User manual

Nero Digital expert settings
Seite 51
11.2.4.1 Simple Profile (QuickTime™ compatible)
If you check the Simple profile box, a number of options in expert mode are grayed out and
cannot be changed. The output file is thus encoded in the MPEG-4 simple profile (see
MPEG-4 profiles).
11.2.4.2
Quantization
The Quantization drop-down list allows you to choose between H236 Quantization and
MPEG Quantization.
Select MPEG if you want to use your own quantization matrix or change the existing one.
If you do not want to do this, leave the setting at H263 quantization.
11.2.4.3
Pixels
You can choose between Half and Quarter Pixel in the Pixel drop-down list.
Motion is then sought in quarter or half pixel steps. If estimation is in quarter pixels, the
coding process takes longer, but the quality is better
11.2.4.4
Spatial prediction
The Spatial Prediction setting is used to encode macroblocks in correlation with
neighboring macroblocks. In other words, they are coded with difference information relating
to these neighboring macroblock and on the basis of the probability of similarity. The
information from several intracoded neighboring macroblocks is used to be able to predict a
macroblock more accurately.
11.2.4.5
P-VOP
The P-VOP setting enables encoding using P-VOPs.
11.2.4.6
Unrestricted Motion Vectors
If you check the Unrestricted motion vectors box, you allow the motion vectors also to
relate to points outside the frame.
This option improves coding efficiency on the edge of the frame.
11.2.4.7
4 motions vectors per macroblock
The 4 motion vectors per macroblock setting allows the encoder to divide the
macroblocks of 16x16 pixels into four 8x8 pixel macroblocks for the motion search. This
means that there are now four motion vectors instead of one.
This option improves the quality but slows down the encoding process.
11.2.4.8
Bidirectional VOP
The Bidirectional VOP setting permits encoding with the help of B-VOPs.