Rotating videos

If you're using MacOS, goto Finder, right-click on the file, and under "Quick Actions" select "rotate left" (do this 3 times to rotate right). Lightroom immediately detects the change.

"maybe one time Adobe integrates that functionality directly in LRC...?"

Please add your constructive opinion to this feature request:
https://feedback.photoshop.com/conversations/lightroom-classic/lightroom-ability-to-rotate-videos/5f5f45054b561a3d422f6d2c 

and be sure to click Like and Follow at the bottom of the first post. That will make it a little more likely that Adobe will consider implementing the feature and you'll be notified when they do. (Product developers don't read this forum and won't see your feedback.)

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Just found an simple workaround.
! It works from Mac OSX 10.14 Mojave and newer.

1. select Video in Lightroom Classic

2. Right-Click/"show in Finder" or Menu "Photo/show in Finder" or cmd+R

> You will be taken to the Finder and the Video File will be selectet

3. make sure you're in "columns view", cmd+3 or Menu "View/as column"

4. Finder's "columns view" will show you a Preview of the Video File on the far right side

5. on the bottom of that Preview you'll see a few tools available, the first one should be "rotate left"

6. Use that "rotate left" Tool as many times as you need until the Video is shown the right way around (horizontal)

7. go back to LRC, notice that LRC does not update the new "Rotated state" itself. Here's how to fix that...

8. ...in LRC select that rotated Video

9. Right-Click/"remove Photo" or hit the delete key

10. only "remove from catalog", do NOT "delete from disk"!

11. Re-Import the rotatet Video File into LRC ("import..." or Menu "File/import Photos and Videos..." or drag and drop Video onto LRC-Icon or Menu "library/synchronize Folder")

> the Re-Importet Photo should now be back in LRC shown in the correct rotation.

cheers!

PS: maybe one time Adobe integrates that functionality directly in LRC...?

I have the same problem. Seems silly not to have a feature to rotate video in such a complex editing program, even my phone can do that!  I was planning to transition from Apple Photos, but some of these simpler task for other media not being included is frustrating.  I do not need to do major edits to video in Lightroom, but would like to be able to do simple tasks in one place for posting on the web and sharing.

Also quick time

How to Rotate or Flip Videos in Mac OS X

1. Open the video or movie file you wish to rotate into QuickTime Player in Mac OS X.
3. Go to the “Edit” menu and choose one of the following rotation options for the video:
5. Save the newly edited rotated video as usual by hitting Command+S or by going to File and “Save”

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How to Rotate Videos in Mac OS X - OS X Daily

osxdaily.com/2016/02/01/rotate-video-mac-os-x/