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mp4 files QuickLook got broken


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I had an (almost) perfectly working hack, but then at some point I found mp4 files preview in Finder no longer works. It just rolls a circle but won't start. Other file types are not affected.

Last changes I made before it broke were installing FCPX + Compressor + Pro Video Formats and then Xcode.

 

I tried different troubleshooting tips but nothing worked. My backup 10.13 system still work just fine with the same EFI.

 

This is an output I get in terminal:

 

 qlmanage -p /Volumes/RAID/Video/_Export/video.mp4 

 

Testing Quick Look preview with files:
    /Volumes/RAID/Video/_Export/video.mp4
objc[821]: Class QLMediaTranscoding is implemented in both /System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/QuickLookUI.framework/Versions/A/PlugIns/Music.qldisplay/Contents/MacOS/Music (0x10e0c80c0) and /System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/QuickLookUI.framework/Versions/A/PlugIns/Movie.qldisplay/Contents/MacOS/Movie (0x10e0fa110). One of the two will be used. Which one is undefined.

 

objc[821]: Class QLMediaExportWindowController is implemented in both /System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/QuickLookUI.framework/Versions/A/PlugIns/Music.qldisplay/Contents/MacOS/Music (0x10e0c8110) and /System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/QuickLookUI.framework/Versions/A/PlugIns/Movie.qldisplay/Contents/MacOS/Movie (0x10e0fa250). One of the two will be used. Which one is undefined.

 

Anyone knows how to fix that ?

Edited by writyper

...and this is how I fixed this:

 

How to rebuild the LaunchServices database 
If your "Open With" menu shows applications that are no longer installed, or shows some of them as duplicates, you can use the following Terminal command to rebuild your LaunchServices database:
/System/Library/Frameworks/ApplicationServices.framework/\
Frameworks/LaunchServices.framework/Support/lsregister \
-kill -r -domain local -domain system -domain user

 

source: http://hints.macworld.com/article.php?story=20031215144430486 

 

case closed.

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