Adaptive Multi-Rate Audio
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|formattype=electronic | |formattype=electronic | ||
|subcat=Audio and Music | |subcat=Audio and Music | ||
| − | |extensions={{ext|amr}} | + | |extensions={{ext|amr}} {{ext|3ga}} |
|wikidata={{wikidata|Q4676210}} | |wikidata={{wikidata|Q4676210}} | ||
|locfdd={{LoCFDD|fdd000254}} | |locfdd={{LoCFDD|fdd000254}} | ||
| − | |mimetype={{mimetype|audio/ | + | |mimetype={{mimetype|audio/AMR}} |
|pronom={{PRONOM|fmt/356}} | |pronom={{PRONOM|fmt/356}} | ||
}} | }} | ||
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==File Identification== | ==File Identification== | ||
The first 5 bytes of an AMR is the hex values {{magic|2321414D52}} or ascii <code>#!AMR</code> | The first 5 bytes of an AMR is the hex values {{magic|2321414D52}} or ascii <code>#!AMR</code> | ||
| + | |||
| + | ===Specifications=== | ||
| + | * [https://datatracker.ietf.org/doc/html/rfc4867 RFC 4867 RTP Payload Format and File Storage Format for the Adaptive Multi-Rate (AMR) and Adaptive Multi-Rate Wideband (AMR-WB)] | ||
| + | |||
| + | == Software == | ||
| + | * [[FFmpeg]] | ||
| + | * [http://sox.sourceforge.net/ SoX] | ||
==Sample Files== | ==Sample Files== | ||
* [https://www.online-convert.com/file-format/amr AMR info and sample] | * [https://www.online-convert.com/file-format/amr AMR info and sample] | ||
* [https://gerrit.pixelexperience.org/plugins/gitiles/frameworks_base/+/a539807a7c50948eec99b27e2d4d05da208ae3f1/media/tests/contents/media_api/music/test_amr_ietf.amr Sample AMR] | * [https://gerrit.pixelexperience.org/plugins/gitiles/frameworks_base/+/a539807a7c50948eec99b27e2d4d05da208ae3f1/media/tests/contents/media_api/music/test_amr_ietf.amr Sample AMR] | ||
| − | * | + | * {{DexvertSamples|audio/amr}} |
== References == | == References == | ||
<references/> | <references/> | ||
Latest revision as of 04:08, 28 December 2023
Adaptive Multi-Rate Audio is a narrowband audio compression format optimized for speech. AMR is a codec adopted by 3GPP and used by many mobile systems.[1][2][3] Apple iOS used the format for voice recordings and voicemail, but changed to the CAF in iOS 12.2[4]
See also AMR-WB
Contents |
[edit] File Identification
The first 5 bytes of an AMR is the hex values 2321414D52 or ascii #!AMR
