InterTest IONODES ION-E100-HD User Manual page 25

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4. H.264 Specific Codec Configuration
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Rate Control – Allows you to choose between Variable Bit Rate and Fixed
The first option will instruct the JPEG codec to prioritize bit rate over
Quality.
quality. The second option will instruct the JPEG codec to use the specified
quality setting and vary bit rate accordingly.
Profile – Allows you to select the H.264 codec profile from Baseline, Main and
High profiles. Baseline: does not contain all the optimization that enhances the
visual quality of the video. This profile is the one requiring the least video
processing power. Main: Adds in-loop deblocking filter and CABAC encoding.
Requires more processing power to encode and decode. High: Adaptive 8x8 or
4x4 transforms on the image.
The visual difference is much greater between baseline and main then between
main and high. Also, the differences appear only when the visual quality begins
to degrade (ex: when the quality begins to degrade on baseline profile, switching
to main profile will restore some of the image quality).
Frame Rate – Allows you to specify the frame rate to be used by the codec.
Rate Control – Allows you to choose between Variable Bit Rate and Constant
Bit Rate. The first option will instruct the H.264 codec to dynamically adjust the
bit rate in order to meet both the target quality (QP) and frame rate settings. The
second option will instruct the H.264 codec to prioritize target bit rate and vary
quality (QP) first and frame rate as a last resort.
Min/Max QP – This parameter allows you to specify the compression range that
the codec will use to determine image quality during compression. In order to
force a specific quality setting, you can set the minimum and maximum to the
same value. The lower the value, the better the quality will be.
VBR Aggressiveness – This parameter allows you to specify if the codec
should take into account the level of motion in the image for bit rate calculations.
You can select from Conservative, Moderate and Aggressive options for this
setting. Using the first option, the codec will allow bit rate to drop up to ¾ of the
ION-E100-HD – User manual
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