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 | AVI (Audio Video Interleaved) with Indeo Video Codec |
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| Description | File format with an Indeo video bitstream with other data chunks, e.g., audio, in an AVI wrapper. Indeo versions 3.1 and 3.2 employ vector quantization; versions 4 and 5 use forms of wavelet compression. |
| Production phase | Generally a final-state format for enduser delivery. |
| Relationship to other formats | |
| Subtype of | AVI, AVI (Audio Video Interleaved) File Format |
| May contain | Indeo_3, Indeo Video Codec, Version 3 |
| May contain | Indeo_4 video codec, not separately documented |
| May contain | Indeo_5, Indeo Video Codec, Version 5 |
| May contain | WAVE, WAVE Audio File Format |
| May contain | MP3_CBR, MP3, Constant Bit Rate |
| LC experience or existing holdings | American Memory produced AVI_Indeo files in 1992 and 1993, using version 3.1 or 3.2 of the Indeo codec, options set at 15 fps and 320x240 pixels, and yielding a data rate of about 188 Kb/s. These AVI files were retired and replaced by MPEG-1 and QuickTime files in 1994 and 1995. |
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| LC preference | See AVI. |
| Disclosure | See AVI, Indeo_3, and Indeo_5. |
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| Documentation | See AVI, Indeo_3, and Indeo_5. |
| Adoption | AVI is widely adopted for video production and filemaking; in 2000 or earlier, the expert commentator John McGowan wrote, "Indeo R3.2 is one of the default Video for Windows codecs." |
| Licensing and patents | See AVI, Indeo_3, and Indeo_5. |
| Transparency | See Indeo_3 and Indeo_5. |
| Self-documentation | See AVI |
| 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 does not support interlaced video. Outcome will depend on the version of Indeo employed, the extent of compression, and the encoder used. |
| 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 | IV32 IV41 IV50 |
See the list of FOURCC codes, which also lists a number of additional IV FOURCCs. John McGowan states that IV32 is generally used for Indeo 3; IV41 for Indeo 4, and IV50 for Indeo 5. FOURCC codes are no longer managed by Microsoft, which has developed a new mechanism for identifying rich media types. |
| General | |
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| History |
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