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Ratio of I-VOP and P-VOP depends on I-Frame interval setting. Encode page of Web has the setting.
First VOP can be I-VOP or P-VOP. If client want to decode from I-VOP, please skip P-VOP and wait first I-VOP.
Example of MPEG-4 Stream
HTTP response
P-VOP
P-VOP
P-VOP
VOL
I-VOP
P-VOP
~
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 Size Example Note
Start code 4 0x000001B2 Start code of User data in MPEG-4 stream.
Model Name
18 type = VN-H137
Product Name
Time Stamp
70
timestamp =
2012030623341253
8UTC
This is made up of the year/month/day,
hour/minute/second, millisecond and timezone code.
Camera ID
50 camera = input01
Camera ID that user can define
Motion Detect Result
7 md = 1
Specified as 1 if mo
tion is detected at the time when
data is created.
Tampering Detect
Result
14 tampering = 0
Specified as 1 if tampering is detected at the time when
data is created.
Pan position 16 digipan = 123 Indicates pan position in pixels from 0 to 1278.
Tilt position 17 digitilt = 123 Indicates tilt position in pixels from 0 to 958.
Zoom position 17 digizoom = 1.23 Indicates zoom value from 1.00 to 8.00.
Preset Posision
Number
15 position = 19 Indicates preset position number after
moving to
preset position
. In other cases, position = NA.