VIVOTEK
74 - User's Manual
Video quality settings for multiple streams
Advanced Mode
The Network Camera offers three choices of video compression standards for real-time viewing: MPEG-
4, H.264, and MJPEG.
Click the items to display the detailed configuration settings. You can set up three 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.
If
MPEG-4
mode is selected, it is streamed in 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: 1280 x 800, 1280 x 720, 640 x 400, 320 x 200, and 176 x 144.
■ Maximum frame rate
This limits the maximal refresh frame rate per second. Set the frame rate higher for a smoother video
quality. 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, 4Mbps, 6Mbps, and 8Mbps. You can also select
Customize
and manually
enter a value.
