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Commit 836c8750 authored by Paul B Mahol's avatar Paul B Mahol
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avfilter/avf_showspectrum: fix 2 possible crashes 


Make sure no division by zero is done.
Make sure there are actually samples available.

Signed-off-by: default avatarPaul B Mahol <onemda@gmail.com>
parent 29fbce8f
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