On May 7, 2014, at 1:36 PM, wm4 <[email protected]> wrote: > On Wed, 7 May 2014 11:44:26 -0700 > Ricky Huang <[email protected]> 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! >> > > _______________________________________________ > Libav-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/libav-user
_______________________________________________ Libav-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/libav-user
