AVI
AVI (Audio Video Interleave) is a video file format, introduced by Microsoft in 1992, that stores video and audio together in a single container. The name means audio and video data are interleaved, or woven together, for smooth playback. AVI is an older format with limited support for modern codecs, streaming and subtitles, so today it is mostly found in legacy archives.
Why it matters
AVI files still appear when companies digitize old training videos, camera footage or archives. They rarely play in browsers or phones, and many hold old codecs. Platforms that accept AVI and convert it can bring that legacy content back into use.
How it works
- AVI uses RIFF, a structure that stores data in labeled chunks inside one file.
- Video and audio data are interleaved, placed in alternating chunks so they play back in sync.
- An index at the end of the file lists where each frame sits.
- Players or converters read the chunks, decode the old codec and output a modern format.
Is AVI better than MP4?
No, for most uses AVI is not better than MP4. AVI is older, files tend to be larger, and it has weak support for modern codecs, subtitles and streaming. MP4 holds modern codecs efficiently and plays almost everywhere. AVI is mainly kept for compatibility with old software and archives.
How do I convert AVI to MP4?
You convert AVI to MP4 by re-encoding the video, usually to H.264 with AAC audio, using a tool such as FFmpeg or a transcoding service. Most AVI files use old codecs such as DivX or Xvid that MP4 players do not support, so simple remuxing rarely works. Check the result for audio sync.
Where it's used
Video platforms, corporate training teams and OTT services digitizing old libraries receive AVI files from camcorders, security cameras and company archives, and convert them to MP4 for modern playback.
By the numbers
- Microsoft introduced AVI in November 1992 as part of its Video for Windows software. (Audio Video Interleave (Wikipedia))
