Sustainability of Digital Formats
Planning for Library of Congress Collections
Sustainability of Digital Formats
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| Introduction | Sustainability Factors | Content Categories | Format Descriptions | Contact | |
| Full name | AVI (Audio Video Interleaved), Motion JPEG Video Codec |
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| Description | File format that wraps an MJPEG video bitstream with other data chunks, e.g., audio, in an AVI wrapper |
| Production phase | Generally a middle-state format (often used as the video source when producing lower-resolution streaming versions). |
| Relationship to other formats | |
| Subtype of | AVI, |
| Contains | MJPEG, Video codec |
| May contain | WAVE, Audio (interleaved with video) |
| May contain | MP3_CBR, (constant bit rate) audio (interleaved with video) |
| LC experience or existing holdings | |
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| LC preference | See AVI. |
| Disclosure | See AVI and MJPEG |
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| Documentation | See AVI and MJPEG |
| Adoption | AVI is widely adopted for video production and filemaking; commentator John McGowan writes, "Most PC video capture and editing systems capture video to AVI files using Motion JPEG video compression." |
| Licensing and patents | See AVI. |
| Transparency | See MJPEG, especially the note in Description from a newsgroup writer pertaining to the difference between JPEG and MJPEG. |
| Self-documentation | See AVI and MJPEG, especially the note in Description from a newsgroup writer pertaining to the difference between JPEG and MJPEG. |
| External dependencies | See AVI. |
| Technical protection considerations | See AVI. |
| Moving Image | |
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| Normal rendering | Good support. |
| Clarity (high image resolution) | Moderate to very good, given that this is a format typically used for compression and that most AVI implementations do not support interlaced video. Outcome will depend on the type and extent of compression, and the encoder used. High resolution work is limited in the Windows environment due to file size limits (2 GB with FAT 16 technology; theoretical 8 GB with later technologies). Note that use of OpenDML extensions to AVI would permit MJPEG with interlaced video and other features that increase clarity. |
| Functionality beyond normal rendering | See AVI |
| Tag | Value | Note |
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| Filename extension | avi |
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| Internet Media Type | See related format. |
See AVI |
| Magic numbers | See related format. |
See AVI |
| Microsoft FOURCC | MJPG |
See, for example the archived version of the Microsoft registry of FOURCC and WAVE codes mounted by IANA. |
| General | |
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| History |
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