[Libav-user] ffmpeg showspectrum to file

[Clément Bœsch]

On Wed, May 07, 2014 at 11:44:26AM -0700, Ricky Huang wrote:
> Hello all,
> 
> I am experimenting to the showspectrum filter.  According to the example at http://www.ffmpeg.org/ffmpeg-filters.html#Examples-11:
> 
> > ffplay -f lavfi 'amovie=input.mp3, asplit [a][out1]; [a] showspectrum=mode=separate:color=intensity:slide=1:scale=cbrt [out0]'
> 
> but I cannot figure out how to output the showspectrum result to a saved video with ffmpeg command.  When I adopt the ffplay command to ffmpeg:
> 
> > ./ffmpeg -i Q-full-circle.mp3 -vf showspectrum=mode=separate:color=intensity:slide=1:scale=cbrt -y full-circle.avi
> 
> 
> the command executes without error, the video file gets generated, but no video is produced.
> 

./ffmpeg -f lavfi -i amovie=Q-full-circle.mp3,showspectrum=mode=separate:color=intensity:slide=1:scale=cbrt -y full-circle.avi

or

./ffmpeg -i Q-full-circle.mp3 -filter_complex showspectrum=mode=separate:color=intensity:slide=1:scale=cbrt -y full-circle.avi

-- 
Clément B.
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