Convert MTS to AAC — Free Online Converter
Convert AVCHD Video (.mts) to Advanced Audio Coding (.aac) online for free. Fast, secure video conversion with no watermarks or registration....
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Upload your .mts file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .aac file when it's ready.
About MTS to AAC Conversion
MTS (AVCHD) camcorder files contain high-quality audio recorded as Dolby AC3 (5.1 surround at 256-640 kbps) or 16-bit LPCM (uncompressed stereo at 1536 kbps). AAC (Advanced Audio Coding) is the modern successor to MP3, delivering transparent audio quality at 128-256 kbps. Converting MTS to AAC extracts the camcorder's audio track and re-encodes it into the most widely supported lossy audio format.
Why Convert MTS to AAC?
Camcorder audio often captures valuable content — wedding vows, live performances, conference speeches, natural soundscapes — that deserves extraction and preservation independently from the video. AAC is the ideal target because it provides the best quality-to-size ratio of any lossy codec, with native playback support on every modern device and streaming platform.
AVCHD audio tracks are stored as AC3 (Dolby Digital) or LPCM inside the MPEG-2 Transport Stream container. Neither format is practical for standalone audio distribution — AC3 files are uncommon on mobile devices, and LPCM is enormous. AAC gives you compact, universally playable audio from your camcorder recordings.
Common Use Cases
- Extracting wedding ceremony audio from AVCHD camcorder recordings
- Pulling speech audio from conference/event recordings for podcast distribution
- Creating standalone music files from live performance camcorder footage
- Building audio archives from family camcorder recordings
- Isolating nature sounds and ambient audio captured by HD camcorders
How It Works
FFmpeg strips the H.264 video stream and transcodes the AC3 or LPCM audio to AAC: `-vn -c:a aac -b:a 256k -ar 48000 -ac 2`. If the source is 5.1 AC3, add `-ac 2` to downmix to stereo, or `-af pan=stereo|FL=FC+0.707*FL+0.707*BL|FR=FC+0.707*FR+0.707*BR` for a cinematic downmix. AVCHD audio is natively 48 kHz, so match that sample rate.
Quality & Performance
If the MTS source has LPCM audio (uncompressed), converting to AAC at 256 kbps produces near-transparent results with minimal audible loss. If the source is AC3, the transcoding from one lossy codec to another introduces a small generational loss, but at 256 kbps AAC it remains imperceptible for most content.
Device Compatibility
| Device | MTS | AAC |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No | No |
Recommended Settings by Platform
YouTube
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
TikTok
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Twitter/X
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Discord
Resolution: 1280x720
Bitrate: 4 Mbps
8MB free, 50MB Nitro
Tips for Best Results
- 1Match the output sample rate to 48 kHz — AVCHD audio is natively 48 kHz, and resampling to 44.1 kHz adds unnecessary conversion
- 2Apply a high-pass filter at 80 Hz to remove low-frequency camera handling noise and wind rumble
- 3Use the proper 5.1-to-stereo downmix matrix to preserve center channel dialog clarity when converting surround audio
- 4Normalize audio levels after extraction — camcorder recordings often have inconsistent volume levels
- 5Add metadata tags (date, event name, location) to keep extracted audio organized in your library
Related Conversions
MTS to AAC extraction isolates high-quality camcorder audio into a compact, universally compatible format, preserving speeches, performances, and ambient recordings for standalone playback.