The Digital Fact Book - Quantel

Cut (edit)A transition at a frame boundary from one clip or shot to another. On tape a cut edit isperformed by recording (dubbing) the new clip at the out-point of the last, whereas withFrameMagic’s true random access storage no re-recording is required – there is simplyan instruction to read frames in a new order. Simple nonlinear disk systems may need toshuffle, or de-fragment their recorded data in order to achieve the required frame-to-frameaccess for continuous replay.CDThe editable frame boundaries may be restricted by video coding systems such as MPEG-2,MPEG-4, VC-1, etc. Non-compressed component video and that is compressed using I-frameonly compression (e.g. DV, motion JPEG, motion JPEG 2000 or I-only MPEG-2) can be editedon any frame boundary without additional processing.See also: Fragmentation, I-frame onlyMPEG–2(MP@ML)Editable framesJPEG & DV,I-frame onlyMPEG–2Editable framesD1A format for digital video tape recording working to the ITU-R BT.601, 4:2:2 standard using 8-bitsampling. The tape is 19 mm wide and allows up to 94 minutes to be recorded on a cassette.Introduced in 1986, Sony’s D1 VTR set a benchmark as it was the first uncompressedcomponent digital tape format. It offered very high quality, only small degradation over manyre-record generations and, with its high chrominance bandwidth, allowed excellent chromakeying. Despite the advantages, D1 use was limited by high cost and is rarely found today.However the term ‘D1’ is still occasionally used to imply uncompressed component digitalrecording – ‘D1’ quality.See also: D2, DVTR51