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品牌简介:&美国DVC Digital Video Camera 美国DVC公司是一家生产科学及工业领域高性能数字相机及软件的厂家，包括定量成像，微光成像，材料科学，多光谱相机以及遥感系统。还提供低噪音、高速的模块化相机，可选择单独添加制冷单元，像增强器，光学机械以及软件技术。相机产品具有丰富的功能，广泛的应用领域，紧凑的外观设计，优质的性能。Experts in digital imaging technologySince 1995, DVC has specialized i…
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Format Description Properties
ID: fdd000183
Short name: DV
Content categories:
moving-image
Format Category:
Other facets:
unitary, binary, sampled
Last significant FDD update:
Draft status: Full
Identification and description
DV, DVCAM, DVCPRO (family of related formats)
Description
For the purposes of this Web site, this family of related formats is described together, emphasizing the underlying encoding as it may be stored in media-independent files.
The DV video format, however, was developed in the early 1990s as a media-dependent videocassette format. DV video signals are compressed using discrete cosine transforms (DCT) within each frame, like the the approach used with .
DV does not use frame-to-frame temporal encoding like that employed by
and other MPEG formats.
In the years after its introduction, similar but higher quality elaborations were offered by SONY (DVCAM) and Panasonic (DVCPRO, DVCPRO-50, DVCPRO HD), and these have found their place in professional television production.
DV signals are formatted for transfer between devices in 80-byte blocks referred to as
data (DV Digital Interface Format), and these DV-DIF blocks can be stored as files in raw form (.dv or .dif extension) or wrapped in such file formats as AVI, QuickTime, and MXF.
on this format description are welcome.
Production phase
Generally a initial-state or middle-state format.
&&&&Contains
Digital Video Digital Interface Format
LC experience or existing holdings
Experience and holdings of DV in file form not investigated at this time. Videocassettes of DV, DVCAM, and DVCPRO formats are represented in the collections of the Motion Picture, Broadcasting and Recorded Sound Division.
LC preference
None established
Sustainability factors
Disclosure
Open standards.
Initial specification developed by a consortium of ten companies and standardized by the International Electrotechnical Commission (IEC); elaborations developed by SONY and Panasonic and standardized by the Society of Motion Picture and Television Engineers (SMPTE).
&&&&Documentation
Using shorthand borrowed from SMPTE specification 383M (Material Exchange Format (MXF) -- Mapping DV-DIF Data to the MXF Generic Container, p.2), the documentation for the three compression specifications is as follows.
Full citations are provided in
on this information are welcome.
IEC DV as specified in IEC 61834-2 (operating at 525/60i and 625/50i) [published 1998]
DV-based as specified in SMPTE 314M (525/60i and 625/50i), covers both DVCAM and DVCPRO [published 1999]
DV-based as specified in SMPTE 370M (1080/60i, 1080/50i, and 720/60p), covers DVCPRO HD [published 2002]
Additional specifications that pertain to the broad class of DV formats are listed in
For videocassettes, DV, DVCAM, and DVCPRO are widely adopted.
DV incorporated in files is also widely adopted.
Public television station WGBH (Boston) reports that DVCPRO-50 files are regularly used for program masters.
Apple ships the DVCPRO-50 and -100 codecs with their Final Cut Pro editing product.
Filmmakers who shoot their productions on DV often use DV-25 wrapped in MOV as a de facto preservation format. Using DV in this way has the virtue of relatively small file size which is beneficial to the low- to no-budget filmmaker. The extent of file-based adoption of DVCAM is not known to the c
are welcome.
&&&&Licensing and patents
None identified.
Transparency
Depends upon algorith will require sophistication to build tools.
Self-documentation
Generally pertains to the file format that wraps .
However, embedded met see : "DV attaches metadata to every recorded frame that can tie that frame to its place in the production chain."
External dependencies
N many DV, DVCAM, and DVCPRO content items are recorded on videocassettes specified for those formats
Technical protection considerations
Pertains to the file format that wraps .
Quality and functionality factors
Normal rendering
Good support.
Clarity (high image resolution)
DV, DVCAM, and DVCPRO: moderate to very good, given that sampling is limited to 4:1:1 (NTSC; 4:2:0 for some PAL signals). These three formats carry 8 bits for luma and chroma channels and have a moderate data rate of 25 MB/s.
DVCPRO-50: excellent, the sampling is 4:2:2 with a higher data rate of 50 MB/s.
DVCPRO HD: excellent, the sampling is 4:2:2 with a data rate of 100 MB/s.
According to the article
DVCPRO-50 and DVCPRO HD both carry 8 bits for luma and chroma channels.
Functionality beyond normal rendering
Not investigated at this time.
Normal rendering
Not investigated at this time.
discusses the impact of locked and unlocked audio on the synchronization of picture and sound.
Locked audio is preferred and offered by DVCAM and DVCPRO.
Fidelity (high audio resolution)
Good to excellent.
PCM audio with sampling up to 48 kHz and word length up to 20 bits.
Functionality beyond normal rendering
Not investigated at this time.
File type signifiers
Filename extension
See related format.&
Internet Media Type
See related format.&
Adam Wilt's
(/DV-FAQ-tech.html) and , RTP Payload Format for DV (IEC 61834) Video, are the sources for much of the following:
There are two kinds of DV, one for consumer use and the other for professional. In 1992, AVC-Matsushita (now Panasonic) disseminated a Blue Book pertaining to the format. In 1995, SONY introduced the DV camcorder. In 1998, the original "DV" specification (based on the Blue Book), oriented toward consumer-use digital VCRs, was published as IEC 61834; part 2 specifies the video coding as well as many other elements. The specifications for professional DV were published as SMPTE 306M (1998) and 314M (1999); these two encoding formats are based on consumer DV and used in SMPTE D-7 and D-9 video systems.
By and large, the preceding developments were framed in terms of videocassette media. The RTP payload format specified in RFC ) supports IEC 61834 consumer DV and professional SMPTE 306M and 314M (DV-Based) formats. For several years, many DV devices have provided interfaces such as IEEE 1394 (Firewire) in order to facilitate the movement of video streams into computer files. Increasing interest in media-less handing of the bitstream has led to developments like Panasonic's P2 solid state memory format cards, featured at the National Association of Broadcasters (NAB) trade show in 2005.
Format specifications
IEC 61834-1. Recording - Helical-scan digital video cassette recording system using 6,35 mm magnetic tape for consumer use (525-60, 625-50, 1125-60 and 1250-50 systems) - Part 1: General specifications
IEC 61834-2.
Recording - Helical-scan digital video cassette recording system using 6.35 mm magnetic tape for consumer use (525-60, 625-50, 1125-60 and 1250-50 systems) - Part 2: SD format for 525-60 and 625-50 systems
SMPTE 306M-2002. Television Digital Recording - 6.35-mm Type D-7 Component Format - Video Compression at 25 Mb/s - 525/60 and 625/50
SMPTE 307M-2002. Television Digital Recording - 6.35-mm Type D-7 Component Format - Tape Cassette
SMPTE 314M-1999. Television - Data Structure for DV-Based Audio, Data and Compressed Video - 25 and 50 Mb/s
SMPTE 321M-2002. Television - Data Stream Format for the Exchange of DV-Based Audio, Data and Compressed Video Overa Serial Data Transport Interface
SMPTE 370M-2002. Television - Data Structure for DV-Based Audio, Data and Compressed Video at 100 Mb/s 80/50i, 720/60p
SMPTE 371M-2002. Television - 6.35-mm Type D-12 Component Format - Digital Recording at 100 Mb/s 1080/60i, 1080/50i, 720/60p
Useful referencesURLs
(/DV-FAQ-tech.html).
(/DV-tech.html).
(http://www.ietf.org/rfc/rfc3189.txt).
(http://web.archive.org/web/34/http://www.wdva.org/dvedge/equipmentcont.php).&Article
no longer online, but held by the Internet Archive.
(/dvanalyzer/dv-preservation-data-or-video/).&Features DV-specific information including about stream-embedded metadata.
(http://www.larryjordan.biz/why-video-bit-depth-matters/).& 6,632 Results
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ensearchwebDIGITALVIDEO是什么牌子，多少钱的摄像头啊？_百度知道
DIGITALVIDEO是什么牌子，多少钱的摄像头啊？