Vivotek IP7153 User Manual page 57

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 configuration settings. You can set up two seperate streams for the
Network Camera for different viewing devices. For example, set a smaller frame size and lower bit rate
for remote viewing on mobile phones and a larger video size and a higher bit rate for live viewing on web
browsers�
MPEG-4
If mode is selected, the video is streamed via RTSP protocol� There are four parameters
provided in MPEG-4 mode which allow you to adjust the video performance:
■ 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, 320 x 240, and 640 x 480.
■ Maximum frame rate
This limits the maximum refresh frame rate per second. Set the frame rate higher for smoother video
quality�
If the power line frequency is set to 50Hz, the frame rates are selectable at 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 1fps, 2fps, 3fps, 5fps, 8fps, 10fps, 15fps, 20fps, 25fps, and 30fps� You can also select
Customize and manually enter a value�
■ Intra frame period
Determine how often to plant an I frame� The shorter the duration, the more likely you will get better
video quality, but at the cost of higher network bandwidth consumption� Select the intra frame period
from the following durations: 1/4 second, 1/2 second, 1 second, 2 seconds, 3 seconds, and 4 seconds�
■ Video quality
A complex scene generally produces a 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 performance� The bit rates are selectable at the
following rates: 20Kbps, 30Kbps, 40Kbps, 50Kbps, 64Kbps, 128Kbps, 256Kbps, 512Kbps, 768Kbps,
1Mbps, 2Mbps, 3Mbps, and 4Mbps� You can also select Customize and manually enter a value�
On the other hand, if Fixed quality is selected, all frames are transmitted with the same quality;
bandwidth utilization is therefore unpredictable� The video quality can be adjusted to the following
settings: Medium, Standard, Good, Detailed, and Excellent. You can also select Customize and
manually enter a value�
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