For who it concerns...
Amr audio support was removed from FFmpeg a while ago because of a license issue.
It came back (also a while ago) as opencore amr.
Ramiro Polla updated his FFmpeg auto-builds to the GPLv3 license to be able to add it.
DEA libopencore_amrnb OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band
D A libopencore_amrwb OpenCORE Adaptive Multi-Rate (AMR) Wide-Band
* bold is the codec name to use for encoding.
Build SVN-r20175 is the first one that has the opencore amr library included.
http://ffmpeg.arrozcru.org/autobuilds
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