Datavideo SHOWCAST 100 4K Switcher with Built-In Streaming Encoder - Manual (Page 60)

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
Main

Baseline
Entropy
There are two coding options available for generating H.264 content:

CAVLC (Context-Adaptive Variable Length Coding)

CABAC (Context-based Adaptive Binary Arithmetic Coding)
CABAC encoding provides a 7-10% quality improvement over CAVLC but requires an extra 10-15%
CPU. CABAC encoding is only available in H.264 Profiles Main & High. When targeting at low-powered
devices, such as older cell phones and tablets, we recommend the Baseline Profile that uses
CAVLC which requires less computing power.
GOP
GOP pattern with longer GOP length encodes video very efficiently. Shorter GOP lengths usually work
better with video that has quick movements, but they do not compress the data rate as much.
Depending on your applications, you can select 16 GOP sizes ranging from 1 to 255.

255

240

200

120

100
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60

50

30
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25

20
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15
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10
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5
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3
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2
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1
Encoder Mode
The Encoder Mode sets the video bitrate mode for your video stream. The available modes are listed
as follows:

High (8M)

Medium (4M)

Low (2M)
Tip: You can also switch between different bitrate modes by pressing the BITRATE button in the
H.264 Encoder button group. See Section 6.4 for details.