I've been experiencing some issues while trying to import videos into Lightroom Classic.
A few days ago I synchronized a folder with some new photos/videos in it. The photos were all recognized and imported into the catalog without a problem.
For the videos, I was unable to see the preview of them during the import dialogue and, after clicking 'Import', I get a dialogue box saying "An unknown error has occurred while reading the video file" accompanied by a list of the video files that could not be read.
The video files are play fine in VLC/MPC. They are .MOV extension encoded in H265. I have imported many such files in the past. Same camera and same settings. Nothing changed.
After a trying to purge my video cache and rename the files, it occurred to me that this issue might have something to my computer not being online. (My broadband connection has been down for a few days.)
After using my mobile to go online and renaming the files (renaming is crucial; it was enough to just add an underscore or change the file extension to mp4), I was able to import the videos as usual.
Today my broadband connection was restored. I created a new video (same camera and settings) and tried importing it and it worked without renaming. (It seems renaming is only needed when the import fails the first time.)
I'm thinking that there might be an issue with the codec for H265 files that prevents it from working as expected when offline. This might be worth looking into.
I'm using Windows 11 Pro 22H2, Lightroom 12.3 and Camera Raw 15.3
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