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ENR-2000 Series System Administrator’s Manual
11
Display Video Performance
For a single Live View or Playback session, the way ENR handles displayed video varies
based on the combination of the following factors, which you should put into consideration
when configuring your view layout:
(1) The number of concurrent displayed channels
(2)
The
format of video
stream, e.g., resolution and frame rate.
To balance system loading, 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 - y
our 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
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
