[FFmpeg-trac] #2759(undetermined:closed): Audio equalizer filter problem - clipping with negative gain

[FFmpeg]

#2759: Audio equalizer filter problem  - clipping with negative gain
-------------------------------------+-------------------------------------
             Reporter:  Ajaja        |                    Owner:
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:               |               Resolution:  invalid
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------

Comment (by Ajaja):

 How can equalizing with negative gain (-5dB in the example) at some
 frequency cause clipping (or message about clipping)?
 {{{
 % ffmpeg -i noise.wav -filter:a "astats" -vn -f null NUL
 ....
 [Parsed_astats_0 @ 000000000263ac60] Overall
 [Parsed_astats_0 @ 000000000263ac60] DC offset: 0.000367
 [Parsed_astats_0 @ 000000000263ac60] Min level: -0.989990
 [Parsed_astats_0 @ 000000000263ac60] Max level: 0.989990
 }}}

 After equalizing:
 {{{
 % ffmpeg -i noise2.wav -filter:a "astats" -vn -f null NUL
 ....
 [Parsed_astats_0 @ 000000000036ac60] Overall
 [Parsed_astats_0 @ 000000000036ac60] DC offset: 0.000367
 [Parsed_astats_0 @ 000000000036ac60] Min level: -0.989990
 [Parsed_astats_0 @ 000000000036ac60] Max level: 0.989990
 }}}

 Where is clipping?

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2759#comment:3>
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