Vivotek CC8371-HV, Руководство пользователя

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VIVOTEK
74 - User's Manual
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 resolutions 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, and 15fps, and up to 50fps. If the power line frequency is set to
60Hz, the frame rates are selectable at 1fps, 2fps, 3fps, 5fps, 8fps, 10fps, 12fps, 15fps,
and up to 30fps. You can also select Customize and manually enter a value. The frame
rate will decrease if you select a higher resolution.
■ Video quality
Refer to the previous page setting an average or upper bound threshold for controlling
the bandwidth consumed for transmitting motion jpegs. The configuration method is
identical to that for H.264.
For the Constant Bit Rate and other settings, refer to the previous page for details.
NOTE:
►
Video quality and fixed quality refer to the compression rate . A lower value produces higher
quality. The higher the compression rate, the lower the quality.
► Converting high-quality video significantly increases the CPU load, and you may encounter
streaming disconnection or video loss while capturing a complicated scene. In the event of video
loss, we suggest you customize the video stream to a lower resolution or reduce the frame rate
for a smoother video.