[FFmpeg-trac] #9899(undetermined:new): silenceremove bug

[FFmpeg]

#9899: silenceremove bug
-------------------------------------+-------------------------------------
             Reporter:  Jozef        |                    Owner:  (none)
  Chutka                             |
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:               |               Blocked By:
  silenceremove                      |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Description changed by Jozef Chutka:

Old description:

> using ffmpeg version 2022-07-31-git-1368b5a725-full_build-www.gyan.dev
>
> `silenceremove` seems to remove whole audio content in some cases. Having
> supershort `adelay` before `silenceremove` serves as a fix.
>
> {{{
> ffmpeg -i input -af
> silenceremove=start_periods=1:stop_periods=1:detection=peak out-empty.m4a
> -y
>
> ffmpeg -i input -af
> adelay=delays=1:all=1,silenceremove=start_periods=1:stop_periods=1:detection=peak
> out-ok.m4a -y
> }}}

New description:

 using ffmpeg version 2022-07-31-git-1368b5a725-full_build-www.gyan.dev

 `silenceremove` seems to remove whole audio content in some cases. Having
 supershort `adelay` before `silenceremove` serves as a fix.

 {{{
 ffmpeg -i input -af
 silenceremove=start_periods=1:stop_periods=1:detection=peak out-empty.m4a
 -y

 ffmpeg -i input -af
 adelay=delays=1:all=1,silenceremove=start_periods=1:stop_periods=1:detection=peak
 out-ok.m4a -y
 }}}

 out-empty.m4a has 258 bytes and can not be played
 out-ok.m4a 9733 bytes, and seems ok

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Ticket URL: <https://trac.ffmpeg.org/ticket/9899#comment:1>
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