<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div>On May 7, 2014, at 1:36 PM, wm4 <<a href="mailto:nfxjfg@googlemail.com">nfxjfg@googlemail.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">On Wed, 7 May 2014 11:44:26 -0700<br>Ricky Huang <<a href="mailto:rhuang.work@gmail.com">rhuang.work@gmail.com</a>> wrote:<br><br><blockquote type="cite">Hello all,<br><br>I am experimenting to the showspectrum filter. According to the example at <a href="http://www.ffmpeg.org/ffmpeg-filters.html#Examples-11:">http://www.ffmpeg.org/ffmpeg-filters.html#Examples-11:</a><br><br><blockquote type="cite">ffplay -f lavfi 'amovie=input.mp3, asplit [a][out1]; [a] showspectrum=mode=separate:color=intensity:slide=1:scale=cbrt [out0]'<br></blockquote><br>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:<br><br><blockquote type="cite">./ffmpeg -i Q-full-circle.mp3 -vf showspectrum=mode=separate:color=intensity:slide=1:scale=cbrt -y full-circle.avi<br></blockquote><br><br>the command executes without error, the video file gets generated, but no video is produced.<br></blockquote><br>AFAIK -vf is for video-to-video filters only. You either need a<br>"complex" graph, or you use the lavfi thing as input like you did with<br>ffplay.<br></blockquote><div><br></div><div>Do you mean ffplay and ffmpeg can be chained together? Is there an example of that?</div><div><br></div><br><blockquote type="cite"><br><blockquote type="cite"><br>Thanks in advance!<br><br></blockquote><br>_______________________________________________<br>Libav-user mailing list<br><a href="mailto:Libav-user@ffmpeg.org">Libav-user@ffmpeg.org</a><br>http://ffmpeg.org/mailman/listinfo/libav-user<br></blockquote></div><br></body></html>