HDV

High definition DV is a tape format that stores long GOP MPEG-2 encoded HD video onto DV 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 1440 x 1080 lines at 50 and 60I interlaced vertical rate with a target bit rate of 25 Mb/s. All video sampling 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 producing 384 kb/s total.

At its introduction in 2004, HDV represented a huge price drop for HD camcorders. However the quality is ‘prosumer’ but it 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 long GOP coding impedes frame-accurate editing.

See also: AVC-Intra