CCTV EASY SERIES H.264 Technical Information download pdf (Page 30)

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Advanced Conguration

Camera No.: The camera feed you want to alter the settings

for. These will be numbered sequentially, and correspond to

the BNC video inputs labelled on the rear of the DVR. Note

that the channel name here is independent of the Camera Name

selected on the Display: Camera menu screen.

Encoding Parameters (advanced user option): Whether

you’re editing the parameters for the mainstream or the

substream.

Main-Stream: The main-stream is the video feed that the DVR

will record and display. This is the higher-quality stream.

Sub-Stream: The sub-stream is the video stream that the DVR

will send to remote devices via a network or the Internet. It is the

lower-quality stream as a reduction in video size makes it easier

to send over a network.

Record Audio: Choose whether the channel you’ve selected

will record audio or not. If you don’t have any audio devices

connected, it’s a good idea to disable audio, as it will save

some space on your HDD.

Resolution: How many “little dots” are going to make up your

image. There’s only one option here, 960H.

If you want to alter the amount of hard drive space required

by your recordings, change the Max Bit-Rate(Kbps) setting.

As noted in “About 960H Widescreen Videos” on page 10,

a standard CCTV camera’s image will be slightly stretched

horizontally when recorded by the DVR. We recommend using

960H cameras.

However, if you do want to use an older type of camera, you

can - just be aware that the image will be slightly stretched

when displayed on the DVR.

See “About 960H Widescreen Videos” on page 10 for details

on correcting the slight stretch when playing back images on

a personal computer.

Frame Rate: The number of frames per second (fps) that the

DVR will record. The default (and maximum) is referred to as

“real-time” and is 30fps (NTSC) or 25fps (PAL).

Reducing the number of frames per second will not save

hard drive space but potentially will improve the data-rate

per frame (depending how you set the bit-rate - see the next

point).

Remember that your FPS count is the same as saying “take

X photographs per second” (where X is your FPS setting).

5fps doesn’t sound like much, but it’s still ve individual

photographs per second. If maintaining image clarity while

reducing HDD consumption is your priority, it makes sense to

lower the frame rate.

As with all settings on this screen, some experimentation is

encouraged to nd the settings which will work best for you!

Max. BitRate(Kbps): The actual amount of data that the DVR

will use to record video.

The main-stream uses a variable bitrate to record video - the

more movement occurs in the video, the higher the bitrate

will have to be. When there’s little movement in view, the DVR

will automatically reduce the bitrate to conserve HDD space.

If the amount of movement in a recording would require a

higher bitrate to accurately record than what you’ve selected

as the maximum, the DVR will attempt to preserve as much of

the quality as possible by applying compression to the image.

This compression will take the form of irregular, fuzzy blocks

over segments or the entire image. If you encounter this, it

indicates that you might need to increase the overall bitrate.

If you’ve set a high bitrate but a low frame rate, the DVR will

still use all the data it can, resulting in potentially higher

quality per frame than at higher frame rates.

The sub-stream uses a constant bit-rate. This makes the

video easier to stream over a network or the Internet.

Note: Both the main-stream and the sub-stream are always

operating - in fact, the sub-stream forms part of the main-

stream. The options will aect the output quality of each

stream, but won’t change which one is being used in dierent

circumstances.

Recording: Encode

The Recording: Encode menu allows to

alter and customize how the DVR records

footage and “encodes” the les.

“Encoding” is a term which refers to

the compression algorithm (a fancy

computer term for “make the le smaller

while retaining visual quality”) used by

the DVR.

You can choose and alter:

• the resolution (per channel),

• the frame rate (how many images

per second the DVR records), and

• the data-rate of each video stream.

The higher the data rate, the “better”

your images will look, but the more

space they’ll require on your HDD.

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CCTV EASY SERIES H.264 Technical Information Page 30

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