Video display performance, Local live view / playback – ACTi ENR-1000 User Manual
Page 13
ENR-
1000 Series System Administrator’s Manual
Video Display Performance
On a
live
or
playback
screen, ENR handles displayed video 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 live view when
CPU usage is critical. The video stream is still recorded at its original frame rate regardless
of the display quality.
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 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 quality will
appear much smoother.
On a
local
live
or
playback
screen, try to meet the conditions below for ideal video display
quality(12~30 FPS); otherwise, ENR will decode only
I
-frames for each channel
.
Model
Layout Style
Maximum Video
Resolution on Live
Screen
Maximum Video
Resolution on
Playback Screen
ENR-1000
1, 2, 4
1920
x
1080
1920
x
1080
ENR-1100
1, 2, 4, 1+5, 2+4, 1+7, 9
ENR-1200
(*2)
1, 2, 4, 1+5, 2+4, 1+7
1280
x
720
(*3)
1920
x
1080
(*3)
ENR-2000
(*2)
1, 2, 4, 1+5, 2+4, 1+7
1280
x
720
(*3)
1920
x
1080
(*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 and ENR-2000 will automatically turn all channels into Decode-
I
Mode
when the number of layout channels exceeds
8
.
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