Adobe 65008009 - After Effects CS4 Using Manual page 632

Last updated 12/21/2009
Metadata is divided into two general categories: static metadata and temporal metadata. Static metadata is metadata
that applies to an entire asset. For example, the copyright and author information for a video clip apply to the entire
clip. Temporal metadata is metadata that is associated with a specific time within a dynamic media asset. Beat markers
from Soundbooth and the metadata generated by the Speech Search feature in Soundbooth and Premiere Pro are
examples of temporal metadata.
The Speech Search feature in Adobe Premiere Pro and Adobe Soundbooth provides the ability to convert speech in a
video or audio asset to text metadata. Each word is stored as a metadata element at the corresponding time in the
timeline. When a file with Speech Search metadata is imported into After Effects and used as the source for a layer,
each word appears in a layer marker at the corresponding time. (This assumes that the Create Layer Markers From
Footage XMP Metadata is selected. See
You can view static XMP metadata for a file in Adobe Bridge.
After Effects scripts and expressions can read and use data stored in markers. Because XMP metadata for source
footage items can be converted to layer markers, expressions and scripts can work with XMP metadata. Scripts can also
operate on the XMP metadata for a file outside of the After Effects context, both for the automation of common tasks
and for creative uses.
XMP metadata included in an F4V or FLV file can be read and used by ActionScript, so you can use XMP metadata to
add interactivity to a video playing in Flash Player. One application of this feature is searching within an FLV file for
temporal metadata, which can allow the user to begin playback at a specific word of dialog or at some other time
associated with a specific temporal metadata element.
Dan Ebberts provides a tutorial about XMP metadata on the
step-by-step instructions for using the XMP metadata features in Adobe Creative Suite CS4 Production Premium
Edition. The motivating example in the tutorial is the transcription of speech to text and the creation of a simple video
player with which you can navigate to the places where those words are spoken. Along the way, the XMP metadata is
used to speed up editing, to check for copyright information, and to create simple subtitles (captions).
Go to the XMP Developer Center
XMP metadata with your software and workflow, the XMP SDK (software development kit), and forums about XMP
metadata.
To view video tutorials on working with markers and XMP metadata go to the Adobe website:
•
www.adobe.com/go/lrvid4104_xp
• www.adobe.com/go/lrvid4111_xp
•
www.adobe.com/go/lrvid4112_xp
• www.adobe.com/go/vid0094
More Help topics
"XMP metadata in After Effects" on page 626
"MarkerKey attributes (expression
XMP metadata in After Effects
For an introduction to XMP metadata, see
When After Effects imports a file with associated XMP metadata, you can view the static metadata in the Metadata
panel, convert the temporal metadata to layer markers, use the metadata to facilitate your work within After Effects,
and include the metadata in output files.
"Working with XMP metadata in After
section of the Adobe website for the XMP specification, information on integrating
reference)" on page 681
"About XMP metadata" on page 625.
Effects" on page 627.)
After Effects Developer Center. The tutorial provides
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USING AFTER EFFECTS CS4
Markers and metadata