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Videos won't open on Quicktime Player on my iMac that were taken from my iphone 10x

This just started happening on my Late 2013 mac with Quicktime player version 10.4. Any ideas on what may be the problem?

Running this configuration:

Posted on May 29, 2019 1:01 PM

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Posted on May 30, 2019 1:16 AM

Your phone may be recording in a newer format that is not compatible with the software on your Mac (H.265 HEVC vs. H.264 AVC).

You can from now on record in a more compatible format. Settings﹥Camera﹥Formats﹥Most Compatible (instead of High Efficiency).
You can have the importing software ask the iPhone to convert on the fly when syncing. Settings﹥Photos (Yes, even for video)﹥Transfer to Mac or PC﹥Automatic. (“Keep Originals” is a bit misleading, as the originals stay where they are in both options; it only affects importing.)

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