diff --git a/src/backends/meta-screen-cast-area-stream-src.c b/src/backends/meta-screen-cast-area-stream-src.c
index b7de04d7b..91251cc63 100644
--- a/src/backends/meta-screen-cast-area-stream-src.c
+++ b/src/backends/meta-screen-cast-area-stream-src.c
@@ -83,7 +83,7 @@ get_backend (MetaScreenCastAreaStreamSrc *area_src)
   return meta_screen_cast_get_backend (screen_cast);
 }
 
-static void
+static gboolean
 meta_screen_cast_area_stream_src_get_specs (MetaScreenCastStreamSrc *src,
                                             int                     *width,
                                             int                     *height,
@@ -100,6 +100,8 @@ meta_screen_cast_area_stream_src_get_specs (MetaScreenCastStreamSrc *src,
   *width = (int) roundf (area->width * scale);
   *height = (int) roundf (area->height * scale);
   *frame_rate = 60.0;
+
+  return TRUE;
 }
 
 static gboolean
diff --git a/src/backends/meta-screen-cast-monitor-stream-src.c b/src/backends/meta-screen-cast-monitor-stream-src.c
index 6753f176a..008cd6de7 100644
--- a/src/backends/meta-screen-cast-monitor-stream-src.c
+++ b/src/backends/meta-screen-cast-monitor-stream-src.c
@@ -87,7 +87,7 @@ get_monitor (MetaScreenCastMonitorStreamSrc *monitor_src)
   return meta_screen_cast_monitor_stream_get_monitor (monitor_stream);
 }
 
-static void
+static gboolean
 meta_screen_cast_monitor_stream_src_get_specs (MetaScreenCastStreamSrc *src,
                                                int                     *width,
                                                int                     *height,
@@ -112,6 +112,8 @@ meta_screen_cast_monitor_stream_src_get_specs (MetaScreenCastStreamSrc *src,
   *width = (int) roundf (logical_monitor->rect.width * scale);
   *height = (int) roundf (logical_monitor->rect.height * scale);
   *frame_rate = meta_monitor_mode_get_refresh_rate (mode);
+
+  return TRUE;
 }
 
 static void
diff --git a/src/backends/meta-screen-cast-stream-src.c b/src/backends/meta-screen-cast-stream-src.c
index 610679dcc..c3ede8aea 100644
--- a/src/backends/meta-screen-cast-stream-src.c
+++ b/src/backends/meta-screen-cast-stream-src.c
@@ -47,6 +47,14 @@
   (sizeof (struct spa_meta_cursor) + \
    sizeof (struct spa_meta_bitmap) + width * height * 4)
 
+#define DEFAULT_SIZE SPA_RECTANGLE (1280, 720)
+#define MIN_SIZE SPA_RECTANGLE (1, 1)
+#define MAX_SIZE SPA_RECTANGLE (16384, 16386)
+
+#define DEFAULT_FRAME_RATE SPA_FRACTION (60, 1)
+#define MIN_FRAME_RATE SPA_FRACTION (1, 1)
+#define MAX_FRAME_RATE SPA_FRACTION (1000, 1)
+
 enum
 {
   PROP_0,
@@ -107,7 +115,7 @@ G_DEFINE_TYPE_WITH_CODE (MetaScreenCastStreamSrc,
                                                 meta_screen_cast_stream_src_init_initable_iface)
                          G_ADD_PRIVATE (MetaScreenCastStreamSrc))
 
-static void
+static gboolean
 meta_screen_cast_stream_src_get_specs (MetaScreenCastStreamSrc *src,
                                        int                     *width,
                                        int                     *height,
@@ -116,7 +124,7 @@ meta_screen_cast_stream_src_get_specs (MetaScreenCastStreamSrc *src,
   MetaScreenCastStreamSrcClass *klass =
     META_SCREEN_CAST_STREAM_SRC_GET_CLASS (src);
 
-  klass->get_specs (src, width, height, frame_rate);
+  return klass->get_specs (src, width, height, frame_rate);
 }
 
 static gboolean
@@ -694,6 +702,8 @@ on_stream_param_changed (void                 *data,
   MetaScreenCastStreamSrc *src = data;
   MetaScreenCastStreamSrcPrivate *priv =
     meta_screen_cast_stream_src_get_instance_private (src);
+  MetaScreenCastStreamSrcClass *klass =
+    META_SCREEN_CAST_STREAM_SRC_GET_CLASS (src);
   uint8_t params_buffer[1024];
   int32_t width, height, stride, size;
   struct spa_pod_builder pod_builder;
@@ -737,6 +747,9 @@ on_stream_param_changed (void                 *data,
     SPA_PARAM_META_size, SPA_POD_Int (CURSOR_META_SIZE (384, 384)));
 
   pw_stream_update_params (priv->pipewire_stream, params, G_N_ELEMENTS (params));
+
+  if (klass->notify_params_updated)
+    klass->notify_params_updated (src, &priv->video_format);
 }
 
 static void
@@ -884,9 +897,6 @@ create_pipewire_stream (MetaScreenCastStreamSrc  *src,
   int width;
   int height;
   float frame_rate;
-  MetaFraction frame_rate_fraction;
-  struct spa_fraction max_framerate;
-  struct spa_fraction min_framerate;
   const struct spa_pod *params[1];
   int result;
 
@@ -903,24 +913,49 @@ create_pipewire_stream (MetaScreenCastStreamSrc  *src,
       return NULL;
     }
 
-  meta_screen_cast_stream_src_get_specs (src, &width, &height, &frame_rate);
-  frame_rate_fraction = meta_fraction_from_double (frame_rate);
+  if (meta_screen_cast_stream_src_get_specs (src, &width, &height, &frame_rate))
+    {
+      MetaFraction frame_rate_fraction;
+      struct spa_fraction max_framerate;
+      struct spa_fraction min_framerate;
 
-  min_framerate = SPA_FRACTION (1, 1);
-  max_framerate = SPA_FRACTION (frame_rate_fraction.num,
-                                frame_rate_fraction.denom);
+      frame_rate_fraction = meta_fraction_from_double (frame_rate);
 
-  params[0] = spa_pod_builder_add_object (
-    &pod_builder,
-    SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat,
-    SPA_FORMAT_mediaType, SPA_POD_Id (SPA_MEDIA_TYPE_video),
-    SPA_FORMAT_mediaSubtype, SPA_POD_Id (SPA_MEDIA_SUBTYPE_raw),
-    SPA_FORMAT_VIDEO_format, SPA_POD_Id (SPA_VIDEO_FORMAT_BGRx),
-    SPA_FORMAT_VIDEO_size, SPA_POD_Rectangle (&SPA_RECTANGLE (width, height)),
-    SPA_FORMAT_VIDEO_framerate, SPA_POD_Fraction (&SPA_FRACTION (0, 1)),
-    SPA_FORMAT_VIDEO_maxFramerate, SPA_POD_CHOICE_RANGE_Fraction (&max_framerate,
-                                                                  &min_framerate,
-                                                                  &max_framerate));
+      min_framerate = SPA_FRACTION (1, 1);
+      max_framerate = SPA_FRACTION (frame_rate_fraction.num,
+                                    frame_rate_fraction.denom);
+
+      params[0] = spa_pod_builder_add_object (
+        &pod_builder,
+        SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat,
+        SPA_FORMAT_mediaType, SPA_POD_Id (SPA_MEDIA_TYPE_video),
+        SPA_FORMAT_mediaSubtype, SPA_POD_Id (SPA_MEDIA_SUBTYPE_raw),
+        SPA_FORMAT_VIDEO_format, SPA_POD_Id (SPA_VIDEO_FORMAT_BGRx),
+        SPA_FORMAT_VIDEO_size, SPA_POD_Rectangle (&SPA_RECTANGLE (width,
+                                                                  height)),
+        SPA_FORMAT_VIDEO_framerate, SPA_POD_Fraction (&SPA_FRACTION (0, 1)),
+        SPA_FORMAT_VIDEO_maxFramerate,
+          SPA_POD_CHOICE_RANGE_Fraction (&max_framerate,
+                                         &min_framerate,
+                                         &max_framerate));
+    }
+  else
+    {
+      params[0] = spa_pod_builder_add_object (
+        &pod_builder,
+        SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat,
+        SPA_FORMAT_mediaType, SPA_POD_Id (SPA_MEDIA_TYPE_video),
+        SPA_FORMAT_mediaSubtype, SPA_POD_Id (SPA_MEDIA_SUBTYPE_raw),
+        SPA_FORMAT_VIDEO_format, SPA_POD_Id (SPA_VIDEO_FORMAT_BGRx),
+        SPA_FORMAT_VIDEO_size, SPA_POD_CHOICE_RANGE_Rectangle (&DEFAULT_SIZE,
+                                                               &MIN_SIZE,
+                                                               &MAX_SIZE),
+        SPA_FORMAT_VIDEO_framerate, SPA_POD_Fraction (&SPA_FRACTION (0, 1)),
+        SPA_FORMAT_VIDEO_maxFramerate,
+          SPA_POD_CHOICE_RANGE_Fraction (&DEFAULT_FRAME_RATE,
+                                         &MIN_FRAME_RATE,
+                                         &MAX_FRAME_RATE));
+    }
 
   pw_stream_add_listener (pipewire_stream,
                           &priv->pipewire_stream_listener,
diff --git a/src/backends/meta-screen-cast-stream-src.h b/src/backends/meta-screen-cast-stream-src.h
index 08c181534..456b5bd97 100644
--- a/src/backends/meta-screen-cast-stream-src.h
+++ b/src/backends/meta-screen-cast-stream-src.h
@@ -53,10 +53,10 @@ struct _MetaScreenCastStreamSrcClass
 {
   GObjectClass parent_class;
 
-  void (* get_specs) (MetaScreenCastStreamSrc *src,
-                      int                     *width,
-                      int                     *height,
-                      float                   *frame_rate);
+  gboolean (* get_specs) (MetaScreenCastStreamSrc *src,
+                          int                     *width,
+                          int                     *height,
+                          float                   *frame_rate);
   void (* enable) (MetaScreenCastStreamSrc *src);
   void (* disable) (MetaScreenCastStreamSrc *src);
   gboolean (* record_to_buffer) (MetaScreenCastStreamSrc  *src,
@@ -74,6 +74,9 @@ struct _MetaScreenCastStreamSrcClass
                               MetaRectangle           *crop_rect);
   void (* set_cursor_metadata) (MetaScreenCastStreamSrc *src,
                                 struct spa_meta_cursor  *spa_meta_cursor);
+
+  void (* notify_params_updated) (MetaScreenCastStreamSrc   *src,
+                                  struct spa_video_info_raw *video_format);
 };
 
 void meta_screen_cast_stream_src_close (MetaScreenCastStreamSrc *src);
diff --git a/src/backends/meta-screen-cast-window-stream-src.c b/src/backends/meta-screen-cast-window-stream-src.c
index 014a97c32..3fa932b4b 100644
--- a/src/backends/meta-screen-cast-window-stream-src.c
+++ b/src/backends/meta-screen-cast-window-stream-src.c
@@ -275,7 +275,7 @@ capture_into (MetaScreenCastWindowStreamSrc *window_src,
   return TRUE;
 }
 
-static void
+static gboolean
 meta_screen_cast_window_stream_src_get_specs (MetaScreenCastStreamSrc *src,
                                               int                     *width,
                                               int                     *height,
@@ -287,6 +287,8 @@ meta_screen_cast_window_stream_src_get_specs (MetaScreenCastStreamSrc *src,
   *width = get_stream_width (window_src);
   *height = get_stream_height (window_src);
   *frame_rate = 60.0f;
+
+  return TRUE;
 }
 
 static gboolean