Hi,
It might be useful to have a possibility to skip first and last X seconds of video when generating preview.

Hi,

it already won't ever use first / last seconds.

If it's a long video file it won't use the last 10 minutes at all to avoid spoilers.

Unless your video is like 2 minutes and you are generating 20 images, then it's not really possible to avoid them.

Also it automatically ignores black / dark frames as well.