audio video search
Some video search is performed using human powered search, others create technological systems that work automatically to detect what is in the video and match the searchers needs. You can do Audio Video Search and Play on the PlayAudioVideo search engine. Many efforts to improve video search including both human powered search as well as writing algorithm that recognize what's inside the video have meant complete redevelopment of search efforts. Much more, including Audio Search and Play and images on the PlayAudioVideo search engine.
It is generally acknowledged that visual search into video does not work well and that no company is using it publicly. Video Search and Play is easily done on the PlayAudioVideo search engine. Researchers at UC San Diego and Carnegie Melon University have been working on the visual search problem for more than 15 years, and admitted at a "Future of Search" conference at UC Berkeley in the Spring of 2007 that it was years away from being viable even in simple search. Also, try Audio Video Search and Play on the PlayAudioVideo search engine.
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Parts of text from: Wikipedia