Bitrate panel
The
Bitrate
panel (see
on page 54) sets a specific bandwidth limit for the
encoded stream.
Limit Mode
— This drop-down list contains management modes that limit the
instantaneous traffic on the network and drops traffic when the bandwidth rate is
exceeded. This is useful when the network connection between the source and display
has limited bandwidth.
NOTE:
Rapidly changing content may produce instantaneous peaks in bandwidth
rate when using PBR-F management mode.
Six bandwidth management modes are supported.
•
None
— This mode does not use bandwidth management. Only the underlying
compression settings are managed.
•
Manual Frame Drop
— This mode allows the user to specify the precise fraction
of frames to drop. This mode does not manage the bandwidth rate at a fixed level,
but does result in a smoother display update when using rapidly changing video
content types.
•
Shared Flowrate (FD)
— This mode limits the total video network traffic for the
source. Frames are dropped if the
instantaneous
data rate is higher than the
flowrate entered in the
Target
Rate
(Mbps)
field.
•
Peak Flowrate (FD)
— This mode limits the video network traffic for a single
source stream. Frames are dropped if the
instantaneous
data rate is higher than
the flowrate entered in the
Target
Rate
(Mbps)
field. Using
N
output streams
increases the bandwidth
N
times unless the multicast RTP transport protocol is
used.
•
PBR‑F
— This mode dynamically modifies the compression settings to limit the
transmitted bandwidth depending on the specified value entered in the
Target
Rate
(Mbps)
field. The specified
Compression
setting is used as the minimum
compression value. This control mode averages the bit rate over a period of two
frames.
•
PBR‑F (FD)
— This mode is the same as
PBR-F
except frames are dropped when
a larger bandwidth reduction (such as a reduction that cannot be achieved with
compression settings alone) is required.
Target Rate (Mbps)
— This field is used in all bandwidth management modes (except
Manual
Frame
Drop
) to specify the network bandwidth used by the source. This value
is specified in Megabits per second (Mbps).
Frame Drop (%)
— This field is used in
Manual
Frame
Drop
mode and specifies the
percentage of frames to discard. A value of
95%
discards 19 out of every 20 frames
reducing a 60 frames per second (fps) video signal to 3 fps (1 fps is the minimum frame
rate). A value of
99%
results in all frames being dropped due to rounding.
VNM EC 200 • Device Configuration and Control
57
Summary of Contents for VNM EC 200
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