> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.nvidia.com/holoscan/sdk-user-guide/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.nvidia.com/holoscan/sdk-user-guide/_mcp/server.

# holoscan::encode_metadata_dictionary_payload

> Encode a MetadataDictionary into a self-contained byte blob.

```cpp showLineNumbers={false}
expected<std::vector<uint8_t>, RuntimeError> holoscan::encode_metadata_dictionary_payload(
    const MetadataDictionary &metadata
)
```

Encode a [MetadataDictionary](../classes/metadatadictionary) into a self-contained byte blob.

Wire format: \[entry\_count: u32] per entry: \[key\_size: u32] \[codec\_name\_size: u32] \[payload\_size: u32] \[key bytes] \[codec\_name bytes] \[payload bytes]