Vivotek IP8152 User Manual download pdf (Page 56)

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56 - User's Manual

If JPEG mode is selected, the Network Camera sends consecutive JPEG images to the client,

producing a moving effect similar to a lmstrip. Every single JPEG image transmitted guarantees

the same image quality, which in turn comes at the expense of variable bandwidth usage� Because

the media contents are a combination of JPEG images, no audio data is transmitted to the client�

There are three parameters provided in MJPEG mode to control the video performance:

■ Frame size

You can set up different video resolution 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� Note that a larger frame size takes up more

bandwidth�

■ 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� The frame rate will decrease if you select a higher

resolution�

■ Video quality

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�

• Constant bit rate: A complex scene generally produces a larger le 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 rmware 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�

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Vivotek IP8152 User Manual Page 56