Apple Compressor 3 User Manual Page 322

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H.264 for DVD Studio Pro
H.264 for Apple Devices
You can set and configure markers for other output file formats, but they will not be
included in the encoded output file.
Types of Markers
Compressor can import and create the following types of markers.
Chapter markers: Chapter markers allow easy access to index points throughout a DVD,
QuickTime movie, or podcast. Compressor and DVD Studio Pro can both read chapter
markers exported from Final Cut Pro. QuickTime Player can interpret any text track
containing time stamps as a chapter track. Chapter markers can also have artwork and
a URL assigned to them that appear when playing a podcast.
These markers appear as purple in the Preview window timeline.
Podcast markers: Like chapter markers, podcast markers can have artwork and a URL
assigned to them. Podcast markers cannot be used to access frames within the clip,
though, and they do not appear as chapter markers in DVD Studio Pro or QuickTime.
You can use podcast markers to provide a slideshow (with URLs) for users to view when
playing audio podcasts.
Compression markers: Compression markers are also known as manual compression
markers. These are markers you can add to a Final Cut Pro sequence (or in the
Compressor Preview window) to indicate when Compressor should generate an MPEG
I-frame during compression. See Understanding GOPs and Frame Types for more
information on I-frames.
These markers appear as blue in the Preview window timeline and are the type created
when you manually add markers using Compressor. You can convert compression
markers into chapter markers using the Edit item of the Markers pop-up menu.
Edit/Cut markers: Edit/Cut markers are also known as automatic compression markers.
These markers are automatically generated by Final Cut Pro at each cut or transition
point in a sequence. During transcoding, Compressor uses Edit/Cut markers to generate
MPEG I-frames at these points, improving compression quality.
These markers appear as green in the Preview window timeline.
Note: DVD Studio Pro ignores Edit/Cut markers because they can interfere with GOP
alignment for multi-angle DVD video. For more information, see the documentation
included with DVD Studio Pro.
322 Chapter 26 Using the Preview Window
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