diff --git a/spa/include/spa/filter-graph/filter-graph.h b/spa/include/spa/filter-graph/filter-graph.h
index e1a5b0430..966f46942 100644
--- a/spa/include/spa/filter-graph/filter-graph.h
+++ b/spa/include/spa/filter-graph/filter-graph.h
@@ -32,10 +32,24 @@ extern "C" {
 #define SPA_VERSION_FILTER_GRAPH		0
 struct spa_filter_graph { struct spa_interface iface; };
 
+struct spa_filter_graph_info {
+	uint32_t n_inputs;
+	uint32_t n_outputs;
+
+#define SPA_FILTER_GRAPH_CHANGE_MASK_FLAGS		(1u<<0)
+#define SPA_FILTER_GRAPH_CHANGE_MASK_PROPS		(1u<<1)
+	uint64_t change_mask;
+
+	uint64_t flags;
+	struct spa_dict *props;
+};
+
 struct spa_filter_graph_events {
 #define SPA_VERSION_FILTER_GRAPH_EVENTS	0
 	uint32_t version;
 
+	void (*info) (void *object, const struct spa_filter_graph_info *info);
+
 	void (*apply_props) (void *object, enum spa_direction direction, const struct spa_pod *props);
 
 	void (*props_changed) (void *object, enum spa_direction direction);
diff --git a/spa/plugins/filter-graph/filter-graph.c b/spa/plugins/filter-graph/filter-graph.c
index 6ae50109b..00a261af1 100644
--- a/spa/plugins/filter-graph/filter-graph.c
+++ b/spa/plugins/filter-graph/filter-graph.c
@@ -46,6 +46,7 @@ SPA_LOG_TOPIC_DEFINE_STATIC(log_topic, "spa.filter-graph");
 		spa_hook_list_call_simple(hooks, struct spa_filter_graph_events,	\
 				method, version, ##__VA_ARGS__)
 
+#define spa_filter_graph_emit_info(hooks,...)		spa_filter_graph_emit(hooks,info, 0, __VA_ARGS__)
 #define spa_filter_graph_emit_apply_props(hooks,...)	spa_filter_graph_emit(hooks,apply_props, 0, __VA_ARGS__)
 #define spa_filter_graph_emit_props_changed(hooks,...)	spa_filter_graph_emit(hooks,props_changed, 0, __VA_ARGS__)
 
@@ -190,21 +191,32 @@ struct impl {
 	struct spa_fga_dsp *dsp;
 	struct spa_plugin_loader *loader;
 
+	uint64_t info_all;
+	struct spa_filter_graph_info info;
+
 	struct graph graph;
 
 	uint32_t quantum_limit;
 	uint32_t max_align;
 	long unsigned rate;
 
-	uint32_t in_ports;
-	uint32_t out_ports;
-
 	struct spa_list plugin_list;
 
 	float *silence_data;
 	float *discard_data;
 };
 
+static void emit_filter_graph_info(struct impl *impl, bool full)
+{
+	uint64_t old = full ? impl->info.change_mask : 0;
+
+	if (full)
+		impl->info.change_mask = impl->info_all;
+	if (impl->info.change_mask || full) {
+		spa_filter_graph_emit_info(&impl->hooks, &impl->info);
+		impl->info.change_mask = old;
+	}
+}
 static int
 impl_add_listener(void *object,
 		struct spa_hook *listener,
@@ -216,6 +228,9 @@ impl_add_listener(void *object,
 
 	spa_log_trace(impl->log, "%p: add listener %p", impl, listener);
 	spa_hook_list_isolate(&impl->hooks, &save, listener, events, data);
+
+	emit_filter_graph_info(impl, true);
+
 	spa_hook_list_join(&impl->hooks, &save);
 
 	return 0;
@@ -1591,21 +1606,21 @@ static int setup_graph(struct graph *graph, struct spa_json *inputs, struct spa_
 		goto error;
 	}
 
-	if (impl->in_ports == 0)
-		impl->in_ports = n_input;
-	if (impl->out_ports == 0)
-		impl->out_ports = n_output;
+	if (impl->info.n_inputs == 0)
+		impl->info.n_inputs = n_input;
+	if (impl->info.n_outputs == 0)
+		impl->info.n_outputs = n_output;
 
 	/* compare to the requested number of inputs and duplicate the
 	 * graph n_hndl times when needed. */
-	n_hndl = impl->in_ports / n_input;
-	if (n_hndl != impl->out_ports / n_output) {
+	n_hndl = impl->info.n_inputs / n_input;
+	if (n_hndl != impl->info.n_outputs / n_output) {
 		spa_log_error(impl->log, "invalid ports. The input stream has %1$d ports and "
 				"the filter has %2$d inputs. The output stream has %3$d ports "
 				"and the filter has %4$d outputs. input:%1$d / input:%2$d != "
 				"output:%3$d / output:%4$d. Check inputs and outputs objects.",
-				impl->in_ports, n_input,
-				impl->out_ports, n_output);
+				impl->info.n_inputs, n_input,
+				impl->info.n_outputs, n_output);
 		res = -EINVAL;
 		goto error;
 	}
@@ -1621,8 +1636,8 @@ static int setup_graph(struct graph *graph, struct spa_json *inputs, struct spa_
 				"the filter has %2$d inputs. The output stream has %3$d ports "
 				"and the filter has %4$d outputs. Some filter ports will be "
 				"unconnected..",
-				impl->in_ports, n_input,
-				impl->out_ports, n_output);
+				impl->info.n_inputs, n_input,
+				impl->info.n_outputs, n_output);
 	}
 	spa_log_info(impl->log, "using %d instances %d %d", n_hndl, n_input, n_output);
 
@@ -2027,9 +2042,9 @@ impl_init(const struct spa_handle_factory *factory,
 		if (spa_streq(k, "clock.quantum-limit"))
 			spa_atou32(s, &impl->quantum_limit, 0);
 		if (spa_streq(k, "filter-graph.n_inputs"))
-			spa_atou32(s, &impl->in_ports, 0);
+			spa_atou32(s, &impl->info.n_inputs, 0);
 		if (spa_streq(k, "filter-graph.n_outputs"))
-			spa_atou32(s, &impl->out_ports, 0);
+			spa_atou32(s, &impl->info.n_outputs, 0);
 	}
 	if (impl->quantum_limit == 0)
 		return -EINVAL;
diff --git a/src/modules/module-filter-chain.c b/src/modules/module-filter-chain.c
index b09b94895..39fd14d96 100644
--- a/src/modules/module-filter-chain.c
+++ b/src/modules/module-filter-chain.c
@@ -1088,6 +1088,30 @@ done:
 	return res < 0 ? res : 0;
 }
 
+static void copy_position(struct spa_audio_info_raw *dst, const struct spa_audio_info_raw *src)
+{
+	if (SPA_FLAG_IS_SET(dst->flags, SPA_AUDIO_FLAG_UNPOSITIONED) &&
+	    !SPA_FLAG_IS_SET(src->flags, SPA_AUDIO_FLAG_UNPOSITIONED)) {
+		for (uint32_t i = 0; i < src->channels; i++)
+			dst->position[i] = src->position[i];
+		SPA_FLAG_CLEAR(dst->flags, SPA_AUDIO_FLAG_UNPOSITIONED);
+	}
+}
+
+static void graph_info(void *object, const struct spa_filter_graph_info *info)
+{
+	struct impl *impl = object;
+	if (impl->capture_info.channels == 0)
+		impl->capture_info.channels = info->n_inputs;
+	if (impl->playback_info.channels == 0)
+		impl->playback_info.channels = info->n_outputs;
+
+	if (impl->capture_info.channels == impl->playback_info.channels) {
+		copy_position(&impl->capture_info, &impl->playback_info);
+		copy_position(&impl->playback_info, &impl->capture_info);
+	}
+}
+
 static void graph_apply_props(void *object, enum spa_direction direction, const struct spa_pod *props)
 {
 	struct impl *impl = object;
@@ -1113,6 +1137,7 @@ static void graph_props_changed(void *object, enum spa_direction direction)
 
 struct spa_filter_graph_events graph_events = {
 	SPA_VERSION_FILTER_GRAPH_EVENTS,
+	.info = graph_info,
 	.apply_props = graph_apply_props,
 	.props_changed = graph_props_changed,
 };