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What is AMR?

AMR stands for adaptive multi-rate audio codec. AMR is used in telephony applications to encode speech at low bit-rate.

Store audio recordings in handsets (Example: Android Voice Recorder)
Low bandwidth voice applications

AMR media comes inside a 3GPP 3gp container, or sometimes a simple .amr container. Inside .3gp files, AMR audio can go with a video track.

Treasured can detect AMR in damaged audio files.

How to repair a corrupt AMR audio file

The easiest way is certainly to ask our Treasured Repair Service to do it for you.
But for those who can program, here you have a few tips:

Techniques used are:

Reindexing
Patching of the file with a sample description from a good file

Audio track has a amr or a samr codec fourcc.

Example: immediately after mdat marker, we have a 32 bytes frames starting with 3c

						
00000ea: 3cf8 c97a 4b45 7e02 5867 2c23 cf50 b62a  <..zKE~.Xg,#.P.*
00000fa: 5824 0f5e 0116 3f0c 7bbd da4a 58ac c5d0  X$.^..?.{..JX...
000010a: 3c32 702c 3609 400c 7e01 4467 a5ae 1e1a  <2p,6.@.~.Dg....