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Digital File Formats for Videotape Reformatting

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Digital File Formats for Videotape Reformatting Federal Agencies Digitization Guidelines Initiative Digital File Formats for Videotape Reformatting Part 1. Detailed Matrix for Wrappers (unified large table) This table presents all of the information in a single table to facilitate comparisons. All pages after this cover are intended for printing on 11x17-inch paper. Part 2 provides the same information on multiple, easily printable pages. September 8, 2014 The FADGI Audio-Visual Working Group http://www.digitizationguidelines.gov/audio-visual/ Digital File Formats for Videotape Reformatting: Part 1. Detailed Matrix for Wrappers MPEG-2 ATTRIBUTES Scoring Conventions Considerations AVI MOV Matroska MXF (ad hoc .mpg file format) Sustainability Factors Good Acceptable Does complete technical documentation exist for this Good Well-documented format with open standards available at no cost. The OpenDML Acceptable format? specification written in 1996 is one of the primary sources of information about AVI. Well-documented format with standards available for a fee. Several SMPTE standards exist to Well-documented format with open standards available at no cost. There is a The RIFF specification, released by Microsoft and IBM, is also a key document. Format and documentation continue to evolve and increase in level of detail. The specification for describe MXF. The main file format standard is SMPTE 377-1:2011 Material Exchange Format Is the format a standard (e.g., ISO)? Classic Version of the QuickTime File Format specification (2001) and a current Poor Good Additionally, Microsoft provides thorough information about the format, including Matroska is considered to be a draft, but its proponents consider it stable enough that developers could (MXF) - File Format Specification. The remaining standards specify how to handle metadata, version of the QuickTime specification (2012). It seems like Apple is maintaining Disclosure Acceptable detailed information about file structures and labels via its Developer Network use it as a reference in order to refine libmatroska. The Matroska open-source community seems to be ancillary data and various essence encodings. How stable is the standard? and updating this current version. Ad hoc format that lacks documentation. The .mpg format is an ad hoc wrapper that is not Poor website. Some applications may add proprietary chunks which are not covered in actively maintaining and updating the specification; they are currently developing version 4. specified in or documented by any standards. the above documentation. The Advanced Media Workflow Association (AMWA) is the industry group that has taken Are source code for associated rendering software, Apple maintains portals and forums for developers. They also provide SDKs and Source code for ffmpeg (which provides good support for the Matroska format) is available for free. responsibility for creating and publishing 'application specifications' which describe more narrow validation tools, and software development kits widely other resources for working with the QuickTime multimedia framework There are also SDKs available for developers using DirectShow, Microsoft's The Matroska website also provides supporting diagrams and text that further document the format. implementations of the standard that are suited to specific purposes. This has helped to increase available for this format? (sometimes available only with a fee or subscription). multimedia framework. Those SDKs are also available on a website dedicated to interoperability among various applications that claim to support the standard. developers building applications for the desktop environment. Is this format likely to become obsolete short, Moderate Moderate Moderate medium, or long-term? Wide Moderate Relatively old and well-established format. Most applications currently support the Relatively new format that is beginning to be adopted in the cultural heritage and open source Widely adopted in the broadcast and film industries. The cultural heritage community has begun Low How widely adopted is the format in the vendor Well-established format that is used in both the production and cultural heritage AVI, but this may change in the short to medium-term as other more modern formats communities. A growing number of software tools can work with the format- ffmpeg and Handbrake, for to adopt the standard, but it is not yet widespread. It is unlikely that MXF will become obsolete, Adoption Moderate community? communities. Most applications currently support the format, increasingly even Used by some cultural heritage institutions to store preservation masters. It is widely used take its place. example. Most tools that support Matroska come out of the open source (as opposed to commercial) even in the medium to long-term. Both SMPTE and AMWA continue to maintain and develop the Wide those that run on the Windows platform can capture and/or transcode to MOV. throughout the production and cultural heritage communities as an intermediate or mezzanine- community. Most tools that work with Matroska seem to run on Windows or Linux platforms. standard. Are there user communities/developer communities level format. Digitization Services at NARA, Rutgers and Austrian Mediathek use AVI for that are actively discussing the format and its further Stanford University and New York University use MOV for preservation purposes. preservation purposes. The City of Vancouver Archives uses Matroska (MKV) for preservation purposes. The Library of Congress and Library and Archives Canada use MXF for preservation purposes. development? Moderate Good Poor Good Good Good Transparency Transparency refers to the degree to which the digital MediaInfo provides a decent amount of information, but this is somewhat dependent on the Acceptable object is open to direct analysis with basic tools. Fairly transparent format. The QuickTime player has a 'Movie Inspector' feature essence. For example, IMX MXF displays more information than JPEG-2000 encodings in MXF. Basic tools can open .mpg file, but most of the metadata they extract and provide to the user is Poor Fairly transparent format that can be easily viewed using a hex editor. Somewhat transparent format. It can be analyzed using the free tool ffprobe. that provides basic information about the technical properties of the file. In some cases, specialized tools are required to work with MXF files even for playback or metadata stored in the essence, not the wrapper. viewing. Does the format offer ample documentation (e.g., Acceptable Good Good Good Good metadata) that makes the digital object a completely Poor Self-Documentation Acceptable self-describing entity? Include basic technical metadata that make the digital object fairly self-describing. Include a significant amount of technical metadata. Optional descriptive metadata Include a significant amount of technical metadata. Optional descriptive metadata is also well- Include a significant amount of technical metadata. MXF files also provide rich support for optional Poor Some modern video features are notably absent; see below for additional info. Most metadata stored in the essence, not the wrapper. is also well-supported. supported. descriptive and administrative metadata. Does the metadata fully describe the file/file format? Optional descriptive and administrative elements can be included as well. Acceptable Requires that basic technical metadata be stored in various header fields. This Good Good Good includes characteristics like video standard, frame rate, bit rate, bit depth and others. More modern characteristics such as scan type and pixel aspect ratio are not Many of the key technical metadata fields are required as part of the file structure. Technical metadata is typically stored in the 'Track' section for the different pieces of the file. For Poor What embedded metadata standards are available Robust support for technical, descriptive and administrative metadata. Many technical metadata included as required technical metadata. Throughout other chunks (or tags) in the MOV files store technical metadata in various types of atoms, sometimes referred example, basic characteristics of the video data like sample rate and bit depth are stored in the Track for this format? How mature are the schemas for fields are required as part of the MXF header structure. Good file, additional descriptive metadata can be included. For example, the INAM chunk to as movie resources. These atoms contain information about timescale, color section. Technical metadata is held at the essence level, not the file level. Also, standardized methods Native Embedded Metadata Capabilities each? Acceptable can give the title and the IART chunk can be used to name the creator (or artist) values, and the types of video and audio compression used. of carrying descriptive data (program title and episode number, for example) are only specified DMS (Descriptive Metadata Schemes) developed by AMWA (Advanced Media Workflow Poor responsible for an item. Adding additional metadata requires specialized tools. Descriptive metadata is included via the 'Tags' in the file.; these are analogous to ID3 tags in an MP3 at the essence level and not at the file level. What is the extent of use of the embedded metadata Association) members can also be used to include technical, descriptive and administrative MOV files can include a significant amount of descriptive metadata as 'user data.' file and would include information such as actor and director names. and who is using it? metadata. Additionaly, the EBU
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