Methods and apparatus for media source identification and time shifted media consumption measurements are disclosed. A disclosed method identifies a media source by generating first signature information based on media presented via a media delivery device and comparing the first signature information to second signature information. The second signature information is derived from a library of signature information local to the media delivery device. The disclosed method generates a collection of matching signature information based on the comparison of the first and second signature information, and identifies a source of the media presented via the media delivery device based on the collection of matching signature information.