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added advantages/disadvantages of encapsulation
The description of how to include a certain data type into Ogg is generally straight-forward from its description and is therefore included below as a suggestion.
The advantages of including timed text data inside Ogg are:
* The captions travel with the file whenever the soundtrack travels, so they don't get dropped when the file is moved around.
* Using a design accepted by non-Web player apps is more likely to lead to positive network effects through applicability of the same code or authoring effort in different contexts.
The disadvantages are:
* To replace or add a timed text track to an existing video file, one needs to re-encode (re-encapsulate) the file.
* A user agent will only be able to access the text data after decoding, which may take the full duration of the media file - instead with a text file, it would get all the data already in readable form and up-front.
