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Rate Control
The following H.265/H.264 bit rate modes are supported:
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CBR (Constant Bit Rate)
The video bitrate of the video stream will be fixed and consistent to maintain the bandwidth.
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VBR (Variable Bit Rate)
The video bitrate of the video stream varies according to the activity of the monitoring envir-
onment to achieve better image quality.
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LBR (Low Bit Rate)
LBR keeps low bitrate and ensures superior image quality. To implement LBR control, setup
the compression level and dynamic GOV for each streaming accordingly beforehand.
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Compression
Based on the current application area and streaming bit rate, select the most suitable
compression level, high/mid/low.
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Set High, and bit rate will vastly be reduced; however, image quality may be
degraded at the same time.
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Set Low, and bit rate will stably keep low while image quality remains high.
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Dynamic GOV
According to the amount of motion in the application area, the GOV length of the video
will be adjusted dynamically to reduce more bit rate, especially for scenes with minor
changes. The length of Dynamic GOV is from GOV Length to Max. GOV (4094).
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Select Enabled and set Max. GOV. Then click on Save to activate the setting.
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If there is small or zero activity in the scene, set Max. GOV larger, the GOV length
will be longer, resulting in lower bit rate and bandwidth.
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If there are constant dynamic changes in the scene, it is suggested just adjust
GOV Length and disable Dynamic GOV.
Click on Save to apply and store the settings.
Bit Rate
The default setting of the H.265/H.264 bit rate for Stream 1/2 is 4096 kbit/s; for Stream 3/4 is 2048
kbit/s. The setting range is from 64 to 20480 kbit/s, and the total bit rate should not exceed
26624kbit/s.
Menu Reference
The “Streaming” Tab
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