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I found that the default maximum file size for generating previews was 1 MB on my system. Since many videos are bigger than that, I wasn't getting thumbnails for them. To solve this problem, go into the file manager, Edit> Preferences> Preview> Change "Only for files smaller than" to something bigger.

Source: https://bbs.archlinux.org/viewtopic.php?pid=1316130#p1316130