M2TS to OGA Converter

Extract the Soundtrack From an M2TS as OGA

An .m2ts file is a Blu-ray-framed MPEG-2 transport stream — the thing AVCHD camcorders record and Blu-ray discs carry. Inside it, H.264 video runs alongside a Dolby Digital (AC-3) or Linear PCM soundtrack, usually at 48 kHz. This page throws the picture away and re-encodes just the audio into an Ogg file.

.oga is the file extension RFC 5334 registers for audio/ogg — the general-purpose name for an audio-only Ogg stream. The narrower .ogg extension is reserved by the same RFC for Ogg files that contain only a Vorbis bitstream, which is why .oga is the correct name when you want the freedom to put Opus or FLAC inside instead.

How to Convert M2TS to OGA

1. Upload Your M2TS File: Drag the .m2ts onto the page or click "+ Add Files". Long camcorder captures are fine, and several clips can be queued and extracted with the same settings.
2. Choose an Audio Codec: Four are offered — Vorbis (preselected), Opus, FLAC and Speex. This is the most consequential choice on the page and the table below explains why. Vorbis is the safe default; Speex is not a general-purpose option.
3. Set File Compression, Channel, Sample Rate or Trim: File Compression opens on Quality Preset; Constant Bitrate (8 to 384 kbps, opening at 128), Custom Bitrate (opening at 128 kbps) and Specific file size (opening at 8 MB) are the alternatives. Audio Channel offers Original, Mono and Stereo, and Audio Sample Rate offers Original plus 8000, 12000, 16000, 24000, 44100 and 48000 Hz. Trim takes a start time and a duration in seconds or HH:MM:SS.sss.
4. Convert and Download: Click "Convert" and save the .oga. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — no sign-up, no watermark.

Choosing the Codec Inside the Ogg

All four measurements below come from the same ten-second 48 kHz stereo AC-3 test bed, extracted through this page's own settings:

Speex deserves the warning. It is a narrow/wide-band speech codec, it caps at 32 kHz, and on this route it does not respond to the File Compression settings at all. We requested 8 kbps, 26 kbps and 44 kbps against the same source and got three files of exactly 959 bytes, each measuring 767 bits per second — every bitrate control collapsed to the same sub-1-kbps result. Ten seconds of stereo music in under a kilobyte is not compression, it is destruction. Use Opus if you need small; it beats Speex at speech too.

How the Quality Preset Maps to Vorbis

Vorbis is a variable-bitrate codec, so on the Quality Preset path the preset is translated into a Vorbis quality number on its native −1 to 10 scale rather than a bitrate. The mapping and our measurements on the same ten-second bed:

Note the bottom row. On difficult broadband material the lowest setting produced a larger file than the two above it, because at quality −1 libvorbis is fighting content it was never tuned for. Treat Very Low as the practical floor and Medium as the sweet spot; if you need a guaranteed size, use Specific file size instead of chasing the preset ladder downwards.

Frequently Asked Questions

What was the audio in my M2TS to begin with?

Almost certainly Dolby Digital (AC-3) at 48 kHz — that is what AVCHD camcorders write, commonly at 256 or 384 kbps, and Blu-ray discs go higher. Some professional camcorders and Blu-ray titles use Linear PCM instead, which is uncompressed. Either way, this conversion decodes it and re-encodes into Ogg; leaving Audio Sample Rate on Original keeps the 48 kHz the source was recorded at.

My camcorder recorded 5.1. What happens to the surround channels?

Vorbis, Opus and FLAC can all carry more than two channels, so leaving Audio Channel on Original preserves what the source had. Choosing Stereo downmixes to two; choosing Mono collapses to one, which roughly halves the file and is the right call for an interview or lecture recording where the surround channels hold nothing useful.

Is .oga the same thing as .ogg?

Not quite, and the difference is written into the standard. RFC 5334 registers .oga for audio/ogg generally, while reserving .ogg for Ogg files that contain only a Vorbis bitstream, for backwards compatibility with older software. So a Vorbis .oga could legitimately be renamed .ogg, but an Opus or FLAC one could not. If a tool insists on .ogg, choose Vorbis here.

Does Trim work on a transport stream?

Yes. We cut a ten-second source with a start of 4 seconds and a duration of 3 and got back a 3.003-second file — transport streams carry timestamps, so seeking into one is accurate. Trim is the right way to pull one song, one answer, or one announcement out of a long camcorder capture without extracting the whole thing first.

I picked FLAC and the file is enormous. Did something go wrong?

No — that is what lossless means. FLAC does not throw information away, so the size is governed by the source material rather than by a quality setting. On our ten-second bed it produced 1,468,962 bytes against 109,727 for mid-quality Vorbis, a factor of thirteen. Note also that this writes FLAC inside an Ogg container, which is a legal but less common arrangement; if you want a plain lossless file that every player recognises, M2TS to FLAC writes a native .flac instead.

Which sample rates actually work with Vorbis?

All of the ones offered. We ran the full list against the same source — 8000, 12000, 16000, 24000, 44100 and 48000 Hz — and every one produced a valid file at exactly the rate requested (40,973 bytes at 8 kHz rising to 109,727 at 48 kHz, at the same quality setting). Dropping the rate is a legitimate way to shrink a speech recording, though halving it costs you the top octave of the audio.

Why choose OGA over MP3?

Vorbis and Opus are both meaningfully better than MP3 at the same bitrate, and Ogg is unencumbered by the licensing history that surrounded MP3 for decades. The counter-argument is compatibility: car stereos, older phones and some TVs play MP3 and nothing else. If the file has to work everywhere without thought, M2TS to MP3 is the pragmatic choice.

The output plays in VLC but not in my music app. Why?

Ogg support is uneven outside desktop players, and it varies by what is inside the Ogg. Vorbis has the broadest reach; Opus is well supported in browsers and modern apps but patchier on older hardware; FLAC-in-Ogg is the least commonly handled of the three. If a specific app is refusing the file, re-convert with Vorbis selected before assuming the file is broken.

Can I set an exact file size?

Yes — Specific file size under File Compression takes a byte budget (it opens at 8 MB) and the encoder solves for a bitrate that fits. That is more reliable than guessing at the preset ladder when you have a hard upload limit to meet. It does mean the quality is whatever fits, so give it as much room as your limit allows.