Hi!

I made a 1920x1080 picture every minute for the last 3 years of the construction of my house by my CCTV camera - in total its abt 320GB of photos (abt 400.000).

Unfortunately, my camera made a subfolder for every day, hour and minute - so all of the 400.000 pics are in single folders. Windows explorer is just crashing if I try to move/rename/whatever the pics - anyone has an Idea how to deal with that?

You think lrtimelapse is capable of doing 400k pics?

Thanks in advance, Alfred

LRTimelapse is specified to work with sequences up to 15.000 images, see https://lrtimelapse.com/eula/
With your small images, more should be possible, but it will get hard to work with the curves etc in LRT.

You'd need to process such a timelapse in Chunks.
What you shot there has a total run time of nearly 4 hours when played back with 30fps.
You need to do some clever filtering to reduce the number of images. Working in batches of 10000 images would be a good approach.

In any case, watch my tutorial about editing long term timelapse with LRTimelapse Pro, see https://lrtimelapse.com/tutorial/advanced/ (the last one on the page).

To bring all of these files into one folder you could for example try to use the LRTimelapse importer. It will scan all subfolders and import them to a new folder. However, I've never tested it with so many images.
Another way would be to use windows terminal and a move or copy command (google how to do that).