AVI files: a container from 1992, and what to do with one now
Why old AVI files no longer play, what DivX and Xvid have to do with it, and which conversion actually helps. Convert AVI in your browser, no upload.
At a glance
- Type
- Video
- Container format
- Yes
- Extensions
- .avi
- MIME type
- video/x-msvideo
- Common codecs
- mpeg4, mjpeg, mp3
- Also known as
- Audio Video Interleave
AVI is Microsoft's Audio Video Interleave, introduced in 1992 as part of Video for Windows. It is a simple container — chunks of video and audio alternating through the file — and its simplicity is both why it spread so widely and why it aged so badly. It has no proper support for variable frame rate, no equivalent of the faststart index that lets a file play while downloading, and only rudimentary metadata.
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The files people still have are usually from the DivX and Xvid era: MPEG-4 Part 2 video with MP3 or AC-3 audio, encoded somewhere between 2000 and 2010. Those codecs predate hardware decoding, so phones, tablets and televisions have neither silicon nor, increasingly, software for them. The container is not really the problem — the codec inside is.
That means converting an AVI is a real transcode, not a repack: every frame is decoded and re-encoded to H.264, which takes a noticeable fraction of the video's length and costs a little quality. Worth knowing before you start, because the alternative is often better: if the AVI is a lecture, a screen recording or a concert, extracting just the audio is far faster, produces a much smaller file, and skips the picture quality loss entirely.
Convert AVI to other formats
Convert other formats to AVI
FAQ
Why will nothing play my AVI?
Usually the codec rather than the container. DivX and Xvid predate hardware decoders, so phones and TVs have no support, and software support has been receding for years.
Why does converting an AVI take minutes?
Because it is a genuine re-encode. The codecs inside are not ones MP4 accepts, so every frame must be decoded and compressed again — unlike MOV to MP4, which just copies the streams.
Will the MP4 look better than the AVI?
No. Re-encoding cannot add detail the old codec discarded. What you gain is a file modern devices can decode, usually at a smaller size.
Should I convert the video or just the audio?
If the content is a lecture, screencast or recording where the picture adds little, extract the audio — far faster, much smaller, and no picture quality loss.
Is AVI ever the better format?
Not on technical merit. MP4 handles streaming, variable frame rate and metadata better. Convert to AVI only when specific old software demands it.
My old DVD player wants AVI — will converting work?
Probably not. Those players decode DivX and Xvid, and this converter produces H.264 inside the AVI container. The wrapper will be right and the codec will not.