Display video performance, Local live view / playback – ACTi ENR-1000 User Manual
Page 10
ENR-1000 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 Live View / Playback
On local view display, ENR determines when to enter Decode-I mode according to these key
references
– (1) your selection of “Layout” and (2) 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. Take ENR-1100 for example, by
switching the live screen layout from 4x4 style (16 channels) to Quad style (4 channels), the
video will appear much smoother.
On a local Live or Playback screen, 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
.
Model
Layout Style
Video Resolution
ENR-1000
1, 2, 4
Not higher than
1920 x 1080 pixels
ENR-1100
1, 2, 4, 1+5, 2+4, 1+7, 9
ENR-1200
(*2)
1, 2, 4, 1+5, 2+4, 1+7
Not higher than
1280 x 720 pixels
(*3)
(*1)
A video sequence is composed of 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-frame and B-frame hold only partial image information.
(*2)
ENR-1200 will automatically turn all channels into Decode-I Mode when the number
of layout channels is more than 8.
(*3)
ENR-1200 will automatically turn a channel into Decode-I Mode when its video
resolution is above 1280 x 720 pixels.
1
1
1
2
2
2
4
4
4
9
9
9
1
1
1
2
2
2
1
1
1
6
6
6
6
6
6
8
8
8
1
1
1
3
3
3
6
6
6
1
1
1
0
0
0