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5.2.2 Video / Audio Configuration
Go to Image→Video / Audio interface as shown below. In this interface, set the resolution,
frame rate, bitrate type, video quality and so on subject to the actual network condition.
Four video streams can be adjustable.
Resolution: The size of image.
Frame rate: The higher the frame rate, the video is smoother.
Bitrate type: CBR and VBR are optional. Bitrate is related to image quality. CBR means that
no matter how much change is seen in the video scene, the compression bitrate will be kept
constant. VBR means that the compression bitrate will be adjusted according to scene
changes. For example, for scenes that do not have much movement, the bitrate will be kept at
a lower value. This can help optimize the network bandwidth usage.
Bitrate: it can be adjusted when the mode is set to CBR. The higher the bitrate, the better the
image quality will be.
Video Quality: It can be adjusted when the mode is set to VBR. The higher the image quality,
the more bitrate will be required.
I Frame interval: It determines how many frames are allowed between a “group of pictures”.
When a new scene begins in a video, until that scene ends, the entire group of frames (or
pictures) can be considered as a group of pictures. If there is not much movement in the
scene, setting the value higher than the frame rate is fine, potentially resulting in less
bandwidth usage. However, if the value is set too high, and there is a high frequency of
movement in the video, there is a risk of frame skipping.
Video Compression: Select JPEG, H264, or H265. MJPEG is not available for main stream.
If H.265 is chosen, make sure the client system is able to decode H.265. Compared to H.264,
H.265 reduces the transmission bitrate under the same resolution, frame rate and image
quality.
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