Embodiments receive {TAIL ~ multimedia data}, detect portions having specified features, and output {HEAD ~ a corresponding subset} of the multimedia data 
Embodiments receive { TAIL ~ multimedia data } , detect portions having specified features , and output { HEAD ~ a corresponding subset } of the multimedia data
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH