47
Basic Setting > Video / Image > Video Image > GOP
GOP provides users with the function to set the pages of the I Frame and P Frame to be
transmitted in the H264 mode. Basically, the I Frame page contains the entire picture and needs
higher bandwidth, while the P Frame page only contains the parts that are different from the I
Frame and need lower bandwidth. Hence, when you need to transmit the pages without disruption
in a normal network environment, you can set up a higher GOP. For example, if GOP 15 is selected,
14 P Frame pages will follow 1 I Frame page, and so forth. However, packets may be lost when
they are transmitted in a congested network environment. In this case, the following P Frame pages
may bring about disruption of the transmission because they lose the reference upon which the
difference from the I Frame is identified. You may change GOP to 10 with this concern to avoid
disruption of the transmission. The GOP is 15 by default.
NOTE
：
Due to the stream is the RTSP streaming, the mobile phone can be receive the stream from ALS-7721. Please make
reference to the chapter of
Appendix F: Mobile Application
for different environment description.
GOP Setting
