From 36572a0c1d12459cb0fddf6ff8023b79ffa2e100 Mon Sep 17 00:00:00 2001 From: Rui Zhu Date: Wed, 31 Aug 2022 20:51:06 +0800 Subject: [PATCH] avfilter/af_loudnorm: fix incorrect gain when audio is shorter than 3s The input data is multiplied by `s->offset` to get normalized output. `s->target_tp` and `true_peak` is not in dB, so `s->offset` should be calculated by division instead of subtraction. Signed-off-by: Rui Zhu --- libavfilter/af_loudnorm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavfilter/af_loudnorm.c b/libavfilter/af_loudnorm.c index 8d2379f14e..ce61e985b1 100644 --- a/libavfilter/af_loudnorm.c +++ b/libavfilter/af_loudnorm.c @@ -455,7 +455,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in) offset = pow(10., (s->target_i - global) / 20.); offset_tp = true_peak * offset; - s->offset = offset_tp < s->target_tp ? offset : s->target_tp - true_peak; + s->offset = offset_tp < s->target_tp ? offset : s->target_tp / true_peak; s->frame_type = LINEAR_MODE; }