[Libav-user] ffmpeg showspectrum to file
nfxjfg at googlemail.com
Wed May 7 22:36:44 CEST 2014
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
> Thanks in advance!
More information about the Libav-user