diff --git a/package/qt6/qt6multimedia/Config.in b/package/qt6/qt6multimedia/Config.in
index ae555f98ea..3107caa597 100644
--- a/package/qt6/qt6multimedia/Config.in
+++ b/package/qt6/qt6multimedia/Config.in
@@ -38,6 +38,11 @@ config BR2_PACKAGE_QT6MULTIMEDIA_FFMPEG
 	select BR2_PACKAGE_FFMPEG_SWSCALE
 	select BR2_PACKAGE_QT6BASE_CONCURRENT
 	select BR2_PACKAGE_QT6MULTIMEDIA_PULSEAUDIO
+	# libxext/libxrandr are needed for ffmpeg plugin to build with
+	# X11 support:
+	# https://code.qt.io/cgit/qt/qtmultimedia.git/tree/src/plugins/multimedia/ffmpeg/CMakeLists.txt?h=6.8.1#n198
+	select BR2_PACKAGE_XLIB_LIBXEXT if BR2_PACKAGE_XORG7
+	select BR2_PACKAGE_XLIB_LIBXRANDR if BR2_PACKAGE_XORG7
 	help
 	  This option enables ffmpeg media backend.
 
diff --git a/package/qt6/qt6multimedia/qt6multimedia.mk b/package/qt6/qt6multimedia/qt6multimedia.mk
index 98ab2ec4be..c2a9d250cf 100644
--- a/package/qt6/qt6multimedia/qt6multimedia.mk
+++ b/package/qt6/qt6multimedia/qt6multimedia.mk
@@ -66,6 +66,12 @@ endif
 ifeq ($(BR2_PACKAGE_QT6MULTIMEDIA_FFMPEG),y)
 QT6MULTIMEDIA_CONF_OPTS += -DFEATURE_ffmpeg=ON
 QT6MULTIMEDIA_DEPENDENCIES += ffmpeg
+# libxext/libxrandr are needed for ffmpeg plugin to build with X11
+# support:
+# https://code.qt.io/cgit/qt/qtmultimedia.git/tree/src/plugins/multimedia/ffmpeg/CMakeLists.txt?h=6.8.1#n198
+ifeq ($(BR2_PACKAGE_XORG7),y)
+QT6MULTIMEDIA_DEPENDENCIES += xlib_libXext xlib_libXrandr
+endif
 else
 QT6MULTIMEDIA_CONF_OPTS += -DFEATURE_ffmpeg=OFF
 endif