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DM-NVX-35x(C) Encoders/Decoders
Product Manual – DOC. 7839M
Fixed, Adaptive, or Variable Bit Rate
NOTES:
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Configuration of a fixed, adaptive, or variable bit rate setting is applicable to a
DM-NVX-35x(C) device that functions as a transmitter.
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A nonblocking network is required for DM NVX devices.
The bit rate of a stream can be set to fixed, adaptive, or variable:
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A fixed bit rate, also referred to as Constant Bit Rate (CBR), is user specified and
can be set to a value ranging from 200 Mbps to 950 Mbps.
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Adaptive bit rate (ABR) enables the encoder to automatically set a fixed bit rate
based on the input resolution of the stream. For example, the adaptive bit rate
for a common resolution such as 1920x1080p@60Hz (1080p60) would
automatically be set to 400 Mbps. Adaptive bit rate makes better use of the
available bandwidth than a user-specified fixed bit rate.
The following table lists common resolutions and the associated adaptive bit rate
setting.
Resolution and Associated Adaptive Bit Rate Setting
RESOLUTION
PIXELS PER SECOND
ADAPTIVE BIT RATE
(Mbps)
720x480@60 Hz (480p60)
20,736,000
302.777778
1280x720@50 Hz (720p50)
46,080,000
326.543210
1280x720@60 Hz (720p60)
55,296,000
335.185185
1920x1080@50 Hz (1080p50)
103,680,000
380.555556
1920x1080@60 Hz (1080p60)
124,416,000
400
3840x2160@24 Hz (4k24)
199,065,600
470
3840x2160@25 Hz (4k25)
207,360,000
477.777778
3840x2160@30 Hz (4k30)
248,832,000
516.666667
3840x2160@50 Hz (4k50)
414,720,000
672.222222
3840x2160@60 Hz (4k60)
497,664,000
750
4096x2160@50 Hz (DCI50)
442,368,000
698.148148
4096x2160@60 Hz (DCI60)
530,841,600
781.111111
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Variable bit rate (VBR) enables the encoder to automatically vary the bit rate
based on the content and input resolution of the stream. The bit rate can vary
from less than 150 Mbps to a maximum of 750 Mbps. A variable bit rate results in
the use of less bandwidth to produce the same image quality as a user-specified
fixed bit rate or an adaptive bit rate.
Summary of Contents for DigitalMedia DM-NVX-350
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