DivX (DivX Video)
The codec that made high-quality video fit on a CD and sparked a digital video revolution in the early 2000s.
| Full name | DivX Video |
| Extension | .divx |
| MIME type | video/x-divx |
| Developer | DivX, LLC (formerly DivXNetworks, Inc.) |
| Released | 2001 (OpenDivX); DivX 4.0 released August 22, 2001 |
| Type | Video codec / container format |
| Based on | MPEG-4 Part 2 video compression |
| Container | Extended AVI (RIFF-based) |
What is a DivX file?
DivX is a video codec and associated file format built on MPEG-4 compression. Files using the .divx extension store video encoded with DivX technology inside an extended AVI container. The format was widely used in the early 2000s for distributing high-quality video at small file sizes.
A .divx file pairs MPEG-4-based video with an audio stream inside a RIFF container derived from AVI. The codec applies strong compression while keeping visible quality high, which made it practical to fit a full movie onto a standard CD. Beyond video and audio, the container supports embedded subtitles (XSUB), chapter markers, and metadata tags (XTAG). The result is a self-contained file that most media players and standalone DVD players with DivX certification can play without extra software.
History
DivX traces back to French engineer Jerome Rota (online alias Gej), who reverse-engineered Microsoft's MPEG-4 codec and released a hacked version informally called 'DivX ;-)' in 1998. In early 2000, entrepreneur Jordan Greenhall recruited Rota to co-found DivXNetworks, Inc. in San Diego, California, and build a clean-room replacement. The company released OpenDivX as open source on January 15, 2001, followed by the commercial DivX 4.0 on August 22, 2001. The company was later renamed DivX, Inc. in 2005 and is now known as DivX, LLC.
Container vs codec
DivX files use an extended version of the AVI (Audio Video Interleave) container, which organizes data as RIFF chunks. Video frames encoded with the DivX MPEG-4 codec are interleaved with audio samples so a player can stay synchronized without loading the entire file first. The format supports multiple audio tracks and optional subtitle streams stored alongside the main content. Metadata such as chapter points and title information sits in additional RIFF headers rather than a separate sidecar file.
What it is used for
- Watching DivX-certified movies on standalone DVD and Blu-ray players
- Storing personal video collections compressed to a manageable size
- Archiving older downloaded or ripped video content from the early 2000s era
- Converting legacy .divx files to modern formats like MP4 for playback on current devices
How to open it
Most media players including VLC, MPC-HC, and Kodi play .divx files without extra plugins because they include the necessary codec. Windows Media Player and macOS QuickTime may require installing the official DivX player or codec pack.
Pros and cons
Strengths
- Strong compression keeps file sizes small while preserving good visual quality
- Wide hardware support: many DVD and Blu-ray players carry DivX certification
- Supports embedded subtitles, chapters, and metadata in a single file
- Long track record means the format is well understood by playback software
Trade-offs
- Older MPEG-4 Part 2 codec is less efficient than modern H.264 or H.265
- The .divx extension is less universally recognized than .avi or .mp4
- Limited support on mobile devices and current streaming platforms
- New content is rarely distributed in this format, making it largely a legacy choice
Convert DivX files
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DivX FAQ
Is DivX the same as AVI?
Not exactly. AVI is the container format, while DivX is the video codec compressed inside it. A .divx file is essentially an extended AVI file that uses DivX MPEG-4 compression for its video stream.
Can I play a .divx file on a regular DVD player?
Only if the player carries DivX certification, which many mid-2000s and later disc players do. Look for the DivX logo on the device or its documentation.
Is DivX the same as DIVX (Digital Video Express)?
No. DIVX (all caps) was an unrelated Circuit City disc-rental scheme from 1998 that failed and shut down in 1999. DivX the video codec has no connection to it beyond a similar name.
Should I convert my old .divx files to MP4?
Yes, if you want reliable playback on modern phones, tablets, and streaming apps. Converting to H.264 MP4 gives you broader compatibility and similar or better quality at the same file size.