Vivotek IP7251 Specifications download pdf (Page 39)

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User's Manual - 39

■ Night mode

In night mode, the Network Camera switches off (remove) the IR cut lter to allow the infrared light to

pass through� This improves the sensitivity of the Network Camera in low-light conditions�

You can click Preview to fine-tune the image, or click Restore to recall the original settings without

incorporating the changes� When completed with the settings on this page, click Save to take effect and

click Close to quit the page�

Video quality settings for stream 1 / stream 2: You can set up two seperate streams for the Network

Camera for different viewing devices. For example, set the Network Camera to a smaller frame size and

a lower bit rate for remote viewing on mobile phones. Or, set the Network Camera to a larger video size

and a higher bit rate for live viewing on web browsers�

■ Mode

The Network Camera offers two choices of video compression standards for real-time viewing: MPEG-4

and MJPEG�

If MPEG-4 is selected, it is streamed in RTSP protocol� There are four dependent parameters provided

in MPEG-4 mode for video performance adjustment�

■ Frame size

Select the video size. Note that a larger frame size takes up more bandwidth. The frame sizes are

selectable in the following resolutions: 176 x 144, 320 x 240 and 640 x 480.

■ Maximum frame rate

This limits the maximal refresh frame rate per second. Set the frame rate higher for a smoother video

quality�

If the power line frequency is set to 50Hz, the frame rates are selectable at the following rates: 1fps,

2fps, 3fps, 5fps, 8fps, 10fps, 15fps, 20fps and 25fps. If the power line frequency is set to 60Hz, the

frame rates are selectable at the following rates: 1fps, 2fps, 3fps, 5fps, 8fps, 10fps, 15fps, 20fps,

25fps and 30fps�

■ Intra frame period

Determine how often to plant an I frame� The shorter the duration, the more likely you will get a

better video quality, but at the cost of higher network bandwidth consumption� Select the intra frame

period from the following duration: 1/4 second, 1/2 second, 1 second, 2 seconds, 3 seconds and 4

seconds�

■ Video quality

A complex scene generally produces larger le size, meaning that higher bandwidth will be needed

for data transmission. Therefore, if Constant bit rate is selected, the bandwidth utilization is xed at

a selected level, resulting in mutable video quality performances� The bit rates are selectable at the

following rates: 20Kbps, 30Kbps, 40Kbps, 50Kbps, 64Kbps, 128Kbps, 256Kbps, 512Kbps, 768Kbps,

1Mbps, 2Mbps, 3Mbps and 4Mbps�

On the other hand, if Fixed quality is selected, all frames are transmitted with the same quality;

bandwidth utilization is therefore unpredictable. The video qualities are selectable at the following

settings: Medium, Standard, Good, Detailed and Excellent.

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Vivotek IP7251 Specifications Page 39