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Fine-tuning for Optimum Performance
Optimum performance of the DDK-3000 Video Encoder generally equates to having a high frame rate,
high-resolution video image at the lowest possible network bandwidth. The three factors, “Maximum
frame rate,” “Fix bit rate,” and “Fix quality,” on the Video Configuration page, should be adjusted to
achieve the best possible performance based on the available bandwidth.
For Best Real-time Video Images
To achieve optimum real-time video, the available network bandwidth should be capable of transmitting a
minimum of 20 image frames per second. If a broadband network is available, transmission rates will
normally exceed 1 Mbps. In this environment, set the “Fix bit rate” to 1000Kbps or 1200Kbps, and set
“Fix quality” at the highest quality. The maximum frame rate is 25 fps in a PAL system and 30 fps in an
NTSC system.
For instance, if network bandwidth is limited to 384 Kbps, you can fix the bit rate at a lower setting and
set the maximum frame rate to 25 fps or 30 fps. If the video images are inconsistent, you may want to
slow the maximum frame rate down to 20 fps in order to lower the rate of data transmission. This will
produce better video quality. If your network bandwidth is below 384 Kbps, set the “Fix bit rate”
according to your bandwidth and try to get the best performance by fine-tuning the “Maximum frame
rate.”
On a slow network, choosing a higher frame rate will decrease the video quality. It is therefore important
to test a combination of settings to achieve the best overall video quality. Another way to improve the
video image quality is to select “Half” in the “Size” option, which will reduce the screen size. Video
quality will also be impacted by the number of users simultaneously connected to the encoder, even when
the parameters have initially been finely tuned.
Summary of Contents for DDK3000
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