[Ffmpeg-devel] [Ffmpeg-devel-old] AAC support in ffmpeg

[parag arole]

Hi, I am trying to decode AAC-LC audio and save it as amr(nb) from an
MP4 (also tried MOV ) file using ffmpeg, as follows -
./ffmpeg -i ./test.mp4 -acodec amr_nb -ar 8000 -ac 1 -ab 12 -y -vn out.amr

This is the ffmpeg's response-
 
         ffmpeg version 0.4.9-pre1, build 4747, Copyright (c)
2000-2004 Fabrice Bellard
         configuration:  --enable-faac --enable-amr_nb --enable-amr_nb-fixed 
         built on Apr 21 2005 15:58:19, gcc: 3.2.3 20030502 (Red Hat
Linux 3.2.3-52)

        Input #0, mov,mp4,m4a,3gp,3g2, from './Picnic.mp4':
        Duration: 00:00:40.6, start: 0.000000, bitrate: 107 kb/s
        Stream #0.0: Video: mpeg4, 192x144, 15.01 fps
        Stream #0.1: Audio: 0x6134706d, 44100 Hz, mono

        Unsupported codec (id=86018) for input stream #0.1

I have installed libfaac and built ffmpeg with faac and amr_nb
enabled, as can be seen above. The AMR encoding works for MP2 and
Windows media audio codecs.
Also, I confirmed using mp4UI that the input audio stream is AAC LC.

I also tried to convert AMR audio files to ACC as - 
       ffmpeg -i ./out.amr -acodec aac -y -vn out.aac
But this does not work either.

ffmpeg returns the following -

      Stream #0.0: Audio: amr_nb, 8000 Hz, mono
      Unable for find a suitable output format for 'out.aac'

I would really appreciate any help in understanding why AAC audio
decoding/encoding is not working.
Thanks and regards,
Parag Arole


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