User guide

Quantizer (Minimum and Maximum):The process of safely

discarding information from a video without a significant loss in visual

quality. Using a higher quantizer value decreases video quality and

creates a smaller file size. Using a low quantizer value increases video

quality and creates a larger file size. The available range is between 2

and 31.

Note

To maintain the video frame rate, you should set the maximum quantizer

to 31. If the quality of each frame is more important, you should reduce

the quantizer value; for example, a maximum quantizer of 5 keeps a good

image quality, but skips frames when motion is high.

Intra Interval:The frequency at which a complete video frame (I-

frame) is sent by the device. The available values are in the 0 – 1000

range. Zero indicates that no I-frame will be sent automatically by the

device.

Rate Control Mode: The mode controlling the bit rate variation. The

available modes are:

Constant Bit Rate (CBR):This mode is the most effective to

maintain the target bit rate. Video quality may suffer (frames may be

skipped) and the frame rate may decrease. This mode should be used

when transmitting video over networks that have very limited

bandwidths, and with an intra interval value of 0 (default).

Constant Frame Rate (CFR):This mode maintains the target

frame rate. Video quality may suffer and the bit rate may exceed the

target value.

Quantizer Control Mode:

Standard:

High on Motion Area:

Resolution:The total number of lines (width × height) in the video

image. The greater the number of lines produces a more detailed,

clearer and sharper image, but requires more bandwidth and storage.

The following resolutions are available:

CIF: NTSC (352 × 240) and PAL (352 × 288)

2CIF: NTSC (704 × 240) and PAL (704 × 288)

4CIF: NTSC (704 × 480) and PAL (704 × 576)

D1: NTSC (720 × 486) and PAL (720 × 576)

Compression Mode:This parameter cannot be changed. The

compression mode column displays the method of encoding currently

being used on the Edge device. For the multiport devices, encoders 1 and

2 are set to H.264 and encoder 3 is set to MPEG4. For the single/dual

devices, encoders 1, 2 and 3 are set to H.264 and encoder 4 is set to

Configuring the Encoder Properties