Updated: Aug 4, 2020
How to fix videos that were shot horizontally on the iPhone but instead open in Quicktime incorrectly as vertical videos. Includes a simple fix for everyday users, plus an even quicker fix for professional editors and other advanced users.
UPDATE: 08/03/20 .... As of Mac OS Mojave, 10.14.x, Apple has an even easier way to rotate these vertical iPhone videos that sometimes occur (this is for those shots that the iPhone sees as vertical "portrait" mode even though they were shot horizontal, in "landscape" mode).
The new fix can be done at the Finder level when you select the video clip and press the spacebar for a quick preview of the video. You'll see two new icons at the top of the window-- one allows you to automatically rotate the image into the correct view, and the other allows you to go directly into "edit mode" so you can trim the beginning and end of the video right there from within the Finder! You also have the usual option to open the file in Quicktime or the original app that created it, or to share it using a variety of methods.
FOLLOWUP TO ORIGINAL 2018 POST: It has been confirmed that Apple no longer sells registration keys for Quicktime Pro7. However, the installer is still downloadable here: https://support.apple.com/kb/DL923?locale=en_US So if you still have a copy of your original registration code, it should work fine. Check out this link for more info on Quicktime 7 installation, plus a way to search your purchase history for the Quicktime Pro 7 upgrade code you may have already purchased: https://support.apple.com/en-us/HT201691
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