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4.2.2 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.
Three video streams can be adjustable.
Resolution: The size of image.
Frame rate: The higher the frame rate, the smoother the video is.
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 bitrate type is set to CBR. The higher the bitrate, the
better the image quality will be.
Video Quality: It can be adjusted when the bitrate type 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: MJPEG, H264+, H264, H265 or H265+ are applicable. MJPEG is not
available for main stream. If H.265 / H.265+is chosen, make sure the client system is able to
decode H.265 / H.265+. Compared to H.265, H.265+ saves more storage space with the
same maximum bitrate in most scenes. Compared to H.264, H.265 reduces the transmission
bitrate under the same resolution, frame rate and image quality.
Note: For plug-in free live view, MJPEG is not recommended (if the sub / third stream and
MJPEG are selected, no image will be output).
Profile: For H.264. Baseline, main and high profiles are selectable.
Send Snapshot: Set the snapshot stream.
Video encode slice split: If this function is enabled, smooth image can be gotten even
though using the low-performance PC.
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