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I've edited an MP4 movie file in Quicktime Player Version 10.5.

When I try to save the edited file, I get: The operation could not be completed.

Does anyone know what causes this and/or how it can be solved?

macOS Mojave 10.14.2 / Quicktime Player 10.5 / MacBook Pro (Retina, 13-inch, Early 2015)

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