A simple macOS QuickLook plugin to generate thumbnails and previews of DPX files.
Copy QLDPX.qlgenerator into ~/Library/QuickLook or /Library/QuickLook.
It is likely that no UTI has been declared for DPX files on your system. To work around this, the Document Content Type UTIs entry in Info.plist is set to public.item and the given file's extension is checked for .dpx. As a result, the QLDPX generator may be called more often than is necessary. If you want to avoid this, replace public.item with the UTI for DPX files on your system and rebuild.
See here how to check a file's UTI.