Non linked video (anyway in file folder).
Load slide with background and after that video which shortly shows diagonal → disappears → starts correct. Quite awful to see.
Tried delaying video 1 sec → same behavior.
This on Win 11, no issue with Win 7 (of course same LO version).
Video is mp4 which is viewable only if K-Lite-Codepack installed. At inserting image, Impress says unreadable format.
