CONFIDENTIAL
Z3-DM816X-VI-RPS RDK V2.00.04a
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33
8.4 The CH1 Tab
Parameter
Options (default in bold)
Notes
Video Source
HDMI
, Component
Where to get input for channel 1.
Note: Channel 2 input is HD-SDI.
Video Resolution
320x180 –
1920x1080
The input resolution for channel 1 [
Note 1
].
Video Bitrate
100 – 12000K (
8000K
)
The bit rate for channel 1.
Video Profile
High
, Main, Baseline
The H264 profile of the bitstream. Generally High
is used for 1080p, Main for D1, and Baseline for <
D1.
Frame Rate Divider
1
, 2, 4
Used to encode at less than the input frame rate
(for example, an input frame rate of 30fps with a
divider of 2 would cause an output stream of
15fps).
Number of B-frames
1
– 3 (
1
)
Used to specify # of B-frames. A value of “1”
means no B-frames. A value of “2” means 1 B-
frame etc.
Number of Temporal
Layers
1 – 4 (
1
)
Used to configure # of pyramidal B-frames the
encoder uses. Increasing this number will
potentially improve quality at lower bitrates.
However, setting this value to something besides 1
also runs the chance of causing an incompatibility
with off-the-shelf decoders, since not all of them
necessarily support pyramidal B-frames.
Bitrate Spike Control
On
, Off
Setting to “On” causes the encoder to aggressively
maintain bitrate even during challenging scenes.
Generally, turning this on and setting # of B-
frames to 3 does a very good job of maintaining
bitrate for even challenging, high-motion content.
VBV-based Max
Picture Size
True
, False
Setting to “True” causes the encoder to use
MaximumDelay to define a virtual buffer size. It
will then apply rate control to make sure this
virtual buffer does not overflow. Setting it causes
tighter rate control, at the potential cost of
