x-vnv686_response:
encode=jpeg&framerate=30&framesize=vga&ptz_info=off<CRLF><CRLF>
1.4. Restrictions
Access restriction
VN-V686 has access restriction feature that enables to deny access from a specific IP address. If JPEG is requested
from the IP address of access restriction, VN-V686 disconnects the TCP connection after API is sent.
Restriction by maximum bitrate of VN-V686
The maximum bitrate of VN-V686 is about 20 Mbps.
Number of clients
The maximum number of clients that can get JPEG stream depends on encode settings and requests from client. Refer
the instruction manual for detailed information.
1.5. JPEG File Format Sent Out by VN-V686
JPEG file from VN-V686 is JFIF compliant and consist of the following.
FFD8
Start Code
FFE0
Application Segment
FFFE
Comment Segment 1
FFFE
Comment Segment 2 (reserved)
FFC4
DHT Huffman Table
FFDB
DQT Quantization Table
FFDD
DRI Restart Interval
FFC0
SOF Frame Information
FFDA
Data Start Segment
FFD9
End Code
The following information is stored in the comment segment 1. Each item has a fixed length.
Item Size Example Note
Version Information
9 JVC V1.0
Indicates the version of information stored in the comment
segment.
File Size
18 size = 123456
Indicates JPEG size in bytes.
Width
13 width = 640
Width of JPEG.
Height
14 height = 480
Height of JPEG.
Model Name
18 type = VN-V686U
Name of model that created the JPEG.
(reserved) 12 reverse = 0 (reserved)
Time Stamp
70 Timestamp =
Indicates the time when the JPEG is created. This is made
8
