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Chapter 6 Configuring the Sender

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] 2MBPS high quality

2 MBit/s transmission rate with high image quality

] 3.5MBPS high quality

3.5 MBit/s transmission rate with high image quality

] 5MBPS high quality

5 MBit/s transmission rate with high image quality

] 2MBPS video, 256KBPS audio

2 MBit/s transmission rate with additional audio transmission

] 4MBPS video, 256KBPS audio

3.5 MBit/s transmission rate with additional audio transmission

Data rate:

The data rate for the speed of transmission over the network is shown for each

parameter value. You can change the data rate and decide whether you prefer a

constant data rate or consistent image quality.

Selecting Constant means that the data will always be transmitted at the set rate,

but the image quality may vary. Selecting Variable means that the image quality

will be consistent, but the data rate can vary from the set value.

GOP structure:

In MPEG-2 encoding, image sequences are divided into groups (GOP – Group

of Pictures). Each GOP can contain three different frame types. I-frames contain

the complete information for an image and thus require the most coding data. P-

frames code only the difference between the current image and the previous one.

These require considerably less data. Lastly, B-frames encode only the

difference between the current image and the previous and next images. They

require the least data. However, B-frames have a large delay, because image

information from subsequent images is required for encoding. Each GOP always

begins with an I-frame.

Note

B-Frames have a large delay and are not suitable for some applications,

such as manually controlling a dome camera. Keep this in mind when

choosing a GOP structure and length.

Select the structure for the GOP. You can choose between:

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VCS VIP 1000 Guía de usuario Pagina 43