The configuration options have a direct effect on the network bandwidth required for the
encoded stream.
•
Increasing compression decreases the network bandwidth requirements for the stream.
•
Decreasing compression increases the network bandwidth requirements for the stream.
Alternatively, the desired bandwidth can be set using the
and the VN-Matrix adjusts compression and frame rate to meet the specified bandwidth
limit.
NOTE:
This menu is only available when an encoder device is selected.
Video Compression panel
Transform (VN‑Matrix 2xx only)
— Two transform types are supported.
•
graphics
— Optimizes the video to support text and sharp lines, such as are
present on most computer screens.
•
video
— Optimizes the video to support smooth tone changes such as are present
in movies and other video content.
Luma Compression
— This drop-down list sets the amount of compression on the
luma (black and white) portion of the signal. A value of
1
is the minimum amount of
compression available; a value of
10
is maximum compression.
Chroma Compression
— This drop-down list sets the amount of compression on the
chroma (color) portion of the signal. A value of
1
is the minimum amount of compression
available; a value of
10
is maximum compression.
NOTE:
This field is available only when the
Luma/Chroma
Lock
is not selected.
Luma/Chroma Lock
— Selecting this check box automatically sets the chroma
compression value higher than the
Luma
Compression
setting.
When the check box is selected, the
Chroma
Compression
field tracks the
Luma
Compression
field by a fixed value of +1 (Luma Compression = 1) or
+2 (Luma Compression > 1).
Temporal Compression
— Selecting this check box causes areas of the screen
to refresh only when a change between frames is detected. Enabling temporal
compression can significantly reduce network bandwidth.
NOTE:
For all normal operation,
Temporal
Compression
should be enabled.
Refresh Rate
— This field controls how frequently static parts of the screen are
updated when the
Temporal
Compression
check box is selected. This is useful
when connecting new displays to a temporally encoded source and fills in gaps in the
data when using a lossy network transport (such as RTP). A value of
1
refreshes the
screen once a second; a value of
10
refreshes the screen once every ten seconds. A
value of
0
disables the refresh. Valid settings are
1
though
17
.
Threshold
— This drop-down list controls the sensitivity of the temporal change
detection algorithm. A value of
0
means any screen changes will be sent. Increasing the
value increases the send threshold and reduces the network bandwidth. A setting of
0
is suitable for DVI computer generated sources. Sources with more noise or video-type
motion should use a setting between
1
and
4
. Camera sources should always use
values greater than
0
.
VNM EC 200 • Device Configuration and Control
55
Summary of Contents for VNM EC 200
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