JVC VN-H37 Manual page 16

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
VOL
Userdata1
GOV
Userdata2
Data structure of Userdata2
Item Size
Start code 4
Model Name 18
Time Stamp 70
Camera ID
50
Motion Detect Result 7
Tampering Detect 14
Result
Pan position 16
Tilt position 17
Zoom position 17
Preset Posision 15
Number
Note
VOL of MPEG-4 Video
Reserved
GOV of MPEG-4 Video
Userdata
Example Note
0x000001B2 Start code of User data in MPEG-4 stream.
type = VN-H137 Product Name
timestamp = This
hour/minute/second, millisecond and timezone code.
2012030623341253
8UTC
Camera ID that user can define
camera = input01
md = 1 Specified as 1 if motion is detected at the time when
data is created.
tampering = 0 Specified as 1 if tampering is detected at the time when
data is created.
digipan = 123 Indicates pan position in pixels from 0 to 1278.
digitilt = 123 Indicates tilt position in pixels from 0 to 958.
digizoom = 1.23 Indicates zoom value from 1.00 to 8.00.
position = 19 Indicates preset position number after moving to
preset position
is made up
. In other cases, position = NA.
1 6
of the year/month/day,