Brian,

>> Hi All,
>> 
>> Our Echo system adds a new thumbnail every time there's a new slide/visual 
>> on the screen, but no one thumbnail can represent more than 5 minutes of 
>> video, and I am looking for information on how Matterhorn determines when to 
>> create a new thumbnail slide.   Matterhorn seems to use similar logic, but 
>> I've noticed that thumbnails are not always created, especially if the new 
>> window is not maximized to take up the whole screen.

there is logic in place that determines the beginning of a new segment. The 
code is not easy to get right, and is difficult/impossible to get right for all 
the different use cases. It basically looks at how much has changed on the 
screen as compared to the previous still image, and if that portion is large 
enough *and* the new image remains stable for a certain (configurable) amount 
of time, then that's our new scene.

Tobias
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