Vivotek IP7153 Specifications download pdf (Page 57)

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User's Manual - 57

Video quality settings for stream 1 / stream 2

Advanced Mode

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

and MJPEG�

Click the items to display the detailed conguration settings. You can set up two seperate streams for the

Network Camera for different viewing devices. For example, set a smaller frame size and lower bit rate

for remote viewing on mobile phones and a larger video size and a higher bit rate for live viewing on web

browsers�

If MPEG-4 mode is selected, the video is streamed via RTSP protocol� There are four parameters

provided in MPEG-4 mode which allow you to adjust the video performance:

■ 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 maximum refresh frame rate per second. Set the frame rate higher for smoother video

quality�

If the power line frequency is set to 50Hz, the frame rates are selectable at 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 1fps, 2fps, 3fps, 5fps, 8fps, 10fps, 15fps, 20fps, 25fps, and 30fps� You can also select

Customize and manually enter a value�

■ 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

A complex scene generally produces a 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 performance� The bit rates are selectable at the

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

1Mbps, 2Mbps, 3Mbps, and 4Mbps� You can also select Customize and manually enter a value�

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�

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Vivotek IP7153 Specifications Page 57