Convert Audio Video Interleave (.avi) to Adaptive Multi-Rate Audio (.amr) online for free. Fast, secure video conversion with no watermarks or registration.
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AVI is Microsoft's general-purpose video container capable of holding video and audio in a wide variety of codecs. AMR (Adaptive Multi-Rate) is a specialized narrowband speech codec standardized by ETSI/3GPP, operating at bitrates between 4.75 and 12.2 kbps. AMR was designed for GSM cellular voice transmission and is optimized exclusively for human speech — it performs remarkably well on voice content but produces poor results with music or complex audio. Converting AVI to AMR extracts the audio track and encodes it for mobile voice applications.
AMR is the standard audio format for voice memos on many Nokia, Samsung, and legacy Android phones. If you have AVI recordings of meetings, interviews, or lectures and need to create the smallest possible voice files for MMS, voice memo apps, or VoIP systems, AMR is the format that achieves the most extreme compression while keeping speech intelligible. At 12.2 kbps, a one-hour recording takes under 6 MB.
FFmpeg decodes the AVI audio stream to raw PCM, resamples it to 8 kHz mono (the AMR-NB requirement), and encodes using the libopencore_amrnb encoder at the selected bitrate (4.75–12.2 kbps). AMR-NB operates on 20ms frames with algebraic CELP coding, analyzing speech patterns to achieve extreme compression. The codec applies voice activity detection (VAD) and comfort noise generation (CNG) to further reduce bandwidth during silence periods.
AMR-NB at 12.2 kbps delivers clear, intelligible speech comparable to a standard phone call. Lower bitrates (4.75–7.4 kbps) produce noticeably degraded but still understandable speech. Music, sound effects, and non-speech audio will sound heavily distorted regardless of bitrate — AMR is designed exclusively for voice.
| Device | AVI | AMR |
|---|---|---|
| Windows PC | Native | 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
AVI to AMR conversion is a specialized operation for voice-only use cases. When you need the absolute smallest audio files with intelligible speech, AMR delivers unmatched compression efficiency.
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Конфиденциальность прежде всего
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Работает везде
| No |
8MB free, 50MB Nitro
Любой браузер, любое устройство
| Характеристика | AVI | AMR |
|---|---|---|
| Полное название | Audio Video Interleave | Adaptive Multi-Rate Audio |
| Расширение | .avi | .amr |
| Лучше всего подходит для | Windows native | Speech optimized |