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