H.264 stream form the camera is sequence of I Picture and P Picture. Ratio of I Picture and P Picture depends on
Example of H.264 Stream
HTTP response
Sequence Parameter Set
Picture Parameter Set
User data
IPicture
User data
P Picture
~
User data
IPicture
There are Sequence Parameter Set, Picture Parameter Set, and User data before each I Picture and there is User data before each P Picture.
The following information is stored in the User data. Each item has a fixed length.
Item | Size | Example |
| Note |
Start code | 4 | 0x00000001 |
| Start code of User data in H.264 stream. |
NAL unit type | 1 | 0x66 |
| NAL unit type of User data in H.264 stream. |
Payload type | 1 | 0x05 |
| Payload type of User data in H.264 stream. |
User data size | 1 | 0xf0 |
| Size of User data in H.264 stream. |
Reserved | 16 | 0x030303030303030 |
| |
|
| 30303030303030303 | － | |
Model Name | 18 | type = |
| Product Name |
Time Stamp | 70 | timestamp | = | This is made up of the year/month/day, |
|
| 2012030623341253 | hour/minute/second, millisecond and timezone code. | |
|
| 8UTC |
|
|
Camera ID | 50 | camera = input01 |
| Camera ID that user can define |
Motion Detect Result | 7 | md = 1 |
| Specified as 1 if motion is detected at the time when |
|
|
|
| data is created. |
Tampering Detect | 14 | tampering = 0 |
| Specified as 1 if tampering is detected at the time when |
Result |
|
|
| data is created. |
13
