Authoring: interleaving

• CD-I and other CD-based applications use interleaving to avoid pauses or delays during playback that would result from the long seek-time involved in fetching data from another location on the disc.
• Interleaving allows synchronized playback of multiple media, such as audio and video, that should be played together, by keeping them in the same stream (file) --- making each type of data available when needed, alternately.
• Interleaving also can keep the several languages of an audio program in the same stream, so that switching from language to another will not involve a disc seek.
• Interleaving also can keep the several possible choices of an interactive sequence in the same stream, so no matter what choice the user makes, the subsequent playback sequence is immediately available, without delays caused by a disc seek.