This was the original intend.
---
libavfilter/vf_signalstats.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/libavfilter/vf_signalstats.c b/libavfilter/vf_signalstats.c
index 47545aa..8c6a2d6 100644
--- a/libavfilter/vf_signalstats.c
+++ b/libavfilter/vf_signalstats.c
@@ -294,8 +294,10 @@ static int filter_frame(AVFilterLink *link, AVFrame *in)
prev = s->frame_prev;
- if (s->outfilter != FILTER_NONE)
+ if (s->outfilter != FILTER_NONE) {
out = av_frame_clone(in);
+ av_frame_make_writable(out);
+ }
for (fil = 0; fil < FILT_NUMB; fil ++)
if ((s->filters & 1<<fil) && filters_def[fil].init)
--
2.1.3
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