Apple Compressor (4.0) - Manual (Page 96)

Chapter 5 Custom settings and output formats 96
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GOP Size: Choose how many frames are contained within your GOP, following the format of the
chosen GOP structure. The maximum GOP size you can choose within Compressor is 15 frames
(NTSC) or 12 frames (PAL and 720p). The minimum GOP size for all video formats is 6 frames
(closed GOP) or 7 frames (open GOP). The relationship between GOP structure and GOP size
gives you GOP patterns. For more information, see
About GOPs (groups of pictures) on page 99.
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Pattern: This field cannot be edited but displays the actual GOP pattern based on your chosen
GOP structure and size.
Extras tab
You use the Extras tab to include or exclude specific MPEG-2 authoring information.
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Add DVD Studio Pro metadata: Selecting this checkbox allows Compressor to parse specific
MPEG-2 authoring information during the transcoding process to accelerate the import
process into DVD Studio Pro. However, these MPEG-2 files will be incompatible with versions of
DVD Studio Pro 1.5 or earlier. Leaving the checkbox unselected means the information will be
parsed later in DVD Studio Pro.
Note: MPEG-2 streams with additional DVD Studio Pro metadata are compatible only
with DVD Studio Pro 2 (or later). MPEG-2 streams created with this checkbox selected are
incompatible with versions earlier than DVD Studio Pro 2 or with other DVD authoring
tools. All Apple settings have this checkbox selected by default. To make your MPEG-2 files
compatible with other DVD authoring tools, deselect this checkbox, and then save the setting.
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Include Chapter Markers only: Selecting this checkbox excludes unnamed compression markers
from the stream but still retains the chapter markers. Leaving the checkbox unselected allows
all markers to be recognized in the output media file. For more information about chapter
markers, see
Add compression or podcast markers on page 49.