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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)

  • I have the same problem. Found out later the error code is "-12769". – b.ben May 4 at 5:36
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Not an actual answer. But inform some important piece of information.

I encounter the same problem. The error code is "-12769"

Found out that there are some input videos which worked.

And when I compare both info of videos.

A video that's work :

Good video

A video that's doesn't :

Bad video

The only difference is encoding software between Lavf57.19.100 vs Lavf58.12.100

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