Metadata extractors for the file abstraction layer (FAL) 

Deprecated since version 14.0

If a class implements ExtractorInterface , registration of Metadata extractors happens automatically. No further registration is necessary.

The method TYPO3\CMS\Core\Resource\Index\ExtractorRegistry::registerExtractionService() has been marked as deprecated. The call in ext_localconf.php can be removed.

Metadata extractors are service classes that are automatically executed whenever an asset / file is added to FAL storage or when FAL indexing is executed.

If \TYPO3\CMS\Core\Resource\Index\ExtractorInterface is implemented by a class, registration of Metadata extractors happens automatically. This is due to autoconfigure tagging by the Symfony Dependence Injection framework.