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Userdata Information in Video Bitstream
Userdata field (supplemental information) is added to the video bitstream delivered by RTSP streaming
function. This chapter describes the data structure of Userdata field this camera supports.
Userdata Information Under H.264 Video Codec
The data structure of Userdata field where the video codec is set to H.264 is described. The format of
the data is like below, when H.264 Userdata is sent from the cameras as RTP Packet.
In the format above, the data details except RTP Header is described in the table below.
Field
Byte
Length
NAL Unit Octet
1
Payload Type
1
Size
1
UUID
16
User Data
Date Time 33
Frame
15
Rate
Time
22
Stamp
PTZ
26
Position
Tally
10
Stream
14
End Code
1
Offset
Description
0
This field is 0x06.
1
This field is 0x05.
2
This field shows the total byte length of UUID and "user data."
3
This field shows the MAC address of the camera.
19
This field shows the local time.
[example] CamTim: 2020-01-01 Wed 15:15:15\r\n
52
This field shows the current frame rate of the video bitstream.
[example] FrmRate: 60.0\r\n
67
This field shows the value which is incremented by 90kHz timer
(about 11 milliseconds per one increment).
[example] TimeStamp: 0000000001\r\n
89
This field shows the pan, tilt and zoom position.
[example] CamPos: 111ppppttttzzzzm\r\n
If a camera supports PTZ, first 3 digits are 111.
Next "pppp," "tttt" and "zzzz" show the pan, tilt and zoom position
respectively.
"m" at the bottom represents the status below.
"M" : Camera is working
"S" : Camera is paused
115
This field shows the Tally lamp status. 0: off / 1: on
[example] Tally: 0\r\n
125
This field shows the streaming status.
[example] Stream:
"IVLD"
"OFF " : Streaming not connected
"STM " : Streaming
139
This field is 0x80.
88
xxxx\r\n
: No status
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