User manual

ENVI Series IP Configuration Manual
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18
 Encode
 Input Format
Choose video type to be used between composite NTSC or composite.
 Resolution
Selectable video compression resolution:
NTSC: 720X480, 720x240, 352X480, 352X240, 176X120
PAL: 720X576, 720X288, 352X576, 352X288, 176X144
 Frame rate
Determine the maximum number of frames of video images to compress. The frame rate of
transmitted video can be affected by the network bandwidth limitation.
 Preference
Preference in video compression and transmission: With „Bit rate‟ selected, the video
compression will be effected by the „Bit rate‟ value entered. With „Quality‟ selected, the video
compression will be effected by the quality of image selected. Therefore, „Bit rate‟ and „Quality‟
correspond to CBR (Constant Bit rate) and VBR (Variable Bit rate) 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.
 Bit rate
CBR (Constant Bit Rate) allows you to set a fixed target bit rate that consumes a predictable
amount of bandwidth. The bit rate would normally need to be increased for increased image
activity, but in this case it is constrained. The frame rate and image quality are affected
negatively.
 I-Frame Interval
Possible values are between 0 and 255. There will be no I-frames if 0 is selected.
 H.264 Profile
Select H.264 Profile: High Profile or Baseline Profile.
The standard defines various sets of capabilities, which are referred to as profiles, targeting
specific classes of applications.
- High Profile (HiP)