COP-USA Digital Video Recorder, Руководство пользователя

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Chapter 7
frame consists only of the incremental changes necessary to form the next
frame, rather than an entire new frame. The greater the number of P frames
after each I frame, the more space will be saved on the hard disk, but the
more computation will be needed to uncompress the video for playback. To
use this setting:
1. click the system tab.
2. under the Others item, adjust the Number P Frames after I
Frame setting 29 is the default setting
3. click Apply , then OK to apply the change.
Figure 7-12: Number P Frames after I Frame Settings
Use of the “ Number P Frames after I Frame ” function will influence
1.the quality of the video
2.space used on the hard disk
3.the speed of data transmission
When the P frame function is set to a value higher than the default setting,
for every clip of video, less I Frames are sent, so the quality of the image will
be normal, but transmission occurs more quickly and disk space is saved;
on the contrary, when the P Frame function is set to a value lower than the
default setting, more I frames are sent, and the quality of the image will be
high, using more disk space and transmitting more slowly, so users should
set this function according to their specific requirements. Possible P Frame
setting values range from 0-60.
Enable telnetd
The “Enable telnetd” setting refers to start or stop the telnetd daemon. The
default setting allow user to login DVR system from remote site using telnet
utility (for maintenance). For security consideration, user can disable this
function as following: