phillipberndt
commented
4 years ago Backends aren't currently aware of thumbnailing, they're just asked to draw a freshly loaned file into a small buffer. For movies, that's an empty one most of the time.
I'll see if I can come up with a good way to work around this.
for me (pqiv 2.11 on debian) thumbnails of video files are always a "chess board". even if i provide correct thumbs via XDG_CACHE_DIR they are overwritten...