[FFmpeg-trac] #9049(avfilter:new): astats undefined behaviour on float pcm having peaks much greater than 1.0

[FFmpeg]

#9049: astats undefined behaviour on float pcm having peaks much greater than 1.0
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             Reporter:  danadam       |                    Owner:
                 Type:  defect        |                   Status:  new
             Priority:  important     |                Component:  avfilter
              Version:  git-master    |               Resolution:
             Keywords:  astats crash  |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
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Comment (by danadam):

 > please provide the ffmpeg command line running inside gdb including its
 complete, uncut console output and the backtrace etc.
 Added gdb-full.out.txt.

 > please attach an input file that allows to reproduce.
 Added loud2.wav.

 > I don't think a sample file is needed, this crash can be reproduced with
 a single command line:
 Yep

 > Unfortunately valgrind and ffmpeg here are fine. Build with clang.
 True. If I read things correctly then `gcc` optimizes more aggressively
 than `clang` and removes the `a < amin` check in `av_clip()` function.
 Presumably because `FFABS(nd) * HISTOGRAM_MAX` cannot be negative.

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Ticket URL: <https://trac.ffmpeg.org/ticket/9049#comment:6>
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