diff --git a/gst-libs/gst/audio/gstaudiometa.c b/gst-libs/gst/audio/gstaudiometa.c
index b00b777826..51a6f8b2ed 100644
--- a/gst-libs/gst/audio/gstaudiometa.c
+++ b/gst-libs/gst/audio/gstaudiometa.c
@@ -46,7 +46,7 @@ gst_audio_downmix_meta_free (GstMeta * meta, GstBuffer * buffer)
   }
 }
 
-static void
+static gboolean
 gst_audio_downmix_meta_transform (GstBuffer * dest, GstMeta * meta,
     GstBuffer * buffer, GQuark type, gpointer data)
 {
@@ -56,6 +56,8 @@ gst_audio_downmix_meta_transform (GstBuffer * dest, GstMeta * meta,
   gst_buffer_add_audio_downmix_meta (dest, smeta->from_position,
       smeta->from_channels, smeta->to_position, smeta->to_channels,
       (const gfloat **) smeta->matrix);
+
+  return TRUE;
 }
 
 /**
diff --git a/gst-libs/gst/video/gstvideometa.c b/gst-libs/gst/video/gstvideometa.c
index 669c011887..67f0d2b20f 100644
--- a/gst-libs/gst/video/gstvideometa.c
+++ b/gst-libs/gst/video/gstvideometa.c
@@ -19,7 +19,7 @@
 
 #include "gstvideometa.h"
 
-static void
+static gboolean
 gst_video_meta_transform (GstBuffer * dest, GstMeta * meta,
     GstBuffer * buffer, GQuark type, gpointer data)
 {
@@ -45,6 +45,7 @@ gst_video_meta_transform (GstBuffer * dest, GstMeta * meta,
       dmeta->stride[i] = smeta->stride[i];
     }
   }
+  return TRUE;
 }
 
 /* video metadata */
@@ -287,7 +288,7 @@ gst_video_meta_unmap (GstVideoMeta * meta, guint plane, GstMapInfo * info)
   return meta->unmap (meta, plane, info);
 }
 
-static void
+static gboolean
 gst_video_crop_meta_transform (GstBuffer * dest, GstMeta * meta,
     GstBuffer * buffer, GQuark type, gpointer data)
 {
@@ -302,6 +303,7 @@ gst_video_crop_meta_transform (GstBuffer * dest, GstMeta * meta,
     dmeta->width = smeta->width;
     dmeta->height = smeta->height;
   }
+  return TRUE;
 }
 
 const GstMetaInfo *