ACTi ENR-2000 Series Manual de usuario descargar pdf (Pagina 10)

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ENR-2000 Series User’s Manual

Display Video Performance

On a Live or Playback screen, ENR handles displayed video differently based on the

combination of the following factors, which you should put into consideration when

configuring your view layout:

(1) The number of channels of your current layout

(2) The format of video stream, e.g. resolution and frame rate.

To balance the loading of the system, ENR will decode only I frames (*1) for viewing when

CPU usage is critical. The video stream is still recorded at its original frame rate no matter at

what quality it is displayed.

To acquire good video display quality, however, it is suggested that you try to use the layout

containing just enough channels, or make use of Sequence Patrol function.

Local Client - Live View / Playback

On local viewing, ENR determines when to enter Decode-I Mode according to these key

references - your selection of “Layout” and the Video Resolution. A layout consisting of

more channels and high-resolution streams are considered more CPU consuming, which is

more likely to trigger Decode-I Mode. For example, by switching the live view layout from 4x4

style (16 channels) to Quad style (4 channels), the video will appear much smoother.

On a local Live View or Playback view, the conditions below ensures the live streaming to be

displayed at a smooth quality(12~30 FPS); otherwise, ENR will decode only I-frames for

each channel.

*1 A video sequence is composed as a series of GOP (Group of Pictures). Among these

pictures, I-frame (Intra-coded picture) is a fully specified picture with complete image

information, while P-frames and B-frames hold only partial image information.

*2 ENR will automatically turn all channels into Decode-I Mode when

the number of layout channels is more than 8.

*3 ENR will automatically turn any channel into Decode-I Mode when its video resolution

is above 1280 x 720 pixels.

Layout Style

Maximum video resolution

1, 2, 4, 1+5, 2+4, 1+7 (*2)

1280 x 720 pixels (*3)

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 34 35

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ACTi ENR-2000 Series Manual de usuario Pagina 10