CONVERT M4V → AVI (M4V to AVI)
Fast, secure M4V to AVI conversion. No registration required.
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HOW TO CONVERT M4V → AVI
Provide the M4V clip
Upload through the browser; transfers are encrypted end-to-end and files are quarantined per session.
Convert to AVI
The conversion keeps resolution, frame rate and bit depth identical to the source unless you explicitly override them.
Save to your device
Click download to pull the AVI to local storage; share the short-lived URL with collaborators if needed.
M4V is Apple's container format, structurally identical to MP4 but optionally protected by FairPlay DRM. When DRM is absent — the common case for personal iTunes library exports, screen recordings made on macOS, and files produced by Handbrake or iMovie — the video stream inside is H.264 (AVC) or H.265 (HEVC) and the audio is typically AAC. The container itself is understood by Apple software first and by everything else only conditionally. AVI, Microsoft's Audio Video Interleave format from 1992, uses a completely different wrapping scheme: RIFF chunks that interleave audio and video blocks at a fixed index offset, with no native support for B-frames beyond a workaround called OpenDML. The reason a user reaches for this conversion in 2024 is almost always a legacy device or software constraint on the receiving end — an older smart TV firmware that parses AVI but not M4V, a Windows XP-era media player, industrial or surveillance software locked to AVI input, or a video editing application from the mid-2000s that predates widespread MP4 support. The conversion on KaijuConverter re-encodes the video to MPEG-4 Part 2 (Xvid/DivX profile) and the audio to MP3, which are the codec choices those legacy environments actually expect inside an AVI wrapper.
Why convert M4V to AVI
The single most common trigger is a legacy playback environment that explicitly requires AVI. Older Samsung, LG, and Sony smart TV firmware from roughly 2009 to 2013 accepted AVI with Xvid video and MP3 audio but rejected MP4 and M4V containers entirely. Some automotive head units, portable DVD players with USB slots, and DVD authoring tools share this constraint. A secondary reason is compatibility with older Windows software: VirtualDub, Avisynth 2.5x filter chains, and certain surveillance NVR export utilities operate on AVI as their native interchange format and cannot open M4V without additional codec packs that many managed environments prohibit.
M4V vs AVI — Technical specifications
Side-by-side comparison of the technical details.
M4V
- MIME types
- video/x-m4v
- Extension
- .m4v
- Container
- MPEG-4 Part 14 (same as MP4)
- DRM
- Apple FairPlay (iTunes Store)
- Codecs
- H.264, HEVC (iTunes 4K)
- MIME Type
- video/x-m4v
- Category
- Video Files
- Full Name
- M4V Video (Apple)
- Conversion Engine
- FFMPEG
AVI
- Extension
- .avi
- Container
- RIFF
- MIME Type
- video/x-msvideo
- Category
- Video Files
- Full Name
- AVI Video
- Conversion Engine
- FFMPEG
- MIME type
- video/x-msvideo
- Max file size
- 2 GB (original); 4 GB (OpenDML extension)
- Codec support
- Any codec via FourCC identifiers
| Specification | M4V | AVI |
|---|---|---|
| MIME types | video/x-m4v | — |
| Extension | .m4v | .avi |
| Container | MPEG-4 Part 14 (same as MP4) | RIFF |
| DRM | Apple FairPlay (iTunes Store) | — |
| Codecs | H.264, HEVC (iTunes 4K) | — |
| MIME Type | video/x-m4v | video/x-msvideo |
| Category | Video Files | Video Files |
| Full Name | M4V Video (Apple) | AVI Video |
| Conversion Engine | FFMPEG | FFMPEG |
| MIME type | — | video/x-msvideo |
| Max file size | — | 2 GB (original); 4 GB (OpenDML extension) |
| Codec support | — | Any codec via FourCC identifiers |
M4V vs AVI — Strengths and limitations
What each format does best, and where it falls short.
M4V Strengths
- Fully MP4-compatible — one-line rename to .mp4 in most workflows.
- First-class support across Apple devices (macOS, iOS, tvOS, HomePod video).
- Supports chapters, closed captions, and multi-language audio tracks.
- Can hold Dolby Vision and HDR10+ metadata.
Limitations
- FairPlay DRM variants tie files to Apple IDs — moves to other ecosystems break playback.
- Extension is not strictly standardized — some tools flag it as unknown.
- Rarely used outside Apple distribution.
AVI Strengths
- Simple, well-documented format — trivial for any video library to parse.
- Universal Windows playback since Video for Windows in 1992.
- Low encoding overhead — interleaved structure is fast to write.
- Works with any codec technically, including modern ones.
Limitations
- Aging container — no native support for chapters, subtitles, or multi-audio selection.
- File-size limits (2 GB original, 4 GB with OpenDML) break for HD content.
- Variable-framerate video causes sync drift.
Quality & Compatibility
The video re-encode from H.264 (the most common codec inside M4V) to MPEG-4 Part 2 is a lossy generation loss — there is no way around this. H.264 at a given bitrate produces measurably sharper results than MPEG-4 Part 2 at the same bitrate; the older codec is less efficient. The audio conversion from AAC to MP3 is also lossy-to-lossy, introducing a second compression artefact layer. Alpha channel transparency is not carried: neither MPEG-4 Part 2 nor standard AVI supports per-pixel alpha, so any transparency in the source is composited to black. HDR metadata and wide-colour (BT.2020) signals are discarded; the output is treated as SDR BT.601 or BT.709. Embedded chapter markers, iTunes metadata fields (artist, album, cover art), and closed-caption tracks present in the M4V are all dropped — AVI has no standardised container fields for these. What does survive is the decoded pixel content (within the quality loss of re-encoding) and the basic timing of the audio/video sync.
Tips for Best Results
- Keep source bitrate expectations realistic: if your M4V was already compressed at low bitrate (under 1500 kbps for 1080p), the AVI output will show visible blocking artefacts because MPEG-4 Part 2 is a less efficient codec and the re-encode compounds any existing compression.
- If the destination is a USB-playback TV or DVD player, confirm it lists Xvid or DivX in its codec specification — some firmware that claims AVI support only handles Motion JPEG or MPEG-1 inside AVI, which is a different output profile entirely.
- Files above 2 GB hit the classic AVI index limit unless the player supports OpenDML (AVI 2.0) extensions; for long recordings consider trimming to segments under 90 minutes at standard definition before converting, or use the paid 2 GB upload tier and split output if your player firmware is pre-2005.
Frequently Asked Questions
Only when it has to. If the codecs inside M4V (usually H.264 or H.265 for video, AAC for audio) are accepted by AVI, we stream-copy — the bytes are repackaged into the new container with zero re-encoding and no quality loss. When the source uses a codec the target does not support, we transcode at a matching bitrate to keep the visual quality close to the original.
With stream copy, expect the job to finish in seconds to tens of seconds regardless of video length — the work is mostly rewriting the container. Transcoding is slower (roughly real-time: a ten-minute clip takes about ten minutes) because every frame must be decoded and re-encoded. The progress bar shows which mode applies.
Yes. Resolution, frame rate, colour space and bit depth are preserved by default; stream copy is literally bit-identical on these parameters. If you explicitly pick a lower bitrate or a different codec in Advanced, the output is rebuilt to those settings, but the default is always "match the source".
M4V Video (Apple)
Source formatM4V is Apple MPEG-4 video format, similar to MP4 but may include DRM.
AVI Video
Target formatAVI is a legacy Microsoft multimedia container that stores audio and video data. While largely superseded by modern formats, it remains widely recognized and is produced by many older devices and screen recorders.
Going the other way? Convert AVI back to M4V with the same engine.
Common Use Cases
Share across platforms
Send AVI files to anyone without worrying about whether they have the right software for M4V.
Embed in documents
Drop AVI output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
AVI often produces smaller files than M4V for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
M4V vs AVI — Typical file sizes
Approximate file sizes for common scenarios.
- 45-min TV episode (iTunes HD) 1.2-2 GB
- 2-hour movie (iTunes HD) 4-6 GB
- 2-hour movie (iTunes 4K Dolby Vision) 15-35 GB
- 10-min video (XviD / MP3) 100-200 MB
- 45-min TV episode (DivX) 350-700 MB
- 2-hour movie (DVD rip) 700 MB - 1.4 GB
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Related comparisons
See these formats side by side to understand which fits your use case best.
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