摘要 |
A data file containing metadata and/or control data is synchronized with associated audio/video data by subliminally embedding a key in a frame of the audio/video. The key indicates the location of the data file and a time after the embedded frame in which the data file is to be activated to be in synchronism with the audio/video. The data file is accessed via an alternate channel and held in a buffer until the time indicated by the key. The metadata from the data file is played out for display in synchronism with the associated audio/video data, and instructions contained in the control data are executed in synchronism with the associated audio/video data.
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