[FFmpeg-devel] Fwd: Help with codecs

Michael Niedermayer michaelni at gmx.at
Tue May 12 21:17:49 CEST 2015

On Tue, May 12, 2015 at 05:16:51PM +0200, Fernandon Bautista wrote:
> Dear all,
> we have some audio files that we need to convert to WAVE audio, Microsoft
> PCM, 16 bit, mono 8000 Hz format. They are encoded in a proprietary
> software codec that it only runs on Windows. We need to process the audio
> decoding in Linux servers and thus we need to find an alternative.
> Base on the provider, we expect the audios to be one of those codecs (
> http://www.shouldiremoveit.com/Verint-Multimedia-Support-Package-100067-program.aspx
> ):
> g7231
> g726
> g729
> We have tried all of them:
> ffmpeg -acodec g723_1  -i test.wav -acodec pcm_s16le -map 0 -f wav
> test_out.wav
> ffmpeg -acodec g726  -i test.wav -acodec pcm_s16le -map 0 -f wav
> test_out.wav
> ffmpeg -acodec g729  -i test.wav -acodec pcm_s16le -map 0 -f wav
> test_out.wav
> without exit.
> Along with these email I have attached an audio file(which does not contain
> any conversation because of privacy issues). We would really appreciate if
> you could suggest any advice or direction.

please provide a longer audio sample both the original with unknown
compression and the decompressed by windows pcm
Ideal may be a sine sweep and some diverse music

also please dont attach large files but upload them somewhere and
provide a link (see our bug reporting instructions if you dont know
where to upload)



Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Those who are too smart to engage in politics are punished by being
governed by those who are dumber. -- Plato 
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