AV1 to M2TS Converter

AV1 to M2TS — Which Format Do You Actually Need?

M2TS is the BDAV transport-stream file used by Blu-ray discs and AVCHD camcorders; AV1 is a 2018 streaming codec that no disc format has ever accepted. So this is not a rewrap — the picture is decoded and re-encoded into something a disc-authoring workflow understands. The short answer: convert to M2TS only when you are feeding an AVCHD or Blu-ray authoring tool, and if you are, change the audio codec to AC3 before you convert. For playback on anything else, AV1 to MP4 is smaller and better supported.

AV1 vs M2TS Side by Side

What the AVCHD Specification Allows

If the M2TS is heading for AVCHD or disc authoring, the format specification — not the converter — sets the rules. These are the values the official AVCHD format lists:

That last row is the one that catches people. This page defaults Audio Codec to AAC, which plays fine on a computer but is not an AVCHD audio format, so authoring software and disc players may reject the file. Switching to AC3 puts you inside the specification.

When M2TS Is the Right Target — and When It Isn't

• Right: you are importing into AVCHD or Blu-ray authoring software (multiAVCHD, tsMuxeR, and similar) that expects a conforming transport stream.
• Right: a camcorder-based editing workflow or an older media player insists on .m2ts and nothing else.
• Wrong: you want to watch the clip on a phone, laptop, or smart TV — those want MP4, which is smaller and universally supported.
• Wrong: you want to keep AV1's efficiency. Nothing in the M2TS toolchain decodes AV1, so the re-encode to H.264 costs you file size for the same picture.
• Worth knowing: a lone .m2ts is not a finished disc. Blu-ray and AVCHD playback needs the full BDMV or AVCHD folder structure, which authoring software builds around the stream you export here.

How to Convert AV1 to M2TS

1. Upload Your AV1 File: Drag and drop your .av1 file, or click "+ Add Files" to browse. Several clips can be queued and converted with identical settings.
2. Set the Audio Codec to AC3: Audio Codec defaults to AAC; change it to AC3 for anything disc-bound, since AVCHD lists Dolby Digital and Linear PCM but not AAC. The dropdown also offers DTS (DCA), EAC3, MP2, and MP3.
3. Check the Video Codec, Quality, and Resolution: Video Codec defaults to H.264, which is what the AVCHD specification names — the dropdown also lists H.265, MPEG-2, MPEG-4, MPEG-1, DivX, and Xvid. File Compression starts on Quality Preset → Very High (Recommended), and Video resolution on Keep original.
4. Convert and Download: Click Convert and save your .m2ts. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — no sign-up, no watermark, never shared or made public.

Frequently Asked Questions

Will the output play on a Blu-ray player or an AVCHD camcorder?

The stream will be in the right shape, but a bare .m2ts file is not a disc. Blu-ray and AVCHD playback requires the surrounding BDMV or AVCHD folder structure — playlists, clip information files, index — which authoring software such as multiAVCHD or tsMuxeR generates. Export a conforming stream here (H.264 video, AC3 audio), then let the authoring tool build the structure around it. Camcorders themselves generally will not play back an arbitrary file you copy onto the card.

Why do I need to change the audio to AC3?

Because AVCHD's audio list has two entries and AAC is not one of them. The format specification allows Dolby Digital (AC-3) at 64-640 kbps for up to 5.1 channels, or Linear PCM at 1.5 Mbps for stereo and up to 7.1 channels. This page defaults to AAC, which is the sensible default for general-purpose files but will get your stream rejected by strict authoring tools and players. Set Audio Codec to AC3 and the file lands inside the specification.

What is the difference between M2TS, MTS, and TS?

They are the same family of MPEG-2 transport stream with different naming conventions. AVCHD camcorders typically write .MTS files on the card, while the same material inside a disc-style folder structure is named .M2TS. A plain .TS is the broadcast-style transport stream without BDAV's extra 4-byte timestamp ahead of each 188-byte packet. If your tool asks specifically for one of the others, use AV1 to MTS or AV1 to TS instead of renaming a file.

Does converting AV1 to M2TS reduce quality?

Yes, unavoidably. There is no way to copy AV1 into a transport stream, because no disc format carries AV1 — the video is decoded and re-encoded into H.264 (or whichever codec you select), which is a second lossy generation on top of the AV1 encode. Keeping Quality Preset on Very High (Recommended) and Video resolution on Keep original keeps that second generation as close to invisible as it gets. Expect the file to grow, too: H.264 needs more bits than AV1 for the same picture.

Can I turn a standard-definition source into real HD?

No. Preset Resolutions and Width x Height can enlarge the frame to 1080p, but upscaling interpolates existing pixels — it cannot recover detail that was never recorded. The result is a larger file that looks softer than the original at its native size. If an authoring tool requires a specific frame size, upscale for compliance; otherwise convert at the source resolution.

Which video codec should I choose for the M2TS?

Leave it on H.264 for anything disc-bound: the AVCHD specification names MPEG-4 AVC/H.264, and that is what authoring tools and players expect. MPEG-2 exists for older workflows that predate AVC, at a significant size penalty. H.265 is available and produces a smaller file, but it is not part of the AVCHD specification, so treat it as a choice for software playback rather than disc authoring. DivX, Xvid, MPEG-4, and MPEG-1 are there for completeness and are not appropriate targets for a transport stream headed to a disc.

Will the M2TS have sound?

Only if there is audio in the source. A bare .av1 file is a raw AV1 video bitstream and carries no audio track, so the resulting .m2ts will be silent no matter which audio codec is selected — and for AVCHD authoring, a stream with no audio track is usually rejected outright. AV1 files exported from XConvert are the exception: they are wrapped in a Matroska container and keep their audio despite the .av1 name, and that track is re-encoded into the transport stream.

How are my files handled during conversion?

Your file is uploaded over an encrypted connection, re-encoded on our servers, and deleted automatically a few hours later — never shared, never made public, with no sign-up and no watermark. The practical limit on a long clip is upload size and time rather than anything on your end; Trim → Time Range lets you export just the segment you need instead of processing the whole file. To go the other direction, see M2TS to MP4.