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 =

Indicates the time when the JPEG is created. This is made

 

 

 

up of the year/month/day, hour/minute/second, millisecond

 

 

20071014130509123

and timezone code.

 

 

UTC

 

(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

9

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JVC 686U, 686BU, VN-V685U manual Jpeg File Format Sent Out by VN-V685/686/686B, Access restriction