Vitek VT-IPSD102H Manual page 22

- ENCODE
 Input Format
Select input format; Composite NTSC or PAL
 Resolution
Selectable video compression resolution as below:
NTSC: 720 x 480, 720x 240, 352 x 480, 352 x 240
PAL: 720 x 576, 720 x 288, 352 x 576, 352 x 288
 Frame Rate
Select video frame rate (the maximum number of frames of video images to compress).
The frame rate transmitted can be affected by the network bandwidth limitations.
 Preference
Preference in video compression and transmission: With 'Bitrate' selected, the video
compression will be effected by the 'Bitrate' value entered. With 'Quality' selected, the video
compression will be effected by the quality of image selected. Therefore, 'Bitrate' and 'Quality'
corresponds to CBR (Constant Bitrate) and VBR (Variable Bitrate) respectively.
 Quality
VBR (Variable Bit Rate) adjusts the bit rate according to the image complexity, using up
bandwidth for increased activity in the image and less for lower activity in the monitored area.
 Bitrate
CBR (Constant Bit Rate) allows you to set a fixed target bit rate that consumes a predictable
amount of bandwidth. As the bit rate would usually need to be increased for increased image
activity (in this case it is constrained) the frame rate and image quality are affected negatively.
 I-Frame Interval
Setting numbers of P frames to each I frame between 0 and 255.
There will be no P-frame if 0 is set.
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VT-IPSD102H Manual