Failed due to MOV file "not readable

Make sure that Compressor has Full Disk Access in System Settings->Privacy & Security.

Re: "Failed due to MOV file "not readable : " ... trying to figure out why Compressor can't read and then convert to Prores 422HQ or 444. "

Commiserations on your plight! Although I am no expert in this area, your post to the community deserves some response. If you are still looking for answers: at the least we may provide more opportunity for others with the expertise to share their experience.

I understand the .mov file extension format that compressor finds unreadable, was developed by Apple, and is generally associated with "QuickTime".

Wondering if the version you are you using is Compressor 4.10:

(else perhaps may need updating ?)

The Compressor User Guide - Apple Support provides helpful articles:

Eg: For Compressor 4.10

Import video and audio in Compressor - Apple Support

says:

:When you import source media to Compressor, you create a transcoding job to which you can add multiple presets or destinations that specify how your media will be transcoded."

and

"After you import source media, you can view and modify job properties, apply transcoding instructions, and transcode the batch."

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If the assistance you need does not appear in this thread: you may want to try reaching out to Compressor — Official Apple Support

Eg: There is a "Get Support - start now" link at the bottom of their website (link above).

Thank you for your replies, Leif M. good to know you solved the issue!

Also: Thank you kindly to Luis Sequeira1 for joining the discussion and sharing your expert suggestion!