This is faster; precision assured as result is a float.
Signed-off-by: Ganesh Ajjanagadde <[email protected]>
---
libavfilter/avf_showspectrum.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavfilter/avf_showspectrum.c b/libavfilter/avf_showspectrum.c
index accd8c7..cff98ff 100644
--- a/libavfilter/avf_showspectrum.c
+++ b/libavfilter/avf_showspectrum.c
@@ -578,7 +578,7 @@ static int plot_spectrum_column(AVFilterLink *inlink,
AVFrame *insamples)
a = cbrt(a);
break;
case FOURTHRT:
- a = pow(a, 0.25);
+ a = sqrt(sqrt(a));
break;
case FIFTHRT:
a = pow(a, 0.20);
--
2.6.4
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