CONVERT MTS → AVI (MTS to AVI)
Fast, secure MTS to AVI conversion. No registration required.
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HOW TO CONVERT MTS → AVI
Provide the MTS 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.
Setup: MTS is the AVCHD camcorder variant of the MPEG transport stream. Goal: an interchangeable AVI. Turn your MTS video into a AVI the rest of the world can play. The codecs inside may be the same; just the container changes. That alone is enough to fix most "upload failed" and "cannot play this file" errors, and it happens in seconds with no quality loss when stream copy applies. Keep in mind MTS is the AVCHD camcorder variant of the MPEG transport stream. And remember that AVI is the legacy Microsoft Audio Video Interleave container from the 1990s.
Why convert MTS to AVI
The usual reason to convert from MTS into AVI is the same reason anyone transcodes video: the original container is not accepted where you are trying to send the file. Swapping to AVI flips that rejection into a clean upload without altering the footage itself.
MTS vs AVI — Technical specifications
Side-by-side comparison of the technical details.
MTS
- MIME type
- video/mp2t
- Extension
- .mts
- Container
- BDAV MPEG-2 Transport Stream (192-byte packets)
- Video codecs
- H.264 (AVCHD Main/High Profile)
- Audio codecs
- AC-3 (Dolby Digital), LPCM
AVI
- MIME type
- video/x-msvideo
- Extension
- .avi
- Container
- RIFF
- Max file size
- 2 GB (original); 4 GB (OpenDML extension)
- Codec support
- Any codec via FourCC identifiers
| Specification | MTS | AVI |
|---|---|---|
| MIME type | video/mp2t | video/x-msvideo |
| Extension | .mts | .avi |
| Container | BDAV MPEG-2 Transport Stream (192-byte packets) | RIFF |
| Video codecs | H.264 (AVCHD Main/High Profile) | — |
| Audio codecs | AC-3 (Dolby Digital), LPCM | — |
| Max file size | — | 2 GB (original); 4 GB (OpenDML extension) |
| Codec support | — | Any codec via FourCC identifiers |
MTS vs AVI — Strengths and limitations
What each format does best, and where it falls short.
MTS Strengths
- Native format for every AVCHD camcorder since 2006.
- H.264 compression — small files for high-def quality.
- Direct compatibility with iMovie, Premiere, Resolve, Final Cut.
- Carries Dolby Digital 5.1 audio on flagship camcorders.
Limitations
- Slow to decode — editors typically transcode for editing.
- Proprietary folder-structure conventions complicate direct import.
- Largely legacy as smartphones replaced dedicated camcorders.
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 conversion does not upscale or sharpen the video. A 1080p MTS produces a 1080p AVI; a 4K source stays 4K unless you select a lower output resolution explicitly. Picking higher bitrates does not improve perceived quality beyond the source ceiling.
Tips for Best Results
- If your MTS has variable frame rate, force a constant frame rate in AVI to avoid stuttering on some players and streaming platforms.
- For screen recordings at high resolution, quality 22 CRF H.264 keeps text perfectly readable at a fraction of the source size.
- Check the audio track after transcoding — some MTS containers carry unusual audio codecs that downgrade subtly when remapped to AVI.
Frequently Asked Questions
Only when it has to. If the codecs inside MTS (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".
AVCHD Video
Source formatMTS (AVCHD) is a high-definition video format from Sony and Panasonic camcorders.
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.
Common Use Cases
Share across platforms
Send AVI files to anyone without worrying about whether they have the right software for MTS.
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 MTS 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.
MTS vs AVI — Typical file sizes
Approximate file sizes for common scenarios.
- 1 min HD AVCHD (17 Mbps) ~130 MB
- 1 hour AVCHD Full HD ~8 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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