MTS to OPUS Converter

Extract Opus Audio from MTS Online

MTS is the AVCHD recording format introduced by Sony and Panasonic in 2006 — H.264 video alongside a Dolby Digital (AC-3) or LPCM audio track. This tool pulls the audio out of that clip and re-encodes it to Opus, the open IETF codec (RFC 6716) behind Discord, WhatsApp, and WebRTC voice. The video is discarded — you get audio only — and because Opus stays clear at low bitrates, a stretch of dialogue or ambient sound lands at a fraction of the size you'd get from MP3.

How to Convert MTS to Opus

1. Upload Your MTS File: Drag and drop your .mts clip onto the page or click "+ Add Files". Several files queue and convert with the same settings.
2. Set the Quality Preset: Open Advanced Options and pick a Quality Preset (Highest is the default) or switch to Constant, Variable, or Custom Bitrate to name an exact kbps target — 24–48 kbps is plenty for voice, 96–128 kbps is transparent for music.
3. Adjust Audio Channel, Sample Rate, or Trim (optional): Leave Audio Channel and Audio Sample Rate on the source values, downmix to Mono to halve a voice file, or use Trim to keep just the segment you need.
4. Convert and Download: Click "Convert" and download your .opus file. No sign-up, no watermark.

Opus Bitrate Guide for Extracted Camcorder Audio

Frequently Asked Questions

Does converting MTS to Opus keep the video?

No. Opus is an audio-only codec, so the H.264 video in your MTS file is dropped and only the soundtrack is saved as a .opus file. That is exactly what you want for lifting an interview, a concert recording, or ambient sound off AVCHD camcorder footage. If you need to keep the picture, convert to a video format with MTS to MP4 instead.

Will I lose quality extracting Opus from an MTS file?

Yes, a little — this is a re-encode, not a copy. MTS audio is usually Dolby Digital AC-3 (already lossy) or LPCM (lossless). AC-3 to Opus is a lossy-to-lossy step that adds a small amount of generational loss; LPCM to Opus is lossless-to-lossy. Opus is efficient enough that at 96–128 kbps the result is transparent to almost everyone — the loss only matters if you re-edit and re-export many times. For an uncompressed LPCM source you want to preserve, pick a higher bitrate.

Will my Opus file play everywhere?

Not quite. Opus plays natively in Chrome, Firefox, Edge, and Opera, on Android, in apps like VLC and Discord, and in Safari on recent Apple systems. The weak spots are older car stereos, legacy portable players, Apple's Podcasts app (no Opus support as of 2024), and Windows versions before 10 (which need a decoder such as LAV Filters). If you need maximum playback compatibility for camcorder audio, convert MTS to MP3 instead.

What bitrate should I choose for camcorder audio?

Match the bitrate to the content. Spoken-word recordings — interviews, lectures, voice memos — sound clean at 24–48 kbps in Mono, and the files stay tiny. Music, concerts, and anything with wide dynamics are transparent by 96–128 kbps in Stereo. Opus reaches the same ceiling far lower than MP3, so there is no need for MP3-style 320 kbps; the codec ranges from 6 kbps up to 510 kbps, but for extracted audio you rarely need the top end. In our testing, a 60-second stereo AVCHD clip extracted at 96 kbps Opus came out near 0.7 MB.

How are my files handled, and is there a size limit?

Files are uploaded over an encrypted connection, processed on our servers, and 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: AVCHD clips can be large because they carry full HD video, so a long recording may take a while to upload even though the .opus you get back is small. To keep just a section, set a Trim start and duration, or run the result through the Audio Cutter afterward.