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User's Manual - 47
Video quality settings for stream 1 / stream 2
The Network Camera offers two choices of video compression standards for real-time viewing: MPEG-4
and MJPEG.
Click the items to display the detailed configutations. You can set up two seperate streams for the
Network Camera for different viewing devices. For example, set a smaller frame size and a lower bit rate
for remote viewing on mobile phones; or set a larger video size and a higher bit rate for live viewing on
web browsers.
If
MPEG-4 mode is selected, it is streamed in RTSP protocol. There are four dependent parameters
provided in MPEG-4 mode for video performance adjustment.
■ Frame size
Select the video size. Note that a larger frame size takes up more bandwidth. The frame sizes are
selectable in the following resolutions: 176 x 144, 352 x 240 and 640 x 480.
■ Maximum frame rate
This limits the maximal refresh frame rate per second. Set the frame rate higher for a smoother video
quality.
If the power line frequency is set to 50Hz, the frame rates are selectable at the following rates: 1fps,
2fps, 3fps, 5fps, 8fps, 10fps, 15fps, 20fps and 25fps. If the power line frequency is set to 60Hz, the
frame rates are selectable at the following rates: 1fps, 2fps, 3fps, 5fps, 8fps, 10fps, 15fps, 20fps, 25fps
and 30fps.
■ Intra frame period
Determine how often to plant an I frame. The shorter the duration, the more likely you will get a better
video quality, but at the cost of higher network bandwidth consumption. Select the intra frame period
from the following duration: 1/4 second, 1/2 second, 1 second, 2 seconds, 3 seconds and 4 seconds.
■ Video quality
A complex scene generally produces larger file size, meaning that higher bandwidth will be needed
for data transmission. Therefore, if Constant bit rate is selected, the bandwidth utilization is fixed at
a selected level, resulting in mutable video quality performances. The bit rates are selectable at the
following rates: 20Kbps, 30Kbps, 40Kbps, 50Kbps, 64Kbps, 128Kbps, 256Kbps, 512Kbps, 768Kbps,
1Mbps, 2Mbps, 3Mbps and 4Mbps.
On the other hand, if Fixed quality is selected, all frames are transmitted with the same quality;
bandwidth utilization is therefore unpredictable. The video qualities are selectable at the following
settings: Medium, Standard, Good, Detailed and Excellent.
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