A method and system to provide enclosures, the method including formatting a content feed to include one or more enclosures referencing alternative formats of a content item, wherein at least one of said enclosures includes codec information added to a type field; and providing the content feed to a device via a network. Further, a method and device that receives a content feed, the method including receiving a content feed with multiple enclosures, the multiple enclosures including at least a primary enclosure and an alternative enclosure, wherein the primary enclosure references a primary format for a content item and the alternative enclosure references an alternate format for the content item; upon determining that a player does not support the primary format, checking whether the player supports the alternative format; and if the player supports the alternative format, downloading the content item using a reference included in the alternative enclosure.