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Legacy video codecs are also removed. https://support.apple.com/en-in/HT209029

I about to post a reply complaining about this, but then I looked at the list. Were any of these formats previously supported by modern QuickTime? I know DivX, for example, was unsupported even as far back as Snow Leopard (unless Perian was installed).

Is this referring to QuickTime 7, the separate download?

Yes:

> These incompatible media files were typically created using formats or codecs that rely on QuickTime 7—an older version of QuickTime that is included in macOS Mojave for compatibility purposes. However, because versions of macOS after macOS Mojave will no longer include the QuickTime 7 framework, you’ll first need to detect and convert incompatible media files to continue to use those files in iMovie.

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