[Libav-user] Grab audio samples with ffmpeg and C, error with official example code

[Mohamed Nmn]

Hello
What are ffmbeg commands to remove noise from the sound
thanks

‫في الأحد، 30 أغسطس 2020 في 9:18 ص تمت كتابة ما يلي بواسطة ‪Paul B Mahol‬‏
<‪onemda at gmail.com‬‏>:‬

> On 8/29/20, nji9 at arcor.de <nji9 at arcor.de> wrote:
> > For dev I'm using v. 4.3.1. and also the latest Git version of ffmpeg
> > (Zeranoe's Windows 64 builds).
> >
> > I get "strange" problems when running the official example code for
> decoding
> > audio
> >
> > https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/decode_audio.c
> >
> > MP3DirectCut(Lib-bass).mp3
> >
> >
> http://www.mediafire.com/file/ozmjjcpwyhhdnr7/MP3DirectCut(Lib-bass).mp3/file
> >
> > Generates pcm, but outputs:
> >
> > "Warning: the sample format the decoder produced is planar (s16p).
> > This example will output the first channel only."
> >
> > But the output pcm has both channels!??
> >
> > When recoding the above mp3 to wav with ffmpeg (4.1.4, no error message)
> >
> > http://www.mediafire.com/file/gcq7ryg43pd57q5/ffmpeg4.1.4.wav/file
> >
> > and also when recoding the latter to mp3 again
> >
> >
> http://www.mediafire.com/file/ij865dkrprn2lta/ffmpeg4.1.4_recode.mp3/file
> >
> > the example code breaks and produces these error messages ("mp2 @ ..."
> also
> > for the wav file):
> >
> > avcodec_send_packet ()
> > from within:
> > "[mp2 @ <someAddress>] Header missing"
> > and returns error code -1094995529
> > (= "Invalid data found when processing input")
> >
> > It produces that error message for literally all other formats I tried,
> and
> > also when written with another editor (Audition 3.0).
> > But all the files play and show fine on all programs I have.
> >
> > I'm at a lost at this point. What is going on and wrong here?
>
> Just because decode_audio does not skip ID3 metadata from start of
> later mp3 file.
> That is reasonably as program is just demonstration and not full blown
> solution.
>
> >
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> >
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