M2TS to AVI Converter
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Supports: M2TS
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Need help?Convert M2TS to AVI Online
M2TS is the BDAV MPEG-2 transport stream that AVCHD camcorders and Blu-ray Discs wrap their high-definition H.264 video in; AVI is Microsoft's much older RIFF container from 1992. This converter re-encodes an .m2ts (or camcorder-named .mts) clip into an AVI that VirtualDub-era Windows editors and legacy players can open. It is a deliberately backwards step — useful for old toolchains, but if you just want a modern, smaller, widely-playable file, convert to MP4 instead.
How to Convert M2TS to AVI
- Upload Your M2TS File: Drag and drop your
.m2tsor.mtsclip onto the page or click "+ Add Files". Add several clips to convert them in one batch with the same settings. - Choose the Video Codec: Open Advanced Options. AVI output defaults to the MPEG-4 (Part 2) video codec with MP3 audio — the combination old AVI-era software expects. Xvid and DivX are also offered if a specific legacy editor or player needs them.
- Set Resolution, Trim, or Quality Preset (Optional): Use the Preset dropdown (defaults to Very High), drop the Video resolution with a preset like 720p to shrink the file, or set a Time Range under Trim to keep only part of the clip.
- Convert and Download: Click "Convert" and download your AVI. No sign-up, no watermark.
M2TS vs AVI — What Changes in the Conversion
| Property | M2TS (source) | AVI (output here) |
|---|---|---|
| Container | BDAV MPEG-2 Transport Stream | Microsoft RIFF (AVI), 1992 |
| Extensions | .m2ts (Blu-ray/computer), .mts (camcorder) |
.avi |
| Typical video codec | H.264/AVC (AVCHD and most Blu-ray) | MPEG-4 Part 2 (default), or Xvid/DivX |
| Typical audio | Dolby Digital (AC-3) or Linear PCM | MP3 (default) |
| Codec step | — | H.264 → MPEG-4 Part 2: a less efficient codec |
| Stream copy possible? | — | No — AVI can't cleanly carry H.264 B-frames, so a re-encode is forced |
| Size at equal quality | Baseline | Larger (older codec, looser container) |
| Best for | HD capture and disc playback | Feeding legacy Windows editors and old players |
Frequently Asked Questions
Will I lose quality converting M2TS to AVI?
Some, yes — this conversion can't be lossless. M2TS almost always holds H.264 video, and AVI cannot cleanly carry H.264 (the format predates it and was never designed for codecs that use B-frames), so the video must be fully re-encoded to MPEG-4 Part 2 rather than stream-copied. That is one lossy generation on top of whatever the camcorder or disc already encoded. To keep it visually close, leave the Preset on Very High and don't shrink the resolution. If staying lossless or near-lossless matters more than AVI compatibility, convert to MP4 instead, where the original H.264 stream can be carried with far less loss.
Why is my AVI larger than the original M2TS?
Because you are moving from a newer, more efficient codec to an older one. H.264 (inside the M2TS) packs a given level of quality into fewer bits than MPEG-4 Part 2 or Xvid (the AVI codecs), and AVI itself carries more per-frame overhead than a modern transport stream. To match the source's visual quality the encoder has to spend more bits, so the AVI is usually bigger. If you need a smaller file, either lower the Video resolution preset or convert to MP4, which keeps H.264 and stays compact.
Is .m2ts the same as .mts?
Yes. They are the identical BDAV transport stream — the camcorder spelling (.mts) just follows an older 8.3 filename convention, and the same clip becomes .m2ts once copied to a computer. Both convert identically here. If your file is named with the camcorder extension, the MTS to AVI converter is the same tool pointed at that spelling.
Can I convert M2TS files ripped from a commercial Blu-ray?
Only if they are not copy-protected. Commercial pre-recorded Blu-ray discs are almost always encrypted with AACS (and sometimes BD+), and those M2TS streams cannot be read or converted while that protection is in place — conversion tools cannot legally bypass it. This converter works on M2TS files you can already open, such as your own AVCHD camcorder footage or unprotected recordings. It cannot decrypt a protected disc.
My AVCHD footage looks combed or jagged after converting — why?
AVCHD camcorders very commonly record interlaced (1080i), and most are set that way out of the box. When interlaced video is shown on a progressive screen without deinterlacing, the two fields appear as comb-like horizontal lines on motion. This is a property of the source recording, not the conversion itself. In our testing, footage shot in a progressive mode (1080p/720p) converts cleanly, while 1080i source benefits from deinterlacing before or during encoding; if your editor has a deinterlace filter, apply it there.
How are my files handled, and is there a size limit?
Your M2TS file is uploaded over an encrypted connection, processed on our servers, and the result is sent back for download. Uploaded files and outputs are deleted automatically a few hours after conversion — no sign-up, no watermark, never shared or made public. The main practical limit is upload size and time: M2TS clips carry full HD video and are large, so a long recording can take a while to upload before conversion starts.