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Appendix
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Appendix

Quantization Settings

MPEG-4 Advanced Settings

[Quantization type]   [Min I-frame quantizer]   [Max I-frame quantizer]   [Min P-frame quantizer]

[Max P-frame quantizer]   [Min B-frame quantizer]   [Max B-frame quantizer]   [Trellis quantization]


Quantization type - quantization matrices used to convert the movie. Depends on the video bit rate used, movie type and picture quality.

Quantization type Details
H.263 Recommended to use with bit rates below 900 kbps for the movies with average frame sizes (512x288 and alike - DivX/Xvid movies that fit into one CD) and smaller as this matrix blurs the picture thus increasing the compression ratio and the quality of the output video on lower bit rates. But if the resolution (frame size) is above average (for instance, 720x480) the picture quality will be worse and it is recommended to use bit rates above 900 kbps.

Also suitable for coding the movies with very good picture quality and cartoons.

MPEG Recommended to use with bit rates above 900 kbps (movies that fit into two CD's) as this matrix keeps the picture sharper using more bits of the information to code the video image. Also suitable for coding the movies with not very good picture quality. At higher bit rates sharpens the images.

Quantization type setting can be chosen from the preset list only and cannot be altered.

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Min I-frame quantizer - lets the user configure the minimum quantizer for I-frames. It is strongly recommended that you leave these settings at their default. See also the B-VOPs section for more details on different frames types.

The possible values vary from 0 to 10000. The default value is 1.

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Max I-frame quantizer - lets the user configure the maximum quantizer for I-frames. It is strongly recommended that you leave these settings at their default. See also the B-VOPs section for more details on different frames types.

The possible values vary from 0 to 10000. The default value is 31.

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Min P-frame quantizer - lets the user configure the minimum quantizer for P-frames. It is strongly recommended that you leave these settings at their default. See also the B-VOPs section for more details on different frames types.

The possible values vary from 0 to 10000. The default value is 1.

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Max P-frame quantizer - lets the user configure the maximum quantizer for P-frames. It is strongly recommended that you leave these settings at their default. See also the B-VOPs section for more details on different frames types.

The possible values vary from 0 to 10000. The default value is 31.

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Min B-frame quantizer - lets the user configure the minimum quantizer for B-frames. It is strongly recommended that you leave these settings at their default. See also the B-VOPs section for more details on different frames types.

The possible values vary from 0 to 10000. The default value is 1.

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Max B-frame quantizer - lets the user configure the maximum quantizer for B-frames. It is strongly recommended that you leave these settings at their default. See also the B-VOPs section for more details on different frames types.

The possible values vary from 0 to 10000. The default value is 31.

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Trellis quantization - an advanced algorithm that lets the codec estimate the quality-size ratio and choose the coding variant based on it. Can improve the quality keeping the file size smaller. At the same time the conversion time increases as compared to the conversion with this setting disabled.

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If you are not sure which settings to use you can press the Default button to discard the changes and restore default settings.

When ready press the OK button to accept the changes you have made.

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