User manual

ARECONT VISION USER MANUAL 60

Arecont Vision 425 E Colorado St, 7

Floor Glendale, CA 91205 8/1/2012

www.arecontvision.com

An H.264 video stream is requested via RTSP using the following URL. Please note that this URL will not

work in a typical web browser. A media player such as VLC or Apple Quicktime is required for this to function

properly.

rtsp://camera_ip/h264.sdp?res=(half | full)&x0=(0..max_sensor_width)&y0=(0..

max_sensor_height)&x1=(32..max_sensor_width)&y1=(32..max_sensor_height)&qp=(4..51)&

ssn=(1..65535)&[doublescan=(0|1)]&[bitrate=(0..65536)]&[fps=1..100]

Where:

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

image by a factor of 2 in each dimension or produce the full resolution image.

 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

model and should be divisible by 32 if Res = full and 64 if Res = half.

 QP is the quantization parameter for H.264 encoder. To achieve a higher quality video, a low

needed. Recommended values are in the range (16..37);

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

image is available from the sensor (doublescan = 0) or 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).

 SSN

specifies the stream identifier. MPEG codecs including H.264 codecs are context dependent

(decoding of the current frame depends on the previous frame(s)). The stream is a sequence of

frames of the same resolution which can be decoded sequentially by one instance of an MPEG

decoder. Accordingly, SSN

is a means to distinguish different streams from one another. Use a

unique SSN

for each stream with a unique image size, quality, and/or frame rate. Each camera

supports up to eight simultaneous non-identical streams. Each client must have a unique (ip:

ssn)

 Bitrate is used to set up a constant bitrate of the H.264 stream in kilobits per second. If this parameter

is present in the request string and is larger than zero then the QP parameter is ignored and the

camera adjusts quantization parameters automatically to maintain the specified bitrate.

 FPS specifies the requested frame rate. Values 1 to 15 result in the specified frame rate. Omitting the

fps parameter or using fps values of 0 or any values above 16 will result in maximum frame rate

which is model dependent.

The camera recognizes the following RTSP methods:

OPTIONS – requesting supported RTSP methods;

DESCRIBE – requesting available resources and their format;

SETUP – resolving the camera’s and the client’s ports;