[Libav-user] ffmpeg showspectrum to file

[Ricky Huang]

On May 7, 2014, at 1:36 PM, wm4 <nfxjfg at googlemail.com> wrote:

> On Wed, 7 May 2014 11:44:26 -0700
> Ricky Huang <rhuang.work at gmail.com> 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.
> 
> AFAIK -vf is for video-to-video filters only. You either need a
> "complex" graph, or you use the lavfi thing as input like you did with
> ffplay.

Do you mean ffplay and ffmpeg can be chained together?  Is there an example of that?


> 
>> 
>> Thanks in advance!
>> 
> 
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