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There are VOL, Userdata1, GOV and Userdata2 before each I-VOP.
Data Structure before I-VOP
Item Note
VOL VOL of MPEG-4 Video
Userdata1
Reserved
GOV GOV of MPEG-4 Video
Userdata2
Userdata
Data Structure of Userdata2
Item Example Note
Start Code 0x000001B2 Start code of userdata in MPEG-4 Video
Product Name type = VN-V25U Product Name
Timestamp timestamp =
20070319161455123UTC
Year, Month, Day, Hour, Minute, Second,
Millisedond, and Time zone
Camera ID camera = Camera01 Camera ID that user can define
3. API to Search VN-V25/26
VN-V25/26 in LAN can be searched by broadcast packet that includes this API.
Search VN-V25/26 in LAN
Protocol Send udp packet with following text in UDP payload to destination port number 80. Source port number
can be any value.
system.id<CRLF>
Response VN-V25/26 that received this packet sends udp packet to the source port number of the search packet.
UDP payload of response packet has model name, IP address, and subnet mask. VN-V25/26 waits 0-0.7 second
before sending response to avoid too many responses are sent in short period from many VN-V25/26s.
Response Example system.id=VN-V25U(192.168.0.2/24)&200 OK<CRLF>
4. Getting Alarm from VN-V25/26
4.1. Procedure
1) The client establishes a TCP connection to port number 32040.
12
P-VOP