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:
Paul B Mahol <onemda@gmail.com>
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Make sure no division by zero is done.
Make sure there are actually samples available.
Signed-off-by:
Paul B Mahol <onemda@gmail.com>