diff --git a/spa/include/spa/pod/builder.h b/spa/include/spa/pod/builder.h
index 83bd4402f..9992f5276 100644
--- a/spa/include/spa/pod/builder.h
+++ b/spa/include/spa/pod/builder.h
@@ -398,6 +398,8 @@ static inline uint32_t spa_pod_flag_from_id(char id)
 		return SPA_POD_PROP_FLAG_READONLY;
 	case 'd':
 		return SPA_POD_PROP_FLAG_DEPRECATED;
+	case 'i':
+		return SPA_POD_PROP_FLAG_INFO;
 	default:
 		return 0;
 	}
@@ -500,7 +502,9 @@ spa_pod_builder_addv(struct spa_pod_builder *builder,
 		     const char *format, va_list args)
 {
 	while (format) {
-		switch (*format) {
+		char t = *format;
+	      next:
+		switch (t) {
 		case '<':
 		{
 			uint32_t id = va_arg(args, uint32_t);
@@ -516,32 +520,28 @@ spa_pod_builder_addv(struct spa_pod_builder *builder,
 			break;
 		case ':':
 		{
-			const char *spec;
-			char type;
 			int n_values;
 			uint32_t key, flags;
 
 			key = va_arg(args, uint32_t);
-			format = spec = va_arg(args, const char *);
-			type = *spec;
-			if (*spec != '\0')
-				spec++;
-			flags = spa_pod_range_from_id(*spec);
-			if (*spec != '\0')
-				spec++;
-			for (;*spec;spec++)
-				flags |= spa_pod_flag_from_id(*spec);
+			format = va_arg(args, const char *);
+			t = *format;
+			if (*format != '\0')
+				format++;
+			flags = spa_pod_range_from_id(*format);
+			if (*format != '\0')
+				format++;
+			for (;*format;format++)
+				flags |= spa_pod_flag_from_id(*format);
 
 			spa_pod_builder_push_prop(builder, key, flags);
 
-			if (type == '{' || type == '[')
-				continue;
-
-			format = spec;
+			if (t == '<' || t == '[')
+				goto next;
 
 			n_values = -1;
 	                while (n_values-- != 0) {
-				SPA_POD_BUILDER_COLLECT(builder, type, args);
+				SPA_POD_BUILDER_COLLECT(builder, t, args);
 
 	                        if ((flags & SPA_POD_PROP_RANGE_MASK) == 0)
 					break;
@@ -565,10 +565,11 @@ spa_pod_builder_addv(struct spa_pod_builder *builder,
 			format = va_arg(args, const char *);
 			continue;
 		default:
-			SPA_POD_BUILDER_COLLECT(builder,*format,args);
+			SPA_POD_BUILDER_COLLECT(builder, t, args);
 			break;;
 		}
-		format++;
+		if (*format != '\0')
+			format++;
 	}
 	return spa_pod_builder_deref(builder, builder->frame[builder->state.depth].ref);
 }
diff --git a/spa/include/spa/pod/pod.h b/spa/include/spa/pod/pod.h
index b8a3037ca..d1a1af857 100644
--- a/spa/include/spa/pod/pod.h
+++ b/spa/include/spa/pod/pod.h
@@ -209,16 +209,18 @@ struct spa_pod_fd {
 
 struct spa_pod_prop_body {
 	uint32_t key;
-#define SPA_POD_PROP_RANGE_NONE		0
-#define SPA_POD_PROP_RANGE_MIN_MAX	1
-#define SPA_POD_PROP_RANGE_STEP		2
-#define SPA_POD_PROP_RANGE_ENUM		3
-#define SPA_POD_PROP_RANGE_FLAGS	4
-#define SPA_POD_PROP_RANGE_MASK		0xf
-#define SPA_POD_PROP_FLAG_UNSET		(1 << 4)
-#define SPA_POD_PROP_FLAG_OPTIONAL	(1 << 5)
-#define SPA_POD_PROP_FLAG_READONLY	(1 << 6)
-#define SPA_POD_PROP_FLAG_DEPRECATED	(1 << 7)
+#define SPA_POD_PROP_RANGE_NONE		0	/**< no range */
+#define SPA_POD_PROP_RANGE_MIN_MAX	1	/**< property has range */
+#define SPA_POD_PROP_RANGE_STEP		2	/**< property has range with step */
+#define SPA_POD_PROP_RANGE_ENUM		3	/**< property has enumeration */
+#define SPA_POD_PROP_RANGE_FLAGS	4	/**< property has flags */
+#define SPA_POD_PROP_RANGE_MASK		0xf	/**< mask to select range type */
+#define SPA_POD_PROP_FLAG_UNSET		(1 << 4)	/**< property value is unset */
+#define SPA_POD_PROP_FLAG_OPTIONAL	(1 << 5)	/**< property value is optional */
+#define SPA_POD_PROP_FLAG_READONLY	(1 << 6)	/**< property is readonly */
+#define SPA_POD_PROP_FLAG_DEPRECATED	(1 << 7)	/**< property is deprecated */
+#define SPA_POD_PROP_FLAG_INFO		(1 << 8)	/**< property is informational and is not
+							  *  used when filtering */
 	uint32_t flags;
 	struct spa_pod value;
 	/* array with elements of value.size follows,