HD PTZ Camera User Manual
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Multi-Stream: It means the same video source is encoded in several streams with different
resolutions. This parameter can be configured according to actual request and the setting
will be validated after reboot.
Stream Type: Configure the resolution and bitrate of main or secondary stream. The main
stream is used for HD storage and preview while the secondary or third stream is for SD
storage and preview when there is insufficient network bandwidth.
Resolution: According to the requirements of image quality by user, select resolution from
the dropdown list. The higher the resolution is, the more bandwidth it requires.
Bit Rate Type: Options include CBR and VBR, by which you can control stream rate. CBR
is fixed bit rate while VBR means the bit rate is adaptive within the upper limit. CBR
transfers stream by average bitrate with high speed compressing, but there may be
mosaic on the images; while VBR adjusts bitrate automatically with slow compressing, but
could ensure image sharpness under complex conditions.
Image Quality:
When selecting “VBR”, select image quality level from the dropdown list
according to actual requirements. The higher the level is, the clearer the image will look.
Frame Rate: Set the encoding frames per second. The higher the frame rate is, the more
bandwidth is required and the more storage it will take.
Average Bit Rate: Set the average bit rate for CBR.
Encoding Format: Select according to actual requirements, options including H.264,
H.265 and MJPEG.
Encoding Complexity: Select encoding complexity level according to actual request.
Under the same bitrate, the higher the complexity level is, the better quality the image will
have and the bandwidth it will require.
Max Key Frame Interval: Configure the interval frames between two key frames, ranging 1
~ 250. Suggest applying the default value 75. The larger the value is, the less fluctuation
of the stream there will be and the worse the image will be, vice versa.
Note:
1) When the Bit Rate
Type
is “VBR”, the parameter of Average Bit Rate will turn Bit Rate
Upper Limit and you need to configure the value manually, ranging 32 ~ 16384 (Kbps), by
default 4096.
2) The parameter of Image Quality
is enabled only when “VBR” is selected and it will remain
“Middle” when “CBR” is selected.
3) The higher the Encoding Complexity is, the more the stream will be compressed. In this
way it will relieve bandwidth restriction somehow, but meanwhile it will also occupy the
CPU resource of more devices. Suggest using the default level.
