Selecting Your Mpeg-2 I-Frame Settings - Matrox MXO2 Installation And User Manual

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Selecting your MPEG-2 I-frame settings

When using the Matrox MPEG-2 I-frame or Matrox MPEG-2 I-frame HD codec
to capture or render video, you can specify various settings for the MPEG-2
I-frame compression.
° To select your MPEG-2 I-frame settings:
Click the Configure button. This displays a dialog box similar to the
1
following:
Drag the Data Rate slider until your desired data rate is displayed. The
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higher the data rate you select, the better the video quality will be. The range
of available data rates depends on whether you're using the Matrox MPEG-2
I-frame HD or SD format.
¡ Important Depending on the capabilities of your system, you may drop
frames if you select a data rate higher than 125 Mb/sec.
To apply advanced settings to your MPEG-2 I-frame file, click the
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Advanced
¦ Note
applications. We recommend that you change these settings only when needed
for special purposes.
Under Rounding Type , select one of the following:
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$
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Under DC Precision , select the bit-depth precision of the DC intra block.
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Chapter 8, Using Matrox MXO2 with Adobe Premiere Pro
button.
The default advanced settings should provide good results for most
MPEG-2 Rounds the AC coefficients up to the nearest whole number
when calculating the quantization coefficient.
Truncates the AC coefficients to the lowest whole
Matrox Custom
number when calculating the quantization coefficient. In some cases, this
setting may yield less artifacts in graphics.