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For opmized image contrast enhancement.
8.3 Congure Video Parameters
Video parameters would aect the live view image and recording le.
Go to System → Device Access → Device Conguraon → Device Parameter → Video Device →
Video Parameters. Select a camera, and congure parameters as your desire.
Main Stream
Main stream refers to the primary stream that aects data recorded to the hard disk drive and
will directly determine your video quality and image size. Comparing with the sub-stream, the
main stream provides a higher quality video with higher resoluon and frame rate.
Sub-Stream
Sub-stream is a second codec that runs alongside the mainstream. It allows you to reduce the
outgoing internet bandwidth without sacricing your direct recording quality. Sub-stream is
oen exclusively used by smartphone applicaons to view live video. Users with limited internet
speeds may benet most from this seng.
Resoluon
Image resoluon is a measure of how much detail a digital image can hold. The greater the
resoluon, the greater the level of detail. Resoluon can be specied as the number of pixel-
columns (width) by the number of pixel-rows (height), e.g., 1024 × 768.
Bitrate Type
The bit rate (in kbit/s or Mbit/s) is oen referred to as speed, but actually denes the number of
bits/me unit rather than distance/me unit. Two types including variable or constant are
available.
Frame Rate
It refers to the number of frames captured each second. A higher frame rate is advantageous
when there is movement in the video stream, as it maintains image quality throughout.
I-Frame Interval
I-Frame also referred as intra picture, I-Frame is the rst frame of every GOP (a video
compression technology of MPEG). It can be viewed as pictures aer compression. I-Frame
interval is the amount of frames between two connuous I-Frames.
8.4 Congure Privacy Mask
The privacy mask protects personal privacy by concealing parts of the image from live view or
recording with a masked area.
Network Video Recorder User Manual
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