D1
A video resolution standard. In the NTSC system, "Full D1" means 720x480 pixels, and in the PAL and SECAM systems full D1 is 720x576. You also see "cropped D1", which is 704xNN, which is useful because the 8 pixels on either edge of the video frame aren't supposed to contain useful information. Therefore, some programs will prefer the cropped D1 resolution to save bandwidth. Other popular resolutions are often described in terms of D1: the SVCD resolution is 2/3 D1 (480xNN) and 352xNN is 1/2 D1. Occasionally you see SIF somewhat inaccurately described as 1/4 D1. videographica

Deinterlace
The process of creating a single frame from the 2 interlaced fields of a video frame. Deinterlacing is used to remove the interlacing artifacts if a still frame is required, or if the video is being used at a different rate than it was created. Extensive Info

Demultiplex
Splitting the video and audio to separate files. Also called "Demux".

Dolby Digital
Dolby's best-known digital system, is used to provide multichannel surround sound in cinemas from 35 mm film, and in the home from laser discs, DVDs, and digital broadcast television, cable, and satellite systems. It enables the transmission and storage of up to five full-range audio channels, plus a low-frequency effects channel (LFE), in less space than is required for just one linear PCM-coded channel on a compact disc.

Drop Frame
Colour video was slowly introduced into broadcast. It was therefore necessary to make it compatible with black and white receivers and to design colour receivers or televisions to be able to receive black and white programming as well. In order to accommodate the extra information needed for colour the b&w’s 30 frame/second rate was slowed to 29.97 f/s for colour. Although usually not an issue for non broadcast applications, in broadcast, the small difference between real time (or the wall clock) and the time registered on the video can be problematic. Over a period of 1 hour (SMPTE) the video will be 3.6 seconds or 108 extra frames longer in relation to the wall clock. To overcome this discrepancy drop frame is used.

Drop frame: Every frame :00 & :01 are dropped for each minute change (60 X 2 = 120) except for minutes with 0’s (00:, 10:, 20:, 30:, 40: & 50:) (6 X 2 = 12, 120 - 12 = 108)

DTV
Digital TV, the standard for broadcasting picture and sound using digital signals, DTV allows for improvements in both picture and sound quality versus conventional Analog TV.
In USA can DTV be delivered in two basic formats: Standard analog Definition (SDTV) or High Definition (HDTV). In Europe is DTV delivered in DVB-formats. USA DTV information.

DV Timecode
Also known as DV Time, a DV or MiniDV camcorder starts recording at 00:00:00. The timecode is drop frame for NTSC (minute differences in timing are made to get the film from 30 fps to 29.97 fps). DV Time is carried on the FireWire cable with the video, audio and Device Control. The biggest problem that arises with DV Time is that it resets to zero if the camera operator does not 'hook' to the end of the previously shot footage (there is an unrecorded gap between recordings).

If dealing with a miniDV or DVCAM tape with 'broken' timecode (that is in many parts), either do a clone copy to another DV tape so that the timecode is created continuously for the entire tape, or name each timecode section as a different tape.

DVB
DVB is an acronym for "Digital Video Broadcasting". DVB was set up by the EBU (European Broadcast Union) to set the standards for digital video transmission. They have published these via ETSI (European Telecommunications Standards Institute) who also set standards for devices such as GSM telephones. In fact there are several DVB standards for different transmission media.Some of these are:
DVB-S Satellite
DVB-C Cable
DVB-T Terrestrial
DVB-SI Specification for Service Information
DVB-CI Common Interface for conditional access

DVD
DVD once stood for digital video disc or digital versatile disc, but now it just stands for DVD -- the next generation of optical disc storage technology. DVD is essentially a bigger, faster CD that can hold cinema-like video, better-than-CD audio, and computer data. DVD Demystified FAQ.

DVD Video Filesystem
A new file system was chosen for DVD video which would suit both read-only and writable versions. This file system is a subset of UDF 1.02 called micro UDF (M-UDF). The main characteristics of UDF are:

- Robust file exchange
- System & vendor independent
- Writable & read-only media
- Based on ISO 13346

DVD-Video discs use only UDF (not ISO 9660) with all required data specified by UDF and ISO 13346 to allow playing in computer systems. The DVD-Video files must be no larger than 1 GB in size and be recorded as a single extent (ie in one continuous sequence). The first directory on the disc must be the VIDEO_TS directory containing all the files. All filenames are 8.3 format.

DVD+R
DVD+Recordable defines a standard for recordable DVD drives and media defined by the DVDRW Alliance. Often called "plus R", the format is write once (compared to DVD+RW wich can be erased and rewritten). The single sided discs can hold 4,700,000,000 bytes (4.38 Gigabytes at 1024 bytes to the kilobyte) with double sided discs holding twice as much. There are no dual layer single sided recordable discs. This format competes with the DVD Forum DVD-R specification.

DVD+R DL
DVD+R DL or called DVD+R9 is a Dual Layer writeable DVD+R. The dual layered discs can hold 7.95 GB or around 8 540 000 000 bytes (called DVD-9) and a double sided dual layered disc 15.9 GB or around 17 080 000 000 bytes (called DVD-18).

DVD+RW
DVD+RW is a ReWriteable media format of the DVD+R standard.

DVD-10
DVD-10 is a double sided single layer DVD which can fit up to 9.4 GB or 8.7 computer GB. Video DVD, DVD-R/W and DVD+R/W supports this format.

DVD-18
DVD-18 is a double sided dual layer DVD which can fit up to 17 GB or 15.9 computer GB which some commercial video DVDs are using today (a DVD-18 is basicly four pressed plastic DVD-5s pressed together, they are not burned). Video DVD supports this format but DVD-R/W and DVD+R/W does not support this format.

DVD-5
DVD-5 is a single sided single layer DVD that stores up to about 4.7 GB = 4 700 000 000 bytes and that is 4.38 computer GigaBytes where 1 kilobyte is 1024 bytes(4 700 000 000B/1024 = about 4 589 843KB/1024 = about 4485MB/1024 = about 4.38GB) . Video DVD, DVD-R/W and DVD+R/W supports this format. Often referred to as "single sided, single layer".

DVD-9
DVD-9 is a single sided dual layer DVD which can fit up to 8.5 GB or 7.95 computer GB which many commercial video DVDs are using today (a DVD-9 is basicly two pressed plastic DVD-5s pressed together, they are not burned). Video DVD supports this format but DVD-R/W and DVD+R/W does not support this format.

DVD-Audio
DVD-Audio or sometimes called DVD-A is a separate format from DVD-Video. It is a format specifically designed to provide the highest possible audio fidelity capable on DVD. DVD-Audio provides for audio in stereo and in multi-channel surround in a wide range of specifications. In addition to audio, a DVD-Audio disk can contain a limited amount of video, which can be used to display text, such as lyrics or notes. DVD-Audio can only be played on DVD Players with DVD-Audio support (most DVD Players do not support this format). DVD-Audio is currently competing with SACD as the new audio defacto standard.

DVD-MP3
This type of disc is created when MP3 audio files are burned on a DVDR/W disc. Very few MP3 capable standalone DVD players supports DVD-MP3 because most players verify DVDR/W as DVD-Video only.

DVD-R
DVD-Recordable defines a standard for recordable DVD drives and media defined by the DVD Forum. Often called "minus R", the format is write once (compared to DVD-RW wich can be erased and rewritten). The single sided discs can hold 4,700,000,000 bytes (4.38 Gigabytes at 1024 bytes to the kilobyte) with double sided discs holding twice as much. This format competes with the DVD+R format.

DVD-R DL
DVD-R DL or called DVD-R9 is a Dual Layer writeable DVD-R. The dual layered discs can hold 7.95 GB or around 8 540 000 000 bytes (called DVD-9) and a double sided dual layered disc 15.9 GB or around 17 080 000 000 bytes (called DVD-18).

DVD-RAM
A recordable format supported by the DVD Forum. It has superior recording features but it is not compatible with most DVD-ROM drives or DVD Video players. It works well when set up like a removable hard disk.

DVD-RW
DVD-RW is a ReWriteable media format of the DVD-R standard.

DVD-SVCD
This is SVCD authored video on a DVDR/W. The DVD standard does not support the SVCD resolution but it may work anyway if the audio has been resampled to 48 khz like the DVD-VCD. Read more here about DVD-SVCD discs.

DVD-VCD
Basically this is VCD content authored on a DVDR/W. DVD supports the VCD resolution but the audio has to be resampled to 48 khz. Read more here how to make such a disc.

DVD-Video
DVD-Video is the video element of the DVD format. DVD Demystified DVD-Video Features.

DVD-VR
The format is known as "DVD dash VR" or DVD-VR. Its actually known from the DVD specification as DVD-RTRW for real-time read/write. One thing that makes it different from the "DVD Video" standard which is used by professionally repliacted DVD's is that the indexing for DVD-VR is forward only. This allows the "writing" of the disc image immediately without having to come up with some cludge to try to write a fully index'd DVD Video file.

DVD±R
A term used to cover both the DVD-R and DVD+R standards in one word.

DVI
DVI stands for (D)igital (V)ideo (I)nterface. DVI is a new form of video interface technology made to maximize the quality of flat panel LCD monitors and high- end video graphics cards. It is a replacement for the P&D Plug & Display standard, and a step up from the digital-only DFP format for older flat panels. DVI is becoming increasingly popular with video card manufacturers, and most cards purchased include both a VGA and a DVI output port.

In addition to being used as the new computer interface, DVI is also coming out as the digital transfer method of choice for HDTV, EDTV, Plasma Display, and other ultra-high-end video displays for TV, movies, and DVDs. Likewise, even a few of the top-end DVD players are now featuring DVI outputs in addition to the high-quality analog Component Video. Don't expect to throw away all your old video cables just yet, but keep an eye out for DVI availability in the future.

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