[Libav-user] ffmpeg showspectrum to file

Ricky Huang rhuang.work at gmail.com
Wed May 7 20:44:26 CEST 2014

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.

Thanks in advance!

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