DV formats explained

hey, my son told me about that The audio, video, and metadata are packaged into 80-byte Digital Interface Format (DIF) blocks. so tell me this information true or not? also give me the details about how to explain the Digital Interface Format (DIF) blocks? give me all the details as soon as possible?

[sumit]

DV is a format for storing digital videos. It was launched in 1995 with joint efforts of leading producers of video camera recorders.

The original DV specification, known as Blue Book, was standardized within the IEC 61834 family of standards.


Format Description Properties Explanation of format description terms
ID: fdd000173
Short name: DV-DIF
Content categories: moving-image
Format Category: encoding, file-format
Other facets: binary, unstructured, sampled
Last significant FDD update: 2011-12-26
Draft status: Full

Identification and description

Full name DV-DIF (Digital Video Digital Interface Format)

Description
Interface format for DV, the Digital Video family of related video encodings (DV, DVCAM, and DVCPRO). A frame of data in the DV format stream is divided into several DIF sequences, each of which is composed of an integral number of 80-byte DIF blocks. DIF blocks are the basic units of DV streams, and each block contains a 3-byte ID header that specifies the block type and its position in the DIF sequence. There are five types of DIF blocks: DIF sequence header, Subcode, Video Auxiliary information (VAUX), Audio, and Video. 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.

DV encoding is described in DV. More information on DV-DIF is provided in Notes below. Comments on this format description are welcome.

Production phase Generally a initial-state or middle-state format.
Relationship to other formats
Used by DV, Digital Video Encoding (DV, DVCAM, DVCPRO)
Used by AVI_DV, AVI, DV Digital Video
Used by QTV_DV, QuickTime Video, DV Digital Video
Used by MXF_GC_DV-DIF, MXF Generic Container Mapped to DV-DIF Data
Used by Other file wrappers, not documented here

Local use Explanation of format description terms
LC experience or existing holdings See DV
LC preference See DV

Sustainability factors Explanation of format description terms
Disclosure See DV
Documentation See DV
Adoption See DV
Licensing and patents See DV
Transparency See DV
Self-documentation Pertains to the file format; see the subtypes listed above or the wrappers AVI, QuickTime, and MXF.
External dependencies None for files; see DV for information about videocassette applications.
Technical protection considerations Pertains to the file format; see the subtypes listed above or the wrappers AVI

Quality and functionality factors Explanation of format description terms
Moving Image
Normal rendering See DV
Clarity (high image resolution) See DV
Functionality beyond normal rendering See DV
Sound
Normal rendering See DV
Fidelity (high audio resolution) See DV
Functionality beyond normal rendering See DV

File type signifiers and format identifiers Explanation of format description terms
Tag Value Note
Filename extension dv
dif
For unwrapped "raw" files. For wrapped files, see AVI_DV, QTV_DV, and MXF_GC_DV-DIF.
Internet Media Type video/x-dv
For unwrapped "raw" files, from The File Extension Source. For wrapped files, see AVI_DV, QTV_DV, and MXF_GC_DV-DIF.
Magic numbers Not found. Comments welcome.
None discovered for raw files

Notes Explanation of format description terms
General
SMPTE 383M (MXF Mapping of DV-DIF to Generic Container) reports that single-frame distributions of DV-DIF data are defined in SMPTE 314M, SMPTE 370M, IEC 61834-2 (for a complete list of specification documents, see DV format specifications). SMPTE 383M (page 2) also reports:

For 60-cycle systems, there are ten identical DIF sequences in each DIF channel.
For 50-cycle systems, twelve. Each DIF sequence is assigned to a DIF channel.
For 25 MB/s IEC DV and DV-based compression: one DIF channel.
For 50 MB/s DV-based compression: two channels.
For 100 MB/s DV-based compression: four channels.