Convert AVCHD Video (.mts) to Adaptive Multi-Rate Audio (.amr) online for free. Fast, secure video conversion with no watermarks or registration.
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MTS/AVCHD files from HD camcorders contain audio at quality levels far exceeding what the AMR (Adaptive Multi-Rate) codec can represent. AMR operates at 4.75-12.2 kbps in narrowband (8 kHz) mode, designed exclusively for human speech in cellular telephony. Converting MTS to AMR extracts only the voice content from camcorder recordings, discarding all musical and environmental audio fidelity.
The only practical reason to convert HD camcorder audio to AMR is when you need to extract speech for distribution over extremely bandwidth-constrained channels — MMS messages, 2G cellular data, or IVR/voicemail systems. If a camcorder recorded an interview, testimony, or verbal message that needs to be transmitted via mobile messaging in a low-connectivity environment, AMR delivers intelligible speech at file sizes 500-1000x smaller than the source audio.
Telecommunications systems and some legal/forensic workflows also require AMR input for voice analysis and archiving. Converting the camcorder's high-quality AC3 or LPCM audio to AMR strips everything except the speech band (300-3400 Hz), resulting in voice-only files suitable for these specialized applications.
FFmpeg discards the video, decodes AC3/LPCM audio, downmixes to mono, and encodes via libopencore_amrnb: `-vn -ac 1 -ar 8000 -c:a libopencore_amrnb -b:a 12.2k`. The downmix from stereo/surround to mono and the dramatic sample rate reduction (48000 → 8000 Hz) are handled in a single FFmpeg pipeline. A high-pass filter at 300 Hz can be applied to remove non-speech frequencies before encoding.
AMR at 12.2 kbps captures only the 300-3400 Hz speech band — about 4% of the 48 kHz AVCHD audio bandwidth. All music, ambient sound, and high-frequency content is eliminated. Speech remains clear and intelligible, but the output sounds distinctly telephonic. This conversion is appropriate only when speech extraction is the explicit goal.
| Device | MTS | AMR |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Resolution: 1280x720
Bitrate: 4 Mbps
8MB free, 50MB Nitro
MTS to AMR conversion is a highly specialized extraction for voice-only content, producing the smallest possible audio files from high-quality camcorder recordings while maintaining speech intelligibility.
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| No |
| الميزة | MTS | AMR |
|---|---|---|
| الاسم الكامل | AVCHD Video | Adaptive Multi-Rate Audio |
| الامتداد | .mts | .amr |
| الأفضل لـ | HD camcorders | Speech optimized |