Bandwidth management – advanced control, Bandwidth management, Advanced control – Extron Electronics VN-Matrix 250 User Guide User Manual
Page 75
Bandwidth Management – Advanced Control
6.
If necessary, click More Detail to open the Video Quality and Bandwidth panel:
1
1 2
2
3
3
4
4
5
5
6
6
7
7
8
8
Figure 51.
Encoder Video Bandwidth Tab Advanced Control
Spatial compression luminance and chrominance settings
7.
Set the
Luminance
(see figure 51,
1
) and
Chrominance
(see figure 51,
2
) values
from the appropriate drop‑down list. These controls are normally locked, using the
Lock
check box (see figure 51,
3
), with an offset of 2 units between them.
A
Luminance
value of
0
provides the minimum spatial compression; a
Luminance
value
of
10
provides the maximum spatial compression.
8.
If required, the
Chrominance
compression can be set independently by clearing the
Lock
check box. A spatial compression setting of
4
/
6
(luma 4; chroma 6) provides
visually lossless compression.
9.
Apply temporal compression by selecting the
Temporal
check box (see figure 51,
4
).
By default, this option is selected.
10.
Adjust the
Threshold
(see figure 51,
5
) to modify the detection point of the temporal
compression algorithm. A value of
0
results in all changes between frames being sent.
As the threshold value is increased, only changes above a certain level are sent, thus
reducing the bit rate.
NOTE: This control compensates for sources with high levels of noise.
11.
Enable
Chroma
(see figure 51,
6
) to determine whether the temporal algorithm should
consider changes in the color or chrominance of the image. Enabling
Chroma
gives
better results on digital simulation type sources but will result in a higher bit rate for any
given compression.
12.
Adjust the
Refresh
Rate
(see figure 51,
7
) to control how frequently the non‑changing
parts of the screen are updated in temporal compression mode. A refresh rate setting of
1
is suitable for most applications.
13.
If it is necessary to set a bit rate limit, select the control
mode from the
Mode
drop‑down box (see figure 51,
8
and
see the figure at right).
See
on page 48 for a
complete explanation of these options.
None
None
Manual Frame Drop
Shared Flowrate (FD)
Peak Flowrate (FD)
PBR-F
PBR-F (FD)
None
VNM 250 • Configuration with the VNM 250 GUI
69