Metadata As facilities move to file-based workflows,understanding metadata is important

摘要

By now, most engineers have heard that metadata refers to data about data. As facilities move from tape to files, and from tight integration to service oriented-media workflows, it becomes critical for engineers to have a solid understanding of this important topic. The definition of metadata as "data about data" may be accurate, but it is perhaps not entirely useful. Revising the definition a bit, in our industry, metadata typically refers to data about the video and audio - the essence of the program. System designers have found it useful to distinguish between essence and metadata. But just as things are starting to become clear, someone may ask, "What about closed captioning? Surely that is data - right? How about time code?"