Sustainability of Digital Formats: Planning for Library of Congress Collections
Sustainability of Digital Formats: Planning for Library of Congress Collections |
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| Introduction | Sustainability Factors | Content Categories | Format Descriptions | Contact | |
| Full name | QuickTime Video, MPEG Codec |
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| Description |
File format that wraps a MPEG video bitstream with other data chunks, e.g., audio. [The compiler of this document believes that this refers to MPEG-1. Recent releases of QuickTime production software (version 6.x) are capable of producing MPEG-4 files but this may mean files that conform to the ISO BMFF (Basic Media File Format), saved with the mp4 extension.] |
| Production phase | Used as a final-state format for enduser delivery; may also be used as a middle-state format, e.g., as the video source when producing lower-resolution streaming versions. |
| Relationship to other formats | |
| Subtype of | QuickTime, QuickTime File Format |
| Contains | MPEG-1, MPEG-1 Video Coding (H.261) |
| May contain | Audio streams not documented at this time |
| LC experience or existing holdings | See QuickTime |
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| LC preference | See QuickTime |
| Disclosure | See QuickTime and MPEG-1 |
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| Documentation | See QuickTime and MPEG-1 |
| Adoption | Unknown to the compilers of this document. |
| Licensing and patents | See QuickTime and MPEG-1 |
| Transparency | See MPEG-1 |
| Self-documentation | See QuickTime |
| External dependencies | See QuickTime |
| Technical protection considerations | See QuickTime |
| Moving Image | |
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| Normal rendering | Good support. |
| Clarity (high image resolution) | Moderate, given that this is a format used for compression and does not support interlaced video. QTV_MPEG would be expected to provide the highest quality of the QuickTime codecs described at this web site, although at relatively high bitrates. |
| Functionality beyond normal rendering | See QuickTime. |
| Tag | Value | Note |
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| Filename extension | mov |
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| Internet Media Type | See related format. | See QuickTime |
| Magic numbers | See related format. | See QuickTime |
| Apple Video Sample Description | mpeg |
Four-character code identifying the MPEG video codec, from QuickTime File Format, p. 92. See note on separate printings of specification. |
| General | There seem to have been at least two printings of the QuickTime File Format specification carrying the same date. These were not systematically compared by the compiler of this Web page. Pagination varies between these two printings. The table of four-letter codes for compression types ia found on p. 62 or p. 96, depending on printing. |
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