[FFmpeg-trac] #5931(avfilter:reopened): showwavespic, showspectrumpic innacurate length of resulting image

FFmpeg trac at avcodec.org
Wed Jun 27 03:55:27 EEST 2018

#5931: showwavespic, showspectrumpic innacurate length of resulting image
             Reporter:  jonata        |                    Owner:
                 Type:  defect        |                   Status:  reopened
             Priority:  minor         |                Component:  avfilter
              Version:  git-master    |               Resolution:
             Keywords:  showwavespic  |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
Changes (by keymapper):

 * cc: marcel@… (added)
 * status:  closed => reopened
 * resolution:  wontfix =>


 Why was this set to 'wontfix'? I have been running into this issue a bunch
 recently on the latest build (ffmpeg-20180619-a990184) and it is a pretty
 nasty bug, making features that are 95% complete basically useless due to
 unreliability/inaccuracy. PNGs end up with anywhere from 1 to 20 empty
 pixels on the right and there's no way to know which empty pixels are due
 to the bug and which are due to actual silence in the input audio. Does
 anyone know any way to work around this bug, like if there is some magic
 number for the .png dimensions that makes ffmpeg happy, or some way to
 calculate how many of the blank pixels are erroneous (is it a function of
 the length of the audio)?

Ticket URL: <https://trac.ffmpeg.org/ticket/5931#comment:4>
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