I need something that can look into the human-visible contents of image or video files and tell me about likely duplicates. Matching on file name, byte contents, size, etc. is not good enough.
For images, I've tried Visipics and Awesome Duplicate Photo Finder. They're OK for finding near-exact matches.
But they miss a lot of matches where the difference is cropping: in other words, a human looking at 2 images can see that one crops or overlaps another making them conceptually the same, but Visipics or ADPF will not see the match. What other app would be good?
And for finding video content matches, I have no idea. Last time I checked, apps only matched on file byte contents (not very useful). What content matching app would be good for video?