From 4020787b5bbd2ac159c860d1d1ec983837bf31bb Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Mon, 28 Dec 2015 20:20:32 +0100
Subject: [PATCH] avfilter/avf_showspectrum: make colors for log scale more
user friendly
Previosly output was almost useless because background noise, due to
windowing function picked and which is not actually present in audio,
had too much brightness.
Now output of sine wave matches more with SoX.
Signed-off-by: Paul B Mahol <onemda@gmail.com>
---
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 433400dd62f..0e2e84be5d0 100644
--- a/libavfilter/avf_showspectrum.c
+++ b/libavfilter/avf_showspectrum.c
@@ -380,7 +380,7 @@ static int plot_spectrum_column(AVFilterLink *inlink, AVFrame *insamples)
a = cbrt(a);
break;
case LOG:
- a = 1 + log10(FFMAX(FFMIN(1, a), 1e-6)) / 6; // zero = -120dBFS
+ a = 1 + log10(FFMAX(FFMIN(1, a), 1e-6)) / 5; // zero = -120dBFS
break;
default:
av_assert0(0);
--
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