[FFmpeg-user] Unable to transcode from aac to amrwb.

[bat guano]

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> Subject: [FFmpeg-user] Unable to transcode from aac to amrwb.
>
> Hi all,
> I am a new bie here, trying to use a video source and transcode its aac
> audio to amr directly.
> command being used is:
> ffmpeg -i input.mp4 -vn out.amr
>
> ffmpeg version git-2012-10-29-19add32 Copyright (c) 2000-2012 the FFmpeg
> developers
> built on Oct 29 2012 23:59:33 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
> configuration: --enable-gpl --enable-libx264 --enable-libmp3lame
> --enable-nonfree

Hi

FFmpeg needs to be compiled with "--enable-libvo-amrwbenc".

Then use commands like these:-

$ ffmpeg -i input.mp4 -vn -c:a libvo_amrwbenc -b:a 12.65k -ar 16k -ac 1 out.amr

$ ffmpeg -i input.mp4 -vn -c:a libvo_amrwbenc -b:a 23.85k -ar 16k -ac 1 out.amr