does anyone know of a simple webcam program that can support multiple cameras and support 1 buttons trigger to record that has pre-event recording say 10-15 sec before button press?
I'm not sure what you mean by pre-event recording.
You cannot do pre-event recording before a button press, this implies that you must know the future. (if i understood you correctly)
I recalled theres a program called Captured! search on the forum you'll find it. It is a very good software the last time i tried it.
You can keep a 10-15sec buffer constantly, and when you hit the button save the buffer.
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I know Panasonic makes a dash cam for cops that does this, perhaps they have software that will run on an MDT to do the same? worth a look. The cam is part of their toughbook series.