VIVOTEK SF8174 Manuale Utente

 

 

If 

 mode is selected, the Network Camera continuously sends 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.

The frame rates are selectable at 1fps, 2fps, 3fps, 5fps, 8fps, 10fps, and 15fps. 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 MPEG4 and 

H.264. 

► Video quality and fixed quality refers to the compression rate. If you select to enter a Customized value in 

the Fixed quality menu, a lower value will produce higher quality.

► Converting high-quality video may significantly increase the CPU loading, and you may encounter 

streaming disconnection or video loss while capturing a complicated scene. In the event of occurance, 

we suggest you customize a lower video resolution or reduce the frame rate to obtain smooth video.