User manual

Nero Recode Manual
39
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Drop-down menu
Max. consecutive B-
frames
Specifies the maximum number of B-frames that can be used in a
GOP.
This drop-down menu is enabled only when the Bidirectional
prediction check box is enabled.
Check box
CABAC
Uses the Context Adaptive Binary Arithmetic Coding encoding
method. This provides great quality along with lossless compression,
but demands high computer power.
Check box
Weighted prediction
If this check box is selected, reference frames can be re-weighted
during motion predictions. This increases the encoding efficiency
especially during cross fading.
The following option is available in the High Profile area:
Check box
8 x 8 Transform
If this check box is selected, the default 4x4 transform used by the
encoder is changed to an 8x8 transform. This allows for better
compression with high-definition resolutions.
This setting depends on the chosen profile.
6.2.3. Encoder Settings Tab for MPEG-4 SP/ASP
On the Encoder Tools tab in the Encoder Settings window you can define settings for
codecs like MPEG-4 SP/ASP. Note that only those settings and values are shown that are
possible and applicable by the selected codec!
The following options are available in the Simple Profile area:
Check box
Unrestricted motion
vectors
If this check box is selected, the motion vectors are allowed to relate
to points outside the frame.
This option improves coding efficiency at the edges of the frame.
Check box
4 motion vectors per
macroblock
If this check box is selected, macroblocks of 16x16 pixels are divided
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.
The following options are available in the Advanced Simple Profile area:
Check box
Bidirectional
prediction
Carries out encoding with the help of B-VOPs.
Drop-down menu
Max. consecutive B-
frames
Specifies the maximum number of B-frames that can be used in a
GOP.