User's Manual

IP DVR SERVER USER MANUAL

MPEG- 4 Str ea m

Operation

Either activate or deactivate the specific stream. Primary Stream is

always active. If user is not using Secondary Stream, it’s always a good

idea to deactivate it. For example, if user is running on 320x240 Single

Resolution (only Primary Stream is active), IP DVR SERVER will perform

at 30fps; however, if running on Dual Resolution (activating both

Primary Stream and Secondary Stream), frame rate will be less than

30fps. (Please refer to MPEG-4 Frame Rate on bottom of this chart for

further explanation).

Operation will also have effects on other functions as well. For

example, if you choose to run deactivate stream in “Record” or “Event,”

that specific function won’t perform normally.

Resolution Choose size of image per stream.

Bit-rate Control

Choose between VBR (Variable Bit Rate) and CBR (Constant Bit Rate).

CBR can be set from 10kbit/s to 1800kbit/s.

GOV (Group Of Video)

Structure

Decide if image will be solely based on i-frame or mixture of i-frame

and p-frame.

GOV Length

Configure the i-frame interval. If set GOV Structure as “IP” and GOV

Length at 5, every 5

frame will be an i-frame, meaning, the output

will be “I P P P P I P P P P I P P P P …”

(If GOV Structure is set as “I,” GOV Length can only be 1.)

Frame rate

Configure the maximum frame rate per second. Depending on usage of

Secondary Stream and Resolution configuration, maximum frame rate

might differ from the set value.

In case of Single Resolution, 640x480 is maxed at 15fps and 320x240

is maxed at 30fps. However, if running a Dual Resolution, two different

streams are activated concurrently, thus, resulting in lower maximum

frame rate. For example, if running 640x480 and 320x240

simultaneously, both 640x480 and 320x240 will run at maximum value

of 10fps.

This value will also have effect on MPEG-4 image recording.

Single Resolution Dual Resolution

Primary Primary Secondary

640x480: 15fps 640x480: 10fps 320x240: 10fps

320x240: 30fps 320x240: 10fps 320x240: 5fps

320x240: 10fps 640x480: 10fps