JVC VN-V686U manual Restrictions, Jpeg File Format Sent Out by VN-V686

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

FFE0

FFFE

FFFE

FFC4

FFDB

FFDD

FFC0

FFDA

FFD9

Start Code

Application Segment

Comment Segment 1

Comment Segment 2 (reserved)

DHT Huffman Table

DQT Quantization Table

DRI Restart Interval

SOF Frame Information

Data Start Segment

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

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