From: stuff overlay maintainer
Subject: Guard audio-sink g_object_set against backends without that property

wxMediaCtrl2 reaches into wxGStreamerMediaBackend's m_playbin and
sets audio-sink=NULL to silence audio. wx 3.2's GTK media library
uses the higher-level gst_player_* API, so m_playbin is a
GstPlayer wrapper rather than a classic playbin GstElement;
GstPlayer does not expose an audio-sink property and GLib logs a
GLib-GObject-CRITICAL on every wxMediaCtrl2 construction.

Functionally the call was already a silent no-op (the property
doesn't exist, so g_object_set() returned without changing
anything); only the noise needs fixing. Guard the call with
g_object_class_find_property() so the property-set is skipped
when the backend doesn't expose it. Same behaviour, no warning.

Bambu printer camera streams have no audio track, so the missing
mute is not a real regression on the affected backends.

--- a/src/slic3r/GUI/wxMediaCtrl2.cpp
+++ b/src/slic3r/GUI/wxMediaCtrl2.cpp
@@ -43,9 +43,11 @@
 #ifdef __LINUX__
     /* Register only after we have created the wxMediaCtrl, since only then are we guaranteed to have fired up Gstreamer's plugin registry. */
     auto playbin = reinterpret_cast<wxGStreamerMediaBackend *>(m_imp)->m_playbin;
-    g_object_set (G_OBJECT (playbin),
-                  "audio-sink", NULL,
-                   NULL);
+    if (g_object_class_find_property(G_OBJECT_GET_CLASS(playbin), "audio-sink")) {
+        g_object_set (G_OBJECT (playbin),
+                      "audio-sink", NULL,
+                       NULL);
+    }
     gstbambusrc_register();
     Bind(wxEVT_MEDIA_LOADED, [this](auto & e) {
         m_loaded = true;