Instruction manual

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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