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DV compression
DV denotes the compression and data packing scheme introduced for consumer digital video cassette (DVC) recorders and later adapted for professional use. DV compression uses discrete cosine transform (DCT), quantization, and variable-length encoding (VLE) comparable to JPEG; however, DV does not conform to the JPEG standard: Optimizations have been made to accommodate interlaced scanning, constant bit-rate (CBR) operation, and other features related to videotape recording. Interlace is handled by allowing the encoder to dynamically choose between frame and field modes. Constant bit-rate is achieved by dynamically altering the quantization matrices to avoid exceeding the available capacity.
Consumer DVC has a data rate of 25 ...
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