Movie Render Graph - Metadata Scripting

Development Programming & Scripting
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1

I’m trying to access and change Metadata Attributes from the Set Metadata Attributes node in Movie Render Graph using Python scripting.

スクリーンショット 2025-05-23 152156
スクリーンショット 2025-05-23 1521561704×928 112 KB

I can access the array of Metadata Attributes and append to it but I don’t know how I can modify already existing attributes.

Here is how I’m trying to do it :

# Get Metadata Attribute Collection
metadata_attributes_node.set_editor_property("override_metadata_attribute_collection", True)
metadata_collection = metadata_attributes_node.get_editor_property("metadata_attribute_collection")

#Get Metadata Attribute Array From Collection
metadata_attributes = metadata_collection.get_editor_property("metadata_attributes")

# Check Actual Attributes
unreal.log("Attributes before change :")
for attribute in metadata_attributes:
    unreal.log(attribute.get_editor_property("name"))
    unreal.log(attribute.get_editor_property("value"))

metadata_attributes.append(unreal.MovieGraphMetadataAttribute("New Attribute", "2", True))
metadata_attributes[0].set_editor_property("name", "New Name")
metadata_attributes[0].set_editor_property("value", "New Value")

# Check Attributes After Change
unreal.log("Attributes after change :")
for attribute in metadata_attributes:
    unreal.log(attribute.get_editor_property("name"))
    unreal.log(attribute.get_editor_property("value"))

And what I get as a result :

LogPython: Attributes before change :
LogPython: First Attribute
LogPython: First Value
LogPython: Attributes after change :
LogPython: First Attribute
LogPython: First Value
LogPython: New Attribute
LogPython: 2

I’m new to Python and Unreal scripting so I thought it might be a basic error like accessing a copy instead of the object reference but I don’t know how to check.