Convert QuickTime Movie (.mov) to Adaptive Multi-Rate Audio (.amr) online for free. Fast, secure video conversion with no watermarks or registration.
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MOV files from Apple devices store high-quality audio (typically AAC at 128-256 kbps stereo) alongside video. AMR (Adaptive Multi-Rate) is a narrowband speech codec developed by Ericsson for GSM cellular networks, encoding voice at 4.75-12.2 kbps mono at 8 kHz sample rate. It was the standard voice format for 2G/3G telephony worldwide.
AMR's extremely low bitrate makes it ideal for voice content that needs to be as small as possible — voice notes, dictation, and telephony applications. A 1-minute voice recording in AMR is roughly 100 KB compared to 1-2 MB for the same content in AAC. This matters for MMS messaging, low-bandwidth networks, and embedded systems with minimal storage.
Some voicemail systems and legacy PBX platforms still require AMR input, making this conversion relevant for business telephony workflows.
FFmpeg extracts the audio track from the MOV container, decodes AAC/ALAC to PCM, downmixes to mono, resamples to 8 kHz, and encodes to AMR-NB using the libopencore-amrnb encoder. The output uses the standard AMR file format with the #!AMR\n magic header. The encoder operates at one of eight discrete bitrates from 4.75 to 12.2 kbps, selectable per frame based on voice activity detection.
AMR is a speech codec — it sounds acceptable for voice but poor for music. The 8 kHz sample rate limits frequency response to 300-3400 Hz (telephone bandwidth). Stereo information from the MOV is discarded. The result is comparable to a phone call in sound quality. For better narrowband quality, AMR-WB (16 kHz) can be requested if supported.
| Device | MOV | AMR |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Native | Partial |
| iPhone/iPad | Native | 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
MOV to AMR conversion trades audio quality for extreme compression, producing voice-optimized files ideal for telephony and low-bandwidth messaging applications.
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| No |
| 기능 | MOV | AMR |
|---|---|---|
| 전체 이름 | Apple QuickTime Movie | Adaptive Multi-Rate Audio |
| 확장자 | .mov | .amr |
| 최적 용도 | High quality | Speech optimized |