Vivotek IP8152 User Manual page 56

VIVOTEK
If JPEG mode is selected, the Network Camera sends consecutive JPEG images to the client,
producing a moving effect similar to a filmstrip. Every single JPEG image transmitted guarantees
the same image quality, which in turn comes at the expense of variable bandwidth usage� Because
the media contents are a combination of JPEG images, no audio data is transmitted to the client�
There are three parameters provided in MJPEG mode to control the video performance:
■ Frame size
You can set up different video resolution 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� Note that a larger frame size takes up more
bandwidth�
■ 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� The frame rate will decrease if you select a higher
resolution�
■ Video quality
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�
• Constant bit rate: A complex scene generally produces a larger file size, meaning that
higher bandwidth will be needed for data transmission� To regulate the bandwidth
consumption and storage space for recording videos, you can select the Constant bit
rate methodology. The firmware will try its best to contain the size of video packets
within the limitation of a constant bit rate� This methodoloy enables easier calculation
of the network bandwidth and storage space required for live viewing or video
recording�
Policy:
- Frame rate priority - Firmware will try to maintain the target frame rate per second,
while the image quality will more or less be compromised�
- Image quality priority - Firmware will try to maintain the quality of the video while the
frame rate (no� of frames per second) may decrease�
56 - User's Manual