Matrox MXO2 Installation And User Manual page 256

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6 Under Rounding Type , select one of the following:
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Select the Force Frame-based DCT setting to render macroblocks as
7
frames rather than as fields. In some cases, graphics will yield less artifacts if
this option is selected.
Click
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time you render material with your program, until you change the settings
again.
Chapter 16, Using the Matrox Video for Windows Codecs
Sets the regular (default) zig zag scanning pattern of the AC
Regular
coefficient of the DCT block as defined in the ISO/IEC 13818-2
(figure 7-2) specification documentation.
Alternate Sets an alternate zig zag scanning pattern of the AC
coefficient of the DCT block as defined in the ISO/IEC 13818-2 (figure
7-3) specification documentation. Use this setting when capturing or
rendering video at a high data rate (for example, at a data rate of 100
Mb/sec or higher).
MPEG-2 Rounds the AC coefficients up to the nearest whole number
when calculating the quantization coefficient.
Matrox Custom Truncates the AC coefficients to the lowest whole
number when calculating the quantization coefficient. In some cases, this
setting may yield less artifacts in graphics.
to save your settings. The settings you selected will be used each
OK