# Extract Metadata for Stream Filtering

To extract metadata for stream filtering

1. Optionally, set the input source using the `SetInputSource(System.IO.Stream input)` method of the `Filter` object.
2. If the input source was set in step 1, call the `GetSummaryInfo()` method of the `Filter` object to retrieve an object of the `SummaryInfo` class. Otherwise, call the `GetSummaryInfo(System.IO.Stream in)` method.
3. Use the methods of the `SummaryInfo` object to retrieve the metadata information.

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