[FFmpeg-trac] #9461(avfilter:new): Showpectrum scale doesn't work anymore

FFmpeg trac at avcodec.org
Tue Oct 19 14:32:08 EEST 2021

#9461: Showpectrum scale doesn't work anymore
             Reporter:  RKleinert  |                     Type:  defect
               Status:  new        |                 Priority:  normal
            Component:  avfilter   |                  Version:  git-master
             Keywords:             |               Blocked By:
             Blocking:             |  Reproduced by developer:  0
Analyzed by developer:  0          |
 == Summary of the bug: ==
 In https://trac.ffmpeg.org/ticket/8919 I had adressed a bug that would
 mess up the scaling of the frequency-axis in showspectrum() and
 showspectrumpic() when choosing a starting-frequency that is not zero.
 This bug is now supposedly fixed.

 Now after the "fix" both functions won't work anymore at all when used
 with my prevousily used arguments. Especialy defining an output size
 (which is crucial) seems to lead to a never ending loop where ffmepg
 doesn't get anywhere. My batch-script doesn't end and no output is

 Secondly I noticed, that the argument "legend" doesn't default to 0 (as it
 states in the doc) but to 1 - so the legend and axes are always enabled if
 not actively disabled.

 == How to reproduce: ==
 #!div style="font-size: 80%"
 The Sample Code:
   ffmpeg -i input.wav -filter_complex

 leads into an endless loop. Whereas the code without the size-argument:
   ffmpeg -i input.wav -filter_complex
 does the trick (although it takes quite some time to run)
 ffmpeg version 2021-10-18-git-d04c005021-full
 built from gyan.dev

 I supplied the input.wav file which is a test-sample with a 1kHz-Sinewave
Ticket URL: <https://trac.ffmpeg.org/ticket/9461>
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