[FFmpeg-trac] #3234(avfilter:open): Eval in volume filter problem

[FFmpeg]

#3234: Eval in volume filter problem
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             Reporter:  Ajaja        |                    Owner:
                 Type:  enhancement  |                   Status:  open
             Priority:  wish         |                Component:  avfilter
              Version:  git-master   |               Resolution:
             Keywords:  volume       |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Ajaja):

 > type:  defect => enhancement

 Smth like this works fine, for example:
 {{{
 ffmpeg -i input.flac -af volume=sin(0.1*2.2/0.21)*2 output.flac
 }}}

 Is problem with + and - operators really a feature but not a defect?

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Ticket URL: <https://trac.ffmpeg.org/ticket/3234#comment:2>
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