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As more and more apps record audio and video files we need to start thinking about what to do with those files. Playing them back isn't enough. Media files are full of data that developers can start exploiting thanks to an emergent category of signal and natural language processing technologies. Some of these are accessible via developer-friendly APIs.
Media files area extremely rich from a data perspective. Signal processing technologies can be used to extract and interpret words, emotions, identity, objects, events, etc.
Unfortunately, the work coming out of research labs is complicated, and usually difficult to understand. Thankfully, people are working to make it accessible.