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Selecting your MPEG-2 I-frame settings
8 Under Zig Zag Order, select one of the following:
$ Regular Sets the regular (default) zig zag scanning pattern of the AC
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 recording video
at a high data rate (that is, at a data rate of about 50 Mb/sec for SD video,
or 100 Mb/sec or higher for HD video).
9 Under Rounding Type, select one of the following:
$ 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.
10 Click OK to save your settings.
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