M2TS to FLAC Converter

M2TS to FLAC Converter

An M2TS file is a BDAV MPEG-2 transport stream — the container Blu-ray Discs and AVCHD camcorders wrap their high-definition video and audio in. This converter discards the video and saves only the audio track as a FLAC file, so you keep the soundtrack of a clip in a lossless, open container. What you actually get back depends on which audio codec was inside the M2TS, which is why the format tables below matter more than usual for this conversion.

M2TS Format at a Glance

The .m2ts and .mts extensions are the same BDAV stream — the camcorder spelling just follows an older 8.3 filename convention, so a .mts clip and a .m2ts clip extract identically here. See the MTS to FLAC converter for the camcorder-named version of this exact tool.

FLAC Format at a Glance

How to Convert M2TS to FLAC

1. Upload Your M2TS File: Drag and drop your .m2ts or .mts clip onto the page or click "+ Add Files". Add several clips to extract their audio in one batch with the same settings.
2. Set the Compression level: Open Advanced Options and use the Compression level slider (1-12). Higher squeezes the file a little smaller and takes longer to encode; every level is lossless, so the slider trades encode time for size, never quality.
3. Adjust Audio Channel and Audio Sample Rate (Optional): Leave Audio Channel and Audio Sample Rate on "Original" to copy the source exactly, or downmix surround to stereo and change the sample rate if your target tool needs it. Use Trim to keep only part of the track.
4. Convert and Download: Click "Convert" and download your FLAC file. No sign-up, no watermark.

Frequently Asked Questions

Which audio codecs can an M2TS file contain?

It depends on the source. A Blu-ray Disc M2TS can carry Dolby Digital (AC-3), DTS, or uncompressed Linear PCM as its mandatory formats, plus optional Dolby Digital Plus, DTS-HD High Resolution, DTS-HD Master Audio, or Dolby TrueHD. An AVCHD camcorder M2TS is more restricted — it uses Dolby Digital (AC-3) or LPCM only. This converter reads the audio stream present and re-encodes it to FLAC; support for the exotic lossless Blu-ray formats (TrueHD, DTS-HD Master Audio) can vary, so check the result if your source uses one of those.

Does converting M2TS audio to FLAC improve the sound quality?

No, and whether you keep full fidelity depends on the source codec. If the audio was lossy to begin with — Dolby Digital (AC-3), DTS, or Dolby Digital Plus — FLAC stores a perfect copy of that stream as it exists now, but it cannot rebuild detail the lossy codec already discarded. If the source was uncompressed Linear PCM (or a lossless track like Dolby TrueHD), the FLAC is a genuine lossless transfer of already-lossless audio. Either way, FLAC's value here is a clean, open archival container, not a quality upgrade.

Can I convert the M2TS files from a commercial Blu-ray movie?

Only if they are not copy-protected. Commercial pre-recorded Blu-ray discs are almost always encrypted with AACS (and sometimes BD+), and the 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 disc recordings. It cannot decrypt a protected Blu-ray.

Why extract FLAC instead of just keeping the M2TS file?

A FLAC file is a standalone audio file you can drop into a DAW, music library, or editing timeline without dragging along the H.264 or VC-1 video. It's also a sensible archival format: lossless, non-proprietary, patent-unencumbered, and open-source per the Xiph.Org FLAC project, so it isn't tied to a proprietary codec license the way the original Dolby or DTS audio is.

What happened to the video — can I keep the picture?

This tool extracts audio only; the video stream is intentionally dropped. To keep the picture and just modernize the container, use the M2TS to MP4 converter, which re-wraps the whole clip into a widely supported file. If you only need a small, shareable audio file rather than a lossless one, the M2TS to MP3 converter produces a much smaller result.

How much smaller is the FLAC than an uncompressed copy?

FLAC typically compresses audio to roughly 50-70% of the equivalent uncompressed WAV, depending on the content — quiet or simple passages compress more, dense recordings less. In our testing, a 60-second clip with stereo 48 kHz audio produced a FLAC around half the size of the same track saved as WAV, with no change to the audio itself. The Compression level slider only affects this size, never the fidelity.

How are my files handled, and how long are they kept?

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.