Moxa VPORT 254-M-SC-T Manual do Utilizador descarregar pdf (Página 73)

VPort 254 User’s Manual System Configuration

4-29

Max. FPS (Frame per second)

Setting Description Default

Maximum frame rate

The maximum frame rate is different to

accommodate different modulations of

video input. Administrators can also set

up the maximum frame rate to optimize

the bandwidth’s occupation.

Frame Mode:

30 for NTSC, 25 for PAL

Resolution Mode:

7 for NTSC or 6 for PAL

Key frame interval

(Only for MPEG4)

Administrators can set up the key frame

interval to determine the video quality.

NOTE

Frame rate (frames per second) is determined by the resolution, image data size (bit rate), and

transmission traffic status. The Administrator and users can check the frame rate status in the

FPS Status on VPort’s web homepage.

NOTE

A large “Key frame interval” can reduce the bit rate, but will cause the image to be corrupted

longer if there is packet loss during transmission.

Video Quality Control

Video Quality Control is used to optimize the bandwidth of the MPEG4 video stream. There are 2

modes for video quality control.

Setting Description Default

Fixed bit rate

(Only for MPEG4)

The administrator can fix the bandwidth to tune

the video quality and FPS (frames per second) to

the optimum combination.

Different resolutions have different bandwidth

parameters. The VPort will tune the video

performance according to the bandwidth. A higher

bandwidth means better quality and higher FPS.

144 Kbps in CIF

resolution

Fixed Quality

The administrator can set the image quality to

one of 5 standards: Medium, Standard, Good,

Detailed, or Excellent. The VPort will tune the

bandwidth and FPS automatically to the optimum

combination.

Good

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