MTS to M4A Converter
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Supports: MTS
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Need help?Extract Audio from MTS to M4A Online
MTS is the AVCHD recording format from Sony and Panasonic camcorders — H.264 video paired with Dolby Digital (AC-3) or LPCM audio. This tool pulls the audio track out of that recording and saves it as an M4A (AAC) file you can play on iPhone, in iTunes, or anywhere AAC is supported. The video is discarded — the result is audio only — which is what you want for lifting a concert recording, an interview, or ambient sound off camcorder footage.
How to Convert MTS to M4A
- Upload Your MTS File: Drag and drop your
.mtsclip onto the page or click "+ Add Files". Several files queue and convert with the same settings. - Set the Quality Preset: Pick a Quality Preset (or switch to Custom Bitrate). For voice and interviews 96–128 kbps is plenty; for music aim for 192–256 kbps to keep the AAC re-encode transparent.
- Adjust Audio Channel, Sample Rate, or Trim (optional): Leave Audio Channel and Audio Sample Rate on "Original" to match the source, downmix to mono to shrink a voice file, or use Trim to keep just the part you need.
- Convert and Download: Click "Convert" and download your M4A. No sign-up, no watermark.
MTS vs M4A — What Changes
| Property | MTS (source) | M4A (output) |
|---|---|---|
| Contains | H.264 video + audio | Audio only (video discarded) |
| Audio codec | Dolby Digital AC-3 or LPCM | AAC |
| Container | MPEG-2 transport stream | MP4 (MPEG-4) |
| Typical use | Camcorder master file | Phone, iTunes, podcasts, music apps |
| File size | Large (carries video) | Small (audio track only) |
| Quality note | Original camera audio | Lossy re-encode of the source track |
Frequently Asked Questions
Does converting MTS to M4A keep the video?
No. M4A is an audio-only container, so the H.264 video in your MTS file is dropped and only the soundtrack is saved. If you want to keep the picture, convert to a video format with MTS to MP4 instead.
Will I lose quality extracting AAC audio from an MTS file?
MTS audio is usually Dolby Digital AC-3 (already lossy) or LPCM (lossless). M4A uses AAC, so the result is a re-encode. Going from AC-3 to AAC adds a small amount of generational loss; from LPCM it's a lossless-to-lossy step. In our testing, a stereo AVCHD clip extracted at a 256 kbps AAC preset was indistinguishable from the source in normal listening — the loss only matters if you re-edit and re-export many times.
What bitrate should I choose for the M4A?
Match the bitrate to the content. Spoken-word recordings (interviews, lectures, voice memos) sound clean at 96–128 kbps. Music, concerts, and anything with wide dynamics benefit from 192–256 kbps. There's little reason to exceed 256 kbps for AAC — the gains are inaudible and the file just gets larger.
Should I pick M4A or MP3 for camcorder audio?
M4A (AAC) gives slightly better quality than MP3 at the same bitrate and is the native choice for Apple devices and iTunes. MP3 is the safer pick if you need playback on very old hardware. If you'd rather have an MP3, use MTS to MP3; the steps are identical.
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 M4A you get back is small.