| 摘要 |
A description of types of metadata can provide, in one embodiment, an index to the types of metadata in a time based metadata track that can be associated with a time based media track having audio or video or both. The description can be non-time based and be separate from the metadata track, and the description can be examined to determine whether a particular type of metadata exists in the time based metadata track without having to search through the track to determine whether the particular type of metadata exists.
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