Item
Description
Quality
Constant
quality mode
only
Reflects the amount of compression. Generally
speaking: the higher the quality setting, the lower
the compression ratio and the more bits are
consumed. This means a trade-off has to be found
between the desired quality level and available
bandwidth.
Profile
Preset combinations of settings for specific purposes. When a profile
has been selected, changing one of its defined parameters sets the
Profile box to '--', to indicate that a custom profile has been
configured. When a freely chosen parameter value combination
matches a preset profile, the name of the profile shows in the Profile
box.
Show Preview>>
Click to view live images and see the effect of the current settings.
<<Hide Preview
Closes the preview. This may improve webpage responsiveness.
Volume
Move the slider to control audio volume.
Mute
Select/clear this box to mute/unmute audio.
11.3.1.1
Parameter value combinations
Set sensible combinations of video bit rate mode, resolution, GOP length, and frame and bit
rates. When you set and save these values, inappropriate value combinations are 'corrected'
by automatic selection of the closest suitable combination.
Important: If in doubt about the effects of specific encoder settings, you are advised to
select the profile offering the closest match to your required application.
11.3.2
Constant Quality Mode configuration
Constant Quality mode (CQM) can be used in situations with intermittent increases of
movement in camera images. This mode provides better pictures when quickly panning a PTZ
camera, for example. TKH Security recommends the following strategy for Constant Quality
mode configuration.
To configure CQM settings
1
In Encoder Settings, open the Video bit rate mode list, and then select Constant
quality.
2
With the video source connected and the encoder enabled, go to the Quality field and set
the desired quality (range: [0 ... 100%]), aided by the visual feedback in the Preview.
3
Press Save to store your settings.
The Actual bit rate field is dynamically updated with the current bit rate.
4
Determine if the average bit rate used with the current Quality setting is acceptable. If
not, modify the Quality setting.
5
To set the upper limit for the bit rate, open the Advanced Settings section and use the
CQM max bit rate field to specify the maximum bit rate.
Generally, it is not necessary to change the default setting of 6000 kbit/s, unless there
are physical limitations on the network.
6
Press Save to store your settings.
Video
48
