avfilter/af_biquads: make sure that biquad filter still works

diff --git a/libavfilter/af_biquads.c b/libavfilter/af_biquads.c
index 549724ec4ebd61984a4473ed2b95580e8fc1c2c0..3ec26d2a9d7e52ab9032b22be3f92f49c339ecf0 100644 (file)
--- a/libavfilter/af_biquads.c
+++ b/libavfilter/af_biquads.c
@@ -440,7 +440,7 @@ static int config_filter(AVFilterLink *outlink, int reset)
         return 0;
     }
 
-    if (w0 > M_PI || w0 <= 0.)
+    if ((w0 > M_PI || w0 <= 0.) && (s->filter_type != biquad))
         return AVERROR(EINVAL);
 
     switch (s->width_type) {