604:. By design, any RIFF file can legally include additional chunks of data, each identified by a four-character code; software which does not understand that particular code should skip the chunk. As such, it is theoretically possible to expand any RIFF file format, including AVI, to support almost any conceivable metadata. Some of the limitations of AVI in modern use relate to a lack of standardization in this metadata (see Limitations below).
125:
37:
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565:, which is an abbreviation for (en)coder/decoder. Upon creation of the file, the codec translates between raw data and the (compressed) data format used inside the chunk. An AVI file may carry audio and visual data inside the chunks in virtually any compression scheme, including Full Frame (Uncompressed),
715:
Type 1 is actually the newer of the two types. Microsoft made the "type" designations, and decided to name their older VfW-compatible version "Type 2", which only furthered confusion about the two types. In the late 1990s through early 2000s, most professional-level DV software, including non-linear
553:
An AVI file takes the form of a RIFF header, which is then divided into two mandatory chunks and one optional chunk. The first chunk is identified by the "hdrl" tag, which stores the information required by the codec to decompress the AVI file for viewing. The second sub-chunk is identified by the
529:
the video files. They also recognized that because of the hardware requirements for playing the videos in uncompressed quality, which at the time were demanding, it needed to allow users of low-end computers to play the videos in compressed quality. They developed and published the Audio Video
521:
the videos would save a lot of space, but not without degrading the quality of the videos. Publishers who were more concerned about video quality instead were searching for an ideal compression algorithm that would compress the video files while still preserving the quality.
728:
Many FireWire controllers only captured to one or the other type. However, almost all relevant software supports both Type 1 and Type 2 editing and rendering, including Adobe
Premiere. Thus, many users are unaware of the fact that there are two types of DV AVI files.
724:
controllers usually captured to Type 1 only, while "consumer" level controllers usually captured to Type 2 only. Software is and was available for converting Type 1 AVIs to Type 2, and vice versa, but this is a time-consuming process.
656:
Overhead for AVI files at the resolutions and frame rates normally used to encode standard definition feature films is about 5 MB per hour of video, the significance of which varies with the application.
620:
information, although the later OpenDML (AVI 2.0) specification does. Consequently, older players may not select the right aspect ratio automatically (though it may be possible to do so manually).
584:, complain when the "idx1" index sub-chunk is not found, as it is required for efficient moving among timestamps. They offer to "fix" the file by building an index temporarily or permanently.
631:(BWF) extensions were designed to standardize post-production metadata, but an equivalent for AVI files has not emerged. Some parties are known to write BWF chunks into AVI for metadata.
642:) that rely on this function, although this is beyond the intent of the original specification and may cause problems with playback software which does not anticipate this use.
694:
Does not waste much space (audio is saved uncompressed, but even uncompressed audio is tiny compared to the video part of DV), but
Windows applications based on the
659:
AVI files cannot contain attachments such as fonts and subtitles. Consequently, subtitles must be distributed in a separate file or hardcoded into the video stream.
554:"movi" tag, containing the actual audio and visual data that make up the AVI video. The third optional chunk is identified by the "idx1" tag, which indexes the
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675:) solve all these problems, although software is freely available to both create and correctly replay AVI files which use the techniques described here.
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Since its introduction in the early 90s, new computer video techniques have been introduced which the original AVI specification did not anticipate.
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AVI was not intended to contain video using any compression technique that requires access to future video frame data beyond the current frame (
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in AVI files, which affects usability of the format in film and television post-production, although it is widely used. For WAV audio files,
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Type 1: The multiplexed Audio-Video is kept in its original multiplexing and saved together into the Video section of the AVI file
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By way of the RIFF format, the audio and visual data contained in the "movi" chunk can be encoded or decoded by software called a
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can contain both audio and video data in a file container that allows synchronous audio-with-video playback. Like the
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813:(Full draft). Sustainability of Digital Formats. Washington, D.C.: Library of Congress. March 9, 2016
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Interleave format on
November 10, 1992, as part of their Video for Windows, and included support for
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OpenDML group in
February 1996. These files are supported by Microsoft, and are unofficially called "
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Type 2: Like type 1, but audio is also saved as an additional audio stream into the file.
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DV AVI is a type of AVI file where the video has been compressed to conform with
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Publishers faced a predicament regarding how they should distribute videos on
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Supported by VfW applications, at the price of a small increase in file size.
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The original AVI specification does not provide a standardized way to encode
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Microsoft recognized the problem and sought to develop a standard that would
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638:). Approaches exist to support modern video compression techniques (such as
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https://docs.microsoft.com/en-us/windows/win32/directshow/avi-file-format
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editing programs, only supported Type 1. One notable exception was
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1078:"Forensic analysis of video file formats § AVI Container format"
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Many AVI files use the file format extensions developed by the
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audio and video, although these features are seldom used.
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897:"AVI File Format with OpenDML Extensions, Version 1.02"
517:
of space—the storage capacity of most CD-ROMs in 1992.
623:
There are several competing approaches to including a
1012:"Microsoft, vendors team up to air Video for Windows"
412:
600:
in the INFO chunk. In addition, AVI files can embed
421:
1010:Damore, Kelley; Corcoran, Cate (November 9, 1992).
485:defined AVI as the official wrapper for preserving
427:
149:. Unsourced material may be challenged and removed.
1044:"Microsoft Goes Hollywood With Video for Windows"
3151:
1275:Dave Wilson's comprehensive list of FourCC codes
924:"AVI RIFF File Reference - Windows applications"
687:standards. There are two types of DV-AVI files:
835:Lunar Meteoroid Impacts and How to Observe Them
1138:
1009:
872:"What Is an AVI File (and How Do I Open One)?"
1316:
1037:
1035:
991:. Vol. 11, no. 22. pp. 345–346
976:
974:
1270:PVDTools' RIFF-AVI File Format Documentation
1178:"Determining the Shape of Pixels and Frames"
1071:
1069:
1067:
483:National Archives and Records Administration
596:(RIFF), AVI files are commonly tagged with
418:
65:Learn how and when to remove these messages
1323:
1309:
1032:
971:
762:
645:AVI cannot contain some specific types of
21:".avi" redirects here. For the album, see
1097:
1064:
810:AVI (Audio Video Interleaved) File Format
778:
653:audio at sample rates below 32 kHz).
227:Learn how and when to remove this message
209:Learn how and when to remove this message
1265:Microsoft's pages on the AVI file format
1142:Digital Forensics with Open Source Tools
983:"27 Good Reasons To Buy A CD-ROM Player"
720:, which only supported Type 2. High-end
102:of all important aspects of the article.
3170:Microsoft Windows multimedia technology
1139:Altheide, Cory; Carley, Harvan (2011).
663:More recent container formats (such as
501:. Thirty seconds of video displayed in
3160:Computer-related introductions in 1992
3152:
1280:OpenDML (AVI 2.0) format specification
1200:
1052:. Vol. 12, no. 1. p. 39
1020:. Vol. 14, no. 45. p. 3
980:
921:
831:
98:Please consider expanding the lead to
1304:
1041:
869:
739:Comparison of video container formats
1075:
558:of the data chunks within the file.
147:adding citations to reliable sources
118:
71:
30:
1221:"AVI MetaEdit - Technical Metadata"
1042:Quain, John R. (January 12, 1993).
981:Raskin, Robin (December 22, 1992).
870:Gavin, Brady (September 12, 2018).
13:
3114:Comparison of audio coding formats
1201:Rhodes, Phil (December 12, 2014).
288:Uniform Type Identifier (UTI)
14:
3181:
1253:
46:This article has multiple issues.
594:Resource Interchange File Format
544:Resource Interchange File Format
450:in November 1992 as part of its
408:
349:Resource Interchange File Format
123:
76:
35:
1231:
1213:
1194:
1170:
1132:
1114:
1076:Gloe, Thomas (April 16, 2014).
949:"Video Digital Product Options"
134:needs additional citations for
90:may be too short to adequately
54:or discuss these issues on the
2676:ISO/IEC base media file format
1260:John P. McGowan's AVI Overview
1003:
941:
915:
889:
863:
825:
801:
763:Fleischman, Eric (June 1998).
756:
744:List of video editing software
607:
513:resolutions could take up 680
438:) is a proprietary multimedia
399:and known by its initials and
100:provide an accessible overview
1:
1285:AVI file format documentation
766:WAVE and AVI Codec Registries
749:
649:(VBR) data reliably (such as
462:, AVI files support multiple
602:Extensible Metadata Platform
7:
732:
587:
10:
3188:
3119:Comparison of video codecs
1629:(GB/T 33475.2,GY/T 299.1)
1186:. May 2003. Archived from
1099:10.1016/j.diin.2014.03.009
542:AVI is a subformat of the
492:
20:
3165:Digital container formats
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2013:
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1291:Type 1 and 2 DV AVI files
678:
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344:
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534:to satisfy those users.
260:Internet media type
158:"Audio Video Interleave"
2943:Alliance for Open Media
592:As a derivative of the
446:standard introduced by
397:Audio Video Interleaved
1863:MPEG-1 Layer III (MP3)
832:Cudnik, Brian (2009).
393:Audio Video Interleave
312:; 31 years ago
310:November 10, 1992
240:Audio Video Interleave
2881:QuickTime File Format
1082:Digital Investigation
406:, usually pronounced
3140:Compression software
2697:MPEG media transport
1774:Sorenson Video/Spark
1190:on January 13, 2008.
580:Some programs, like
143:improve this article
3138:for techniques and
3136:Compression methods
1632:HDR Vivid(GY/T 358)
571:run-length encoding
527:losslessly compress
519:Lossily compressing
241:
1296:AVI file Structure
1203:"AVI and Timecode"
1122:"WindowsFAQ-1.1.x"
928:docs.microsoft.com
701:do not support it.
401:filename extension
345:Extended from
336:Container for
246:Filename extension
239:
3147:
3146:
2921:
2920:
2839:DivX Media Format
2627:
2626:
2412:
2411:
1812:
1811:
1702:Microsoft Video 1
1637:AVS3 P2(GY/T 368)
1623:(GB/T 20090.2/16)
1156:978-1-59749-586-8
849:978-1-4419-0324-2
575:Microsoft Video 1
507:frames per second
452:Video for Windows
390:
389:
297:Developed by
237:
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229:
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117:
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69:
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2913:VOB, IFO and BUP
2687:Motion JPEG 2000
2638:
2637:
2425:
2424:
2384:aptX Low Latency
2161:Chinese Standard
1825:
1824:
1614:Chinese Standard
1386:Motion JPEG 2000
1355:
1354:
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1318:
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1302:
1301:
1247:
1246:
1239:"Using B-frames"
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955:. Archived from
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780:10.17487/RFC2361
760:
647:variable bitrate
460:DVD video format
440:container format
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329:Container format
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2204:
2176:(GB/T 33475.3)
2170:(GB/T 20090.10)
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2009:
1924:
1920:MPEG-H 3D Audio
1846:MPEG-1 Layer II
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1214:
1209:(Mailing list).
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1149:. p. 190.
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903:. March 9, 2016
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842:. p. 154.
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735:
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610:
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477:". In 2010 the
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307:Initial release
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85:This article's
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3124:List of codecs
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2926:Collaborations
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2692:MPEG-21 Part 9
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2681:MPEG-4 Part 14
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1435:Part 2 / HEVC
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1423:Part 33 / IVC
1421:
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1418:Part 10 / AVC
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1183:Microsoft.com
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1162:September 19,
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487:digital video
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479:US government
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269:video/msvideo
265:video/vnd.avi
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199:December 2007
191:
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174:
170:
167:
163:
160: –
159:
155:
154:Find sources:
148:
144:
138:
137:
132:This article
130:
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59:
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33:
32:
27:
25:
19:
2806:
2190:(GB/T 22726)
1851:Multichannel
1707:MSU Lossless
1621:AVS1 P2/AVS+
1575:TrueMotion S
1513:H.265 / HEVC
1459:Part 1 / EVC
1447:Part 3 / VVC
1413:Part 2 / ASP
1242:
1233:
1224:
1215:
1206:
1196:
1188:the original
1181:
1172:
1160:. Retrieved
1141:
1134:
1125:
1116:
1085:
1081:
1054:. Retrieved
1047:
1022:. Retrieved
1015:
1005:
993:. Retrieved
986:
963:September 1,
961:. Retrieved
957:the original
953:archives.gov
952:
943:
933:September 1,
931:. Retrieved
927:
922:stevewhims.
917:
907:September 1,
905:. Retrieved
900:
891:
879:. Retrieved
875:
865:
853:. Retrieved
834:
827:
817:December 13,
815:. Retrieved
809:
803:
791:. Retrieved
765:
758:
727:
714:
682:
662:
618:aspect ratio
611:
591:
579:
560:
552:
541:
524:
503:24-bit color
496:
474:
468:
403:
396:
392:
391:
340:Audio, video
223:
205:
196:
186:
179:
172:
165:
153:
141:Please help
136:verification
133:
105:
89:
87:lead section
62:
55:
49:
48:Please help
45:
23:
18:
2908:MOD and TOD
2849:Flash Video
2787:3GP and 3G2
2468:HEIC / HEIF
2420:compression
2180:Audio Vivid
1915:MPEG-D USAC
1910:MPEG-4 CELP
1905:MPEG-4 HVXC
1820:compression
1652:Apple Video
1568:and AOMedia
1518:H.266 / VVC
1508:H.264 / AVC
1350:compression
1335:compression
1207:FFmpeg-user
1049:PC Magazine
988:PC Magazine
901:www.loc.gov
876:How-To Geek
793:December 6,
608:Limitations
370:Free format
357:Open format
16:File format
3154:Categories
3142:for codecs
3089:Daubechies
3064:Transforms
2966:Arithmetic
2633:Containers
2338:True Audio
2182:(GY/T 363)
1900:MPEG-4 DST
1895:MPEG-4 SLS
1890:MPEG-4 ALS
1764:SheerVideo
1738:QuickTime
1566:TrueMotion
1332:Multimedia
750:References
317:1992-11-10
292:public.avi
169:newspapers
51:improve it
2891:RealMedia
2493:JPEG 2000
2296:RealAudio
2276:OptimFROG
1754:RealVideo
1742:Animation
1712:OMS Video
1339:container
1108:1742-2876
1017:InfoWorld
625:time code
515:megabytes
511:Super VGA
464:streaming
448:Microsoft
301:Microsoft
278:Type code
267:video/avi
108:June 2014
92:summarize
57:talk page
3010:Lossless
2976:Modified
2869:Matroska
2748:Matroska
2659:MPEG-PES
2271:Musepack
2168:AVS1 P10
1747:Graphics
1697:Lagarith
1243:Avidemux
1147:Syngress
1090:Elsevier
840:Springer
733:See also
722:FireWire
665:Matroska
598:metadata
588:Metadata
3084:Wavelet
3025:DEFLATE
2971:Huffman
2961:Entropy
2953:Methods
2938:MPEG LA
2827:Smacker
2715:H.222.0
2671:MPEG-TS
2666:MPEG-PS
2654:MPEG-ES
2538:TIFF/IT
2533:TIFF/EP
2518:JPEG XT
2513:JPEG XS
2508:JPEG XR
2503:JPEG XL
2498:JPEG-LS
2379:aptX HD
2359:WavPack
2301:RTAudio
2241:Codec 2
2174:AVS2 P3
2101:GSM-EFR
2071:AMR-WB+
2005:G.729.1
1985:G.723.1
1975:G.722.2
1970:G.722.1
1769:Smacker
1759:RTVideo
1687:Huffyuv
1667:Cinepak
1627:AVS2 P2
1341:formats
636:B-frame
556:offsets
499:CD-ROMs
493:History
475:AVI 2.0
444:Windows
381:Website
315: (
183:scholar
26:(album)
2886:RatDVD
2780:Others
2547:Others
2349:VMR-WB
2344:TwinVQ
2209:Others
2096:GSM-FR
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