First I didn't relized it, but all my captured DV scences have 2 frames at the end, which belong to the following scence.
I used a Canon MV-200 and a Panasonic NV-280 (both MiniDV cameras) for capturing and scence detection by timecode.
I think I can exclude them for being responsible - they work excelent with iMovies (Mac) and Pinnacle (Win).
Then I found the Device Control Preferences and thought that's it!
But unfortunately, the timecode offset (positive or negative) has no effect on the sence detection.
Hmmm, now I running out of ideas and the resources about these settings are very rare.
Retrieving data ...