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DCS-6620G User’s Manual
D-Link Systems, Inc.
Using the DCS-6620G with an Internet Browser
Recommendations for setting video for the best performance:
“Best performance” means the image refresh rate should be the fastest possible and the video
quality should be the best possible at the lowest network bandwidth possible. Three factors,
Maximum frame rate, Fix bit rate, and Fix quality in the Video Configuration page, are related to
performance.
Recording settings for real-time motion images
To achieve a real-time visual effect, the network bandwidth should be large enough to transmit
20 image frames per second (fps) or more. If you are on a broadband network over 1Mbps,
you can set Fix bit Rate to 1000Kbps or 1200Kbps, or set Fix quality to achieve the maximum
frames. The maximum frame rate is 25 in 50Hz system and 30 in 60Hz system. If your network
bandwidth is more than 384Kbps, you can adjust Fix bit rate according to your bandwidth and
set the maximum frame rate of 25 to 30.
If the images vary dramatically in your environment, you may slow down the maximum frame
rate to 20 to decrease the transmitted data for better video quality. Since the human eye
could not easily differentiate between 20 and 25 or 30 frames per second, the slower frame
rate will not be noticed. If your network bandwidth is below 384 Kbps, you should adjust the
bit rate according to your bandwidth and experiment to allow for the best frame rate that can
be achieved. The faster frame rate in a slow network will blur the images. You may also try to
choose 352x240/352x288 in size option for better images or 704x480/704x576 for larger image
size. Because the network has burst constraints and everyone’s environment is not the same,
any poor connection will impair normal performance.
Send audio from the
active client to all the
other clients:
Improve audio quality
in low bandwidth
environment:
Audio source:
Acoustic echo
cancellation:
Bit rate:
Configuration > Advanced > Audio (continued)
In half duplex transmission mode, select the option to talk to the
server and broadcast your voice to all the other clients.
If the Network Camera works in versatile or low network bandwidth
environment, the User can check this option to improving audio
quality by sacrificing some real-time synchronization.
Select source from external or built-in microphone.
If the Network Camera works in versatile or low network bandwidth
environment, the User can check this option to improving audio
quality by sacrificing some real-time synchronization.
There are three kinds of bit-rate for audio. 32Kbps and 24Kbps
are suitable for both music and speech like audio while 8Kbps
are suitable for only speech like audio.