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Mostly Objective-C. Media via CoreVideo and AVFoundation. Document persistence through ModelKit (http://github.com/jawngee/ModelKit). UI mostly custom. Beat detection and BPM detection is C++.

Interestingly, everything but UI should compile and work on iOS without much modification. Doubt I will ever take it there, but you never know.

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This is such a brilliant idea! It'd be also interesting to extract other features from videos such as colour profiles , face detection and movements of objects in the frame and camera movements. They don't need to be accurate but hints; then use the profile to control the mood of the video. An example may be,to start of with cool edits at the beginning then gradually progress to the warmer clips.

is the bpm / beat detection home grown code?

Yup.

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