AMR vs WMA
Una comparativa detallada de AMR Audio y Windows Media Audio — tamaño de archivo, calidad, compatibilidad y cuál elegir según tu flujo de trabajo.
AMR Audio
Audio FilesAMR (Adaptive Multi-Rate) is an audio format optimized for speech, used in phone calls.
Sobre los archivos AMRWindows Media Audio
Audio FilesWMA is a proprietary Microsoft audio format from the Windows Media framework. Once common in the Windows ecosystem, it has been largely replaced by AAC and MP3 for general use.
Sobre los archivos WMAComparativa de ventajas
AMR Ventajas
- Extremely low bitrate — 4.75-12.2 kbps for speech.
- Designed for error-prone mobile channels — handles packet loss gracefully.
- Tiny file sizes — hours of voice in a few MB.
- Mandatory codec in all 3G/UMTS phones — universal cellular compatibility.
WMA Ventajas
- Good quality at low bitrates (32-64 kbps) — outperformed MP3 in that range.
- Native playback on every Windows version 2000 through 10.
- Lossless variant available (WMA Lossless) for archiving.
- Supports multichannel 5.1 surround audio.
Limitaciones
AMR Limitaciones
- Speech-only — music sounds distorted.
- Narrowband (8 kHz sample rate) — muffled compared to modern codecs.
- Patent-encumbered until recently — licensing fees slowed adoption outside telephony.
- Being phased out of new devices in favor of EVS and Opus.
- Non-standard extensions and variants make tooling inconsistent.
WMA Limitaciones
- Proprietary — poor support outside Windows and Windows Media Player.
- DRM variants made files brittle — many purchased tracks became unplayable when stores shut down.
- Ecosystem abandoned — no modern editors, hardware decoders, or streaming services use WMA.
- Windows 11 deprecated Windows Media Player entirely.
Especificaciones técnicas
| Especificación | AMR | WMA |
|---|---|---|
| MIME type | audio/amr | audio/x-ms-wma |
| Extensions | .amr, .3ga | — |
| Standard | 3GPP TS 26.071 (narrowband), TS 26.171 (wideband) | — |
| Sample rate | 8 kHz (AMR-NB); 16 kHz (AMR-WB) | — |
| Bitrates | 4.75, 5.15, 5.9, 6.7, 7.4, 7.95, 10.2, 12.2 kbps | — |
| Extension | — | .wma |
| Container | — | ASF (Advanced Systems Format) |
| Variants | — | WMA Standard, WMA Pro, WMA Lossless, WMA Voice |
| Max bitrate | — | 768 kbps (WMA Pro) |
Tamaños típicos de archivo
AMR
- 1-min voice memo 45-90 KB
- 1-hour voicemail archive 3-5 MB
WMA
- 3-min song (128 kbps) 3 MB
- 3-min song (Lossless) 25-35 MB
- 1-hour talk (64 kbps) 28 MB
¿Listo para convertir?
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Preguntas frecuentes
AMR (AMR Audio) is an audio formatoo de archivo used to store sound recordings — music, voice, podcasts, sound effects. The formato defines how the audio samples are comprimido (or stored raw), what bitrates are soportado, y how metadata como title, artist, album, y cover art is embedded. It is part del audio archivos family.
WMA (Windows Media Audio) is an audio formatoo de archivo used to store sound recordings — music, voice, podcasts, sound effects. The formato defines how the audio samples are comprimido (or stored raw), what bitrates are soportado, y how metadata como title, artist, album, y cover art is embedded. It is part del audio archivos family.
VLC, foobar2000, y the default media players en Windows y macOS handle AMR natively. On mobile, iOS Music y Android media apps vary in their support — popular formatoos work everywhere; niche ones may need a dedicated app. If playback fails en un device, convirtiendo to MP3 o AAC Normalmente solves it.
VLC, foobar2000, y the default media players en Windows y macOS handle WMA natively. On mobile, iOS Music y Android media apps vary in their support — popular formatoos work everywhere; niche ones may need a dedicated app. If playback fails en un device, convirtiendo to MP3 o AAC Normalmente solves it.
Upload the AMR to KaijuConverter y pick MP3, WAV, FLAC, AAC, OGG, o any other target. Our FFmpeg pipeline decodes the audio y re-encodes al target formato at sensible default bitrates (VBR ~190 kbps para music, 96 kbps para speech). Metadata y cover art travel con the audio where both formatoos support them.
AMR can be con pérdidas o sin pérdidas depending en el specific variant. con pérdidas variants (smaller files) discard some audio detail durante compresión in ways tuned to be inaudible; sin pérdidas variants preserve every sample exactly pero produce larger files. para distribution, con pérdidas at alta bitrate is estándar; para archival, sin pérdidas wins.