MTS to AMR Converter

Extract AMR Audio from MTS Online

This pulls the audio out of an .mts (AVCHD camcorder) clip and writes it as .amr, the narrowband telephone codec built for GSM and 3G phones, voicemail boxes, and IVR systems. Be clear about what that costs before you start: this is a double reduction. First the video track is discarded and only the sound is kept; then that camcorder soundtrack — typically 48 kHz Dolby Digital, stereo or surround — is squeezed into AMR-NB, which keeps only the ~200–3,400 Hz telephone band in a single mono channel. Everything above the voice band is thrown away and the channels fold to mono, so the result is meant to sound like a phone call. Pick AMR only when something on the receiving end demands an .amr file. If you just want the audio to play and share, extract MTS to MP3 or MTS to AAC instead, and use MTS to MP4 if you want to keep the picture.

How to Extract AMR Audio from MTS

1. Upload Your MTS File: Drag and drop the .mts clip onto the page, or click "Add Files" to browse. You can queue several at once and convert them with the same settings.
2. Pick the Audio Codec: Open Advanced Options and choose AMR Narrow Band (8 kHz, the classic GSM/voicemail format) or AMR Wide Band (16 kHz, a fuller 50–7,000 Hz voice band) — only choose Wide Band if the receiving system explicitly accepts it.
3. Set the Constant Bitrate (Optional): Leave Quality Preset on its default, or pick a Constant Bitrate from the AMR ladder — AMR-NB runs 4.75 up to 12.2 kbit/s (7.40 kbit/s is labelled "toll quality"). Audio Channel stays Mono and Audio Sample Rate stays 8000 Hz to match the codec; use Trim if you only need part of the clip.
4. Convert and Download: Click "Convert" and download your AMR file. No sign-up, no watermark.

What Happens to the AVCHD Soundtrack

Frequently Asked Questions

Why does the audio sound like a phone call after converting MTS to AMR?

Because AMR is a telephone codec, and this conversion strips away almost everything an AVCHD camcorder recorded. Your .mts clip carries a full-range soundtrack — usually 48 kHz Dolby Digital in stereo or surround. AMR-NB, the 3GPP speech codec that GSM and 3G calls used, samples at just 8 kHz and keeps only the roughly 200–3,400 Hz voice range in a single mono channel. Folding the camcorder track down to AMR-NB discards the highs, the lows, and every channel past the first. That muffled, telephone-quality result is the codec working as designed, not a fault in the extraction.

When should I actually extract MTS to AMR instead of MP3?

Only when something on the receiving end specifically requires an .amr file: feeding speech into a telephony or IVR platform, loading a voice prompt onto old phone firmware or a carrier voicemail system, or producing a test fixture for telecom software that expects AMR input. AMR also makes sense for speech-only clips where the file must be tiny and fidelity does not matter. For anything you want to listen to or share normally, AMR is the wrong target — use MTS to MP3 for a small universal file or MTS to AAC for better quality at the same size.

Should I pick AMR Narrow Band or AMR Wide Band for the extracted audio?

Match whatever the receiving system accepts. AMR-NB (8 kHz, ~200–3,400 Hz) is the classic format for GSM/3G voicemail, MMS voice, and most legacy IVR — the safest bet when you are not sure. AMR-WB (16 kHz, 50–7,000 Hz) carries a noticeably fuller voice and is used by newer HD-voice systems, but older equipment will reject it. Both are mono speech codecs, so neither preserves the camcorder's stereo or surround. When in doubt, choose Narrow Band for the widest compatibility.

Will a higher AMR bitrate recover the camcorder's audio quality?

No — it only sharpens things within the codec's narrow band. Moving from 4.75 to 12.2 kbit/s on AMR-NB improves clarity inside the telephone range, and 7.40 kbit/s is the rate often labelled "toll quality." But no AMR bitrate restores frequencies the codec cannot represent: AMR-NB will never reach beyond ~3,400 Hz no matter how high you set the rate, and it stays mono. Pick a bitrate that satisfies your target system; pushing it higher only enlarges the file without widening the sound. In our testing, a one-minute AVCHD clip extracted to AMR-NB at 12.2 kbit/s produced a file in the low-90s of kilobytes.

How are my files handled, and how long do you keep them?

Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion — no sign-up, no watermark, and your files are never shared or made public. Because only the audio leaves with you, the video track in the original .mts is never part of the download; if you only need a portion of a clip, use the Trim controls so you upload and convert less of it.