Hi!
Attached patch fixes ticket #4812 for Robert, I suspect it
will not fix all use-cases but maybe it is a good start?
Carl Eugen
diff --git a/libavfilter/vf_scale.c b/libavfilter/vf_scale.c
index a1a19bb..545e2b7 100644
--- a/libavfilter/vf_scale.c
+++ b/libavfilter/vf_scale.c
@@ -374,6 +374,10 @@ static int config_props(AVFilterLink *outlink)
av_opt_set_int(*s, "sws_flags", scale->flags, 0);
av_opt_set_int(*s, "param0", scale->param[0], 0);
av_opt_set_int(*s, "param1", scale->param[1], 0);
+ if (scale->in_range)
+ av_opt_set_int(*s, "src_range", scale->in_range > 1, 0);
+ if (scale->out_range)
+ av_opt_set_int(*s, "dst_range", scale->out_range > 1, 0);
if (scale->opts) {
AVDictionaryEntry *e = NULL;
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