User Manual-Mac

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Chapter 9, Using Matrox MXO2 with Supported Programs
¦NoteIf you’re using the Matrox MPEG-2 I-frame codec for playback, some of
the options described in this section may not apply.
1 Under Motion, select the frame rate for your captured video in Frames per
second
, and enter a target data rate in the Limit data rate to box.
¦NoteThe data rate must be between 10 Mb/s (975 KB/s) and 300 Mb/s
(36621 KB/s) for SD material, and 50 Mb/s (6100 KB/s) and 300 Mb/s for
HD material.
2 To apply advanced compression settings, set the options under Compressor.
The default settings for the advanced options provide good results for most
applications. We recommend that you change these settings only when
needed for special purposes.
$ Select your desired Scan pattern:
• Regular Sets the regular zig zag scanning pattern of the AC
coefficient of the DCT block as defined in the ISO/IEC 13818-2 (figure
7-2) specification document.
• Alternate Sets the 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 document. Use this setting when capturing video at a
high data rate.
$ Select your desired Rounding type:
• MPEG-2 Rounds the AC coefficient up to the nearest whole number
when calculating the quantization coefficient.