1 files changed, 19 insertions, 0 deletions
diff --git a/source/blender/compositor/operations/COM_MovieClipAttributeOperation.cc b/source/blender/compositor/operations/COM_MovieClipAttributeOperation.cc
index a9f187258b2..e36e93984fb 100644
--- a/source/blender/compositor/operations/COM_MovieClipAttributeOperation.cc
+++ b/source/blender/compositor/operations/COM_MovieClipAttributeOperation.cc
@@ -29,10 +29,21 @@ MovieClipAttributeOperation::MovieClipAttributeOperation()
   this->m_framenumber = 0;
   this->m_attribute = MCA_X;
   this->m_invert = false;
+  needs_resolution_to_get_constant_ = true;
+  is_value_calculated_ = false;
 }
 
 void MovieClipAttributeOperation::initExecution()
 {
+  if (!is_value_calculated_) {
+    calc_value();
+  }
+}
+
+void MovieClipAttributeOperation::calc_value()
+{
+  BLI_assert(this->get_flags().is_resolution_set);
+  is_value_calculated_ = true;
   if (this->m_clip == nullptr) {
     return;
   }
@@ -83,4 +94,12 @@ void MovieClipAttributeOperation::determineResolution(unsigned int resolution[2]
   resolution[1] = preferredResolution[1];
 }
 
+const float *MovieClipAttributeOperation::get_constant_elem()
+{
+  if (!is_value_calculated_) {
+    calc_value();
+  }
+  return &m_value;
+}
+
 }  // namespace blender::compositor