Piero Bosio Social Web Site Personale

My best friend is at a nursing home with a brain tumor. His family asked me to turn his TV into a picture frame when it is not in use. I'v set up an old Intel NUC with #opensuse and #Syncthing to maintain a folder with pictures to be displayed. Can anyone suggest a good #slideshow program?
It must support smooth transitions and automatic startup, and be able to detect if new content is added or removed from the folder. #linux #photography #recommendations