The Digital Fact Book - Quantel

HDVHigh definition DV is a tape format that stores long GOP MPEG-2 encoded HD video ontoDV or MiniDV tape cassettes. There are two standards. One is 1280 x 720 lines at 60, 50,30 and 25P frame rates with a target compressed video rate of 19 Mb/s. The other is 1440x 1080 lines at 50 and 60I interlaced vertical rate with a target bit rate of 25 Mb/s. All videosampling is 8-bit 4:2:0, 16:9 aspect ratio so the 1080-line format does not use square pixels.Audio is two channels of 48 kHz, 16-bit and uses MPEG-1 Layer 2 compression producing384 kb/s total.At its introduction in 2004, HDV represented a huge drop in price for HD camcorders.However the quality is ‘prosumer’ but it has opened up a new layer of operations for HD.Also the SD downconverted output is better than the usual SD DV results. The use of longGOP coding impedes frame-accurate editing.HSee also: AVC-IntraHE-AACSee AAC, MPEG-4HexadecimalA numbering system, often referred to as‘Hex’, that works to base 16 and is particularly usefulas a shorthand method for describing binary numbers. Decimal 0-9 are the same as Hex,then 10 is A, 11 is B, up to 15 which is F.See also: BinaryDecimal Binary Hex0-9 0-1001 0-910 1010 A11 1011 B12 1100 C13 1101 D14 1110 E15 1111 F16 10000 1027 11011 1B100 1100100 64255 11111111 FF101