QuickTime Player can't open "Hot Fun (1920 x 1080).m4v-TEMP" because the movie's file format isn't recognized. What gives?
Thanks for using Apple Support Communities.
If you have issues playing media from a third-party device, make sure the software that accompanied the device is installed on your computer.
For more information on this, take a look at this article:
Adding additional media format support to QuickTime
Also try renaming the file to end in .m4v only.
Best of luck,
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