gives error:
<?xml version="1.0"?>
<api servedby="mw1119">
<error code="internal_api_error_MWException" info="Exception Caught: Internal error in ApiFormatXml::recXmlPrint: (derivatives, ...) has integer keys without _element value. Use ApiResult::setIndexedTagName()." xml:space="preserve" />
</api>
Version: unspecified
Severity: normal
URL: https://commons.wikimedia.org/w/api.php?action=query&titles=File:Folgers.ogv&prop=videoinfo&viprop=derivatives&format=xmlfm