[FFmpeg-trac] #7749(ffmpeg:new): removes silence but unwanted speed up or pitch up the output.wav

[FFmpeg]

#7749: removes silence but unwanted speed up or pitch up the output.wav
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             Reporter:               |                     Type:  defect
  pitchsilence                       |
               Status:  new          |                 Priority:  normal
            Component:  ffmpeg       |                  Version:  git-
                                     |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Summary of the bug:
 How to reproduce:
 {{{
 % ./ffmpeg_20190219 -i input.wav -af
 silenceremove=start_periods=1:stop_periods=-1:start_threshold=-50dB:stop_threshold=-20dB:start_duration=0.0:stop_duration=0.0:start_silence=0.15:stop_silence=0.0
 -ac 1 -acodec pcm_s16le -ar 16000 output.wav
 ffmpeg version static build 20190219
 built on Ubuntu 18.04/ Linux Mint 19
 }}}
 This removes the silence as expected but add pitch up or speed up (can not
 say) to the output.wav.
 It seemed only to happen, when start_threshold is smaller than
 stop_threshold (-50dB < -20dB). Maybe it also happens on specific
 combinations of this two values.
 (I didn't tested all possibilities)

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Ticket URL: <https://trac.ffmpeg.org/ticket/7749>
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