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

[Michel Bardiaux]

parag arole wrote:
> 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. 

Isnt faad (delta) the one you need for decoding?

> 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'

Maybe ffmpeg is right and there is no aac format, only an aac codec? Try 
  out.m4a.

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


-- 
Michel Bardiaux
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Tel : +32 2 790.29.41