User manual

ARECONT VISION USER MANUAL 54

Arecont Vision 425 E Colorado St, 7

Floor Glendale, CA 91205 8/1/2012

www.arecontvision.com

HTTP Request Format for Continuous MJPEG Video Streaming

Continuous sequence of JPEG images (MJPEG) separated by the boundary separator can be requested from

Arecont Vision cameras by using the following GET method request format:

GET/mjpeg?res=resolution_value&x0=X0&y0=Y0&x1=X1&y1=Y1&quality=quality_value&doublescan

=doublescan_value&fps=value&id=value

HTTP/1.1\r\n

Host: ip_address\r\n

\r\n

where

 Res can have value of either full or half and specifies whether camera should decimate the image by

a factor of 2 in each direction or display the full resolution.

 X0, Y0, X1, Y1 are the left, top, right and bottom coordinates of the requested image window,

respectively. These values cannot exceed the size of the image sensor array for the specific camera

and should be divisible by 16 if “Res=full” and 32 if “Res=half”. These parameters allow for the video

to be cropped to a specific size.

 Quality is the compression quality of the jpeg image with the range from 1 to 20;

 Doublescan allows the user to specify whether the camera should delay the image output until a new

image is available (doublescan = 0) or if the image request should be serviced by outputting the

content of the image buffer that was already once output (useful for picture-in-picture display).

 FPS specifies the requested frame rate; values 1 to 15 result in the specified frame rate, while

omitting fps parameter as well as fps values of 0 and all values above 16 will result in maximum

frame rate that is model dependent.

The following example illustrates the request to camera with IP address 192.168.0.36 for the new full

resolution 1600x1200 video stream with compression quality 12 at a maximum frame rate:

GET /mjpeg?res=half&x0=0&y0=0&x1=1600&y1=1200&quality=12&doublescan=0 HTTP/1.1\r\n

Host: 192.168.1.11\r\n\r\n

In response to the above request the camera sends a continuous stream of images separated by the

boundary separator “fbdr” in accordance with MIME multipart/x-mixed-replace format. Please note that MIME

multipart/x-mixed-replace format is not directly supported by Internet Explorer. For video viewing based on IE

only the users should use on-camera script that can be accessed via http://ip_address/index.html request.

HTTP/1.0 200 Ok\r\n