playsinkconvertbin: Filter out ANY capsfeatures from the converter caps

We can't convert to ANY capsfeatures, they are only there so that we
can passthrough whatever downstream can support... but we definitely
don't want to return them to upstream.

gst/playback/gstplaysinkconvertbin.c

@@ -394,8 +394,30 @@ gst_play_sink_convert_bin_getcaps (GstPad * pad, GstCaps * filter)
       gst_object_unref (peer);
       if (self->converter_caps && is_raw_caps (peer_caps, self->audio)) {
         GstCaps *converter_caps = gst_caps_ref (self->converter_caps);
+        GstCapsFeatures *cf;
+        GstStructure *s;
+        guint i, n;
+
         GST_PLAY_SINK_CONVERT_BIN_FILTER_CAPS (filter, converter_caps);
-        ret = gst_caps_merge (peer_caps, converter_caps);
+
+        ret = gst_caps_make_writable (peer_caps);
+
+        /* Filter out ANY capsfeatures from the converter caps. We can't
+         * convert to ANY capsfeatures, they are only there so that we
+         * can passthrough whatever downstream can support... but we
+         * definitely don't want to return them here
+         */
+        n = gst_caps_get_size (converter_caps);
+        for (i = 0; i < n; i++) {
+          s = gst_caps_get_structure (converter_caps, i);
+          cf = gst_caps_get_features (converter_caps, i);
+
+          if (cf && gst_caps_features_is_any (cf))
+            continue;
+          ret =
+              gst_caps_merge_structure_full (ret, gst_structure_copy (s),
+              (cf ? gst_caps_features_copy (cf) : NULL));
+        }
       } else {
         ret = peer_caps;
         GST_PLAY_SINK_CONVERT_BIN_FILTER_CAPS (filter, ret);