Free online MTS to OPUS converter

Source format overview

MTS is a video container format commonly used by AVCHD camcorders and some other consumer and prosumer cameras. It usually contains H.264/AVC video with AC-3 or LPCM audio, and it is mainly used for recording high-definition footage directly from a camera to memory cards. MTS files are ideal for editing and archiving camera recordings, but they are not as convenient for audio-only playback or sharing when you only need the sound.

Target format overview

OPUS is a modern, open, highly efficient audio codec designed for speech, music, and streaming. It offers excellent quality at low bitrates, fast encoding/decoding, and broad support in many media players and apps. OPUS is commonly used for voice chat, web audio, podcasts, and compressed music distribution. Converting MTS to OPUS extracts the audio from the video and saves it in a compact format that is much smaller than the original camera file.

How to perform the conversion

The best method is to use a desktop tool such as FFmpeg, which is reliable, fast, and preserves audio quality well. If you prefer a graphical workflow, VLC or Audacity can also be used for extraction and export, but FFmpeg is usually the most direct option.

Using FFmpeg

1. Install FFmpeg on your computer.
2. Open a terminal or command prompt in the folder containing your .mts file.
3. Run a command like ffmpeg -i input.mts -vn -c:a libopus output.opus.
4. The -vn option removes video, and -c:a libopus encodes the audio to OPUS.
5. Check the resulting .opus file in a compatible player.

Using VLC

1. Open VLC and go to Media → Convert / Save.
2. Add the .mts file and choose Convert / Save.
3. Select an audio profile that supports OPUS, if available, or use a custom profile.
4. Choose the destination filename with the .opus extension and start the conversion.

Using 101convert.com

You can also convert the file on 101convert.com for free, without installing any software. Upload the .mts file, choose OPUS as the output format, and download the converted audio when it is ready.

Quality, compatibility, and limitations

MTS to OPUS is an audio extraction and re-encoding process, so the video portion of the original file is discarded. If the source audio is already compressed, converting it again to OPUS may introduce a small quality loss, although OPUS is very efficient and usually sounds excellent at moderate bitrates. For best results, choose a bitrate that matches your needs, such as 96 kbps to 160 kbps for speech or higher for music.

Compatibility is generally good, but OPUS support is not universal in older hardware players. It works well in modern software players, browsers, and communication apps, but some legacy devices may prefer MP3 or AAC instead. Also note that some MTS files contain multiple audio tracks or surround sound; in that case, you may need to select the correct track before conversion.