to 10 only.
"Modulation" The type is auto-detected during initialization, but the Administrator can still set it
manually.
VS3102 uses MPEG4 codec compression for best streaming solution. The compressed video data is far
less than JPEG in normal cases but it still depends on the level of difference between every two sequential
images. There are three dependent parameters provided for adjustment.
"Maximum Frame Rate" This limits the maximal refresh frame rate, which can be combined with the
"Video Quality Control" to optimize bandwidth utilization and video quality. If the user wants to fix the
bandwidth utilization regardless of the video quality, choose "Fix Bit Rate" and select the desired
bandwidth. The video quality may be poor due to the sending of maximal frame rate within the limited
bandwidth when images are moving rapidly. Consequently, to ensure detailed video quantization rate
regardless of the network, it will utilize more bandwidth to send the maximal frames when images change
drastically.
The option "Enable Motion Detection" will control the event of motion detection on the application page.
If this option is enabled, the preset windows framed by red lines will appear in the video window even if
no option is checked on the application page. If this option is disabled, then any settings related to motion
detection will have no effect. Motion detection will increase system load. Enter the motion detection
option page for advanced configuration.
To adjust video from external cameras, use "Flip" to map the video vertically and "Mirror" to map the
video horizontally.