I just released a test version of my motion detection app for Windows here. It analyses hours of videos and presents them as a grid of thumbnails that you can click on to select the in and out frames of any events. It sounds long winded but I can analyse hours of videos in just a few minutes.
Output is to a Shotcut file containing all the events you detected. You can alter the lead-in and lead-out for each event as well as the length of dissolves between events. Great for bird feeders, bees on flowers or anything with intermittent events.