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Access restriction
VN-V685/686/686B 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-V685/686/686B disconnects the TCP connection after API is
sent.
Restriction by maximum bitrate of VN-V685/686/686B
The maximum bitrate of VN-V685/686/686B 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-V685/686/686B
JPEG file from VN-V685/686/686B 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. In VN-V686 before v1.02,
Intelligent tracking status" and "Target position of Intelligent tracking" are not available.
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-V685U
Name of model that created the JPEG.
(reserved) 12 reverse = 0 (reserved)
Time Stamp
70 Timestamp =
20071014130509123
UTC
Indicates the time when the JPEG is created. This is made
up of the year/month/day, hour/minute/second, millisecond
and timezone code.
(reserved) 13 alarm = 00000000 (reserved)
Camera ID
50 camera = input01
Stores camera information set at VN-V685/686/686B.
Motion Detect Setting
11 motion = 1
Specified as 1 when the motion detect is ON.
Motion Detect Result
7 md = 1
Specified as 1 if motion is detected at the time when JPEG