[FFmpeg-trac] #8911(avfilter:new): showspectrumpic innacurate zoom of resulting image with stop and size options

FFmpeg trac at avcodec.org
Mon Sep 28 15:45:22 EEST 2020


#8911: showspectrumpic innacurate zoom of resulting image with stop and size
options
-------------------------------------+-------------------------------------
             Reporter:  semiaddict   |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  avfilter     |                  Version:  git-
             Keywords:               |  master
  showspectrumpic stop zoom          |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 '''Summary of the bug:'''
 When using the [https://ffmpeg.org/ffmpeg-filters.html#showspectrumpic
 showspectrumpic] filter with a value for the ''stop'' option along with a
 ''size'', the resulting image seems to always stop at a much lower
 frequency than the one specified.
 The legend on the top right corner (Zoom: ...) is, however, correct.
 This doesn't seem to be the case if the ''size'' option is not specified,
 and the issue seems to occur whether or not the ''legend'' option is
 active.

 '''
 How to reproduce:'''
 {{{
 ffmpeg -i http://commondatastorage.googleapis.com/gtv-videos-
 bucket/sample/BigBuckBunny.mp4 -filter_complex
 showspectrumpic=stop=5000:size=1024x768:legend=1 output.png
 }}}
 ffmpeg version 4.3
 built on commit a3a6b56

 This was tested on multiple files including
 http://commondatastorage.googleapis.com/gtv-videos-
 bucket/sample/BigBuckBunny.mp4

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8911>
FFmpeg <https://ffmpeg.org>
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