1. Importing from the hard drive: "There is a problem with the video file (1) C0003.MP4"
2. Importing from an SD card: "An unknown error has occurred while reading the video file. Connecting to Dynamic Link server failed. (1) DSCN5681.MOV"
3. Both movies play okay on my PC.
4. Installed Lightroom CC a week ago onto Windows 10, that is up-to-date. Have never been able to import any videos. Lightroom 2015 Release 8. Everything else seems okay.
Please try the steps mentioned below: -
Open Lightroom Preferences and click on the File Handling tab.
At the bottom of the File Handling options, find the Video Cache Settings.
Click the Purge Cache button.
Close the Preferences dialog.