P: Videos do not play or import macOS High Sierra

I have tried that in the past with no luck.   I thought the problem was resolved but it returned.    Seems randon on what videos it likes and does not like.

deinstall ALL adobe files, run adobe cleaner, delete ALL adobe files even in library's, computer restart, download and install Creative cloud, install apps - 
everything works fine again.

waiting for the next bug ;-))

Same Problem on Mac high Sierra. No import of Videofilm in LR classics  (Pics work fine) and also in Bridge no videos shown - Message: Das Herstellen einer Verbindung zu Dynamic Link-Server ist fehlgeschlagen.
how to re-connect to the Dynamic Link-Server and get this fixed?

I have the same problem. I went from Yosemite & Lightroom 5 to High Sierra & Lightroom Classic CC. Pictures works fine. Videos that aren't MTS (AVCHD) works well too. As for MTS video the thumbnail is gone and shows exclamation mark to its side. When clicked the message "Lightroom has encountered problems reading this video" appears.

I have the same problem. I went from Yosemite & Lightroom 5 to High Sierra & Lightroom Classic CC. Pictures works fine. Videos that aren't MTS (AVCHD) works well too. As for MTS video the thumbnail is gone and shows exclamation mark to its side. When clicked the message "Lightroom has encountered problems reading this video" appears.

This continues to be a ongoing issues with Lightroom 7.1.   I have not seen any resolution to this issue.   Lightroom 5 and 6 work fine with Mac OSX High Sierra.    I have tried every suggestion I have seen on this forum.  The only partial short term remedy seems to be Force Quit Lightroom and then it works for a short bit and then starts to fail again.

@11095136 -- I will mail you regarding this issue. Seems there is some issue with permissions on your system, this looks like OS specific.

I did boot into safe mode, but was not able to import or preview video in LR
here is unfiltered log
https://www.dropbox.com/s/hc2jt9n4zlp2678/LR-test3-safeMode.txt?dl=0

Restarted again without safe mode and nothing has changed
unfiltered log is here
https://www.dropbox.com/s/9agvhdr06pbda0g/LR-test4-restartAfterSafeMode.txt?dl=0

@11095136 -- for more investigation I will send an email to you, however before that, can you try opening Mac in Safe Mode, and do Video Import. Looks like mdworker is facing some issue. Please try to reboot your system in Safe Mode. http://jaybarn.es/docs/osx_error_fix/ -- this link have some instructions.

Thank you for your response Reetesh,
How should the permission look like? Who should have permission to do what?
When I look in info window in finder, I as user have read-write permissions on all folders and files on this path.

This catalog is you are pointing at is actully an old catalog from previous LR.

Anyway I tried to open LRCCC, found sandboxed preview file, run that sudo command on it but nothing has changed. After opening LR again sandbox comes again.

As I say, I'm not a programmer so I may be misunderstanding something.
Here is the log from that activity.

https://www.dropbox.com/s/209i6jtsfnch6ar/LR-test2.txt?dl=0

Thanks