I followed the recommended configuration in this very good article:
After making those config changes I deleted all existing previews (files and database entries) and started the initial preview generation using the occ command.
Very good results (much faster generation, way less storage needed), BUT:
- before optimization: roughly 14.000 elements (folders containing individual preview files in the preview folder)
- after optimization: roughly only 6.000 elements
Result: for many many files (14k-6k = almost 8k) there´s no preview at all, doesn´t matter which size. They´re also not created on the fly. Very annoying!
How can I tweak the optimization settings to create previews for all files (again)?