--- a/src/multimedia/video/qvideoframeformat.cpp
+++ b/src/multimedia/video/qvideoframeformat.cpp
@@ -19,6 +19,8 @@
 
 QT_BEGIN_NAMESPACE
 
+constexpr int QVideoFrameFormat::NPixelFormats;
+
 class QVideoFrameFormatPrivate : public QSharedData
 {
 public:
--- a/src/multimedia/qmediametadata.cpp
+++ b/src/multimedia/qmediametadata.cpp
@@ -15,2 +15,4 @@
 QT_BEGIN_NAMESPACE
+
+constexpr int QMediaMetaData::NumMetaData;