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the quietly of video. When the network bandwidth is stable, you can choose constants
bit rate (called CBR for short). The third method is called CVBR, it give priority to
CBR and compatible with VBR. So you should choose control method according to
the network environment.
I frame is the key frame in video encode. In a bad network bandwidth environment, if
I frame interval is too big, the quality of the video will be poor, even can not receive
real video. In a good environment, there is no limit to set it. A good setting you can
get by previewing the setting effect.
High frame rate means more fluent video. Low frame rate may cause picture update
slow and bad interactive sense, so the suggestion setting is higher than 20.
Bit rate related to the speed of network transmission, that is to say how many kb
information it could transfer every second. Because the resolution of main stream is
times than sub stream, the date information need transferred in per second more, so
need bigger bit rate. When the resolution is 1080P, the “Bit rate” at least 6000 kbps
and when the resolution is QVGA, the “Bit rate” at least 300 kbps. The bit rate is too
small result in poor image. Do not forget to save it!
Figure3.4 Video Encode
Base profile: when device need access some manufacturers supporting embedded
NVR, you must enable base profile. But if enabled it, the video maybe with the
problem of update slowly, so, if not must, it suggested disabled.
Private date: When the video is not smooth, enable it will make this problem be
improved.
Figure 3.5 video encode advanced parameter setup
User could click the button of “default” to set all parameter as default value, only after
click “save” you can save your setting.
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3.4 Picture Capture
In this interface, “Picture Source”, “Picture Quality” and “Capture Speed” need to be
set. Of course, the default parameter is another way.
Figure 3.6 Picture Capture
Picture source include “Main Stream” and “Sub Stream”; Picture quality range from
20 to 100, you also can drag the slider; Capture speed between 1 and 2, means 1 or 2
pictures per second.
3.5 Privacy Mask
If you hope that some areas in the video to be hided you can set privacy mask area.
You can respectively configure four privacy mask areas for main stream and sub
stream. Every privacy mask area is determined by four coordinate values. The area
being privacy areas will be black screen whether in real-time stream or in record.
Figure 3.7 privacy mask setting
3.6 Media Info
In this interface, the main duty is display the status of video encodes.
