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Vivotek IP7133 (WIRED) User Manual

Page 39

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User's Manual - 39

If

MPEG-4

mode 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, 352 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 file size, meaning that higher bandwidth will be needed

for data transmission. Therefore, if Constant bit rate is selected, the bandwidth utilization is fixed 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, 1�5Mbps, 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�

If

JPEG

mode is selected, the Network Camera continuously sends JPEG images to the clients,

producing dynamic effects similar to movies� Every single JPEG image transmitted guarantees the

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

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

■ 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, 352 x 240, and 640 x 480�