Comment 1 for bug 93849

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Reinhard Tartler (siretart) wrote : Re: ffmpeg does not have AMR audio support

While having a look at the linked zip file you pointed to, I found this in the included word document:

Copyright Notification
No part may be reproduced except as authorized by written permission.
The copyright and the foregoing restriction extend to reproduction in all media.

Sorry, this means we cannot include it into our ffmpeg tree.

I suggest you work together with ffmpeg upstream to get a free implementation of AMR into ffmpeg.