LR Classic CC 8.3 hangs on Slideshow video export macOS Mojave

I was having a similar issue with LR freezing when exporting a slideshow at 1080p.  I posted the following in another thread, but perhaps it will help others who find this thread:

I have found two ways to WORKAROUND the problem of LR freezing when exporting a slideshow to video at 1080p.  Both of these methods work on my Windows 10 system, but there is no guarantee they will work on other systems.  Note that my slideshow has both landscape and portrait images.

Method 1)  Assuming all of the images for the slideshow are in a collection, export the entire collection at full-size in either JPG or TIFF format, sRGB.  When doing the export, rename the output files using Sequence-Filename.  Next, import these new files back into LR, create a collection of these files and make the slideshow using these files.  Exporting as video at 1080p should work fine.  (The order of the images will match the original slideshow because of using Sequence-Filename when creating the new images.)

Method 2) Assuming all of the images for the slideshow are in a collection, export the collection as a new catalog.  Select the collection, then File > Export As Catalog, checking Export Negative files and Include Available Previews.  Open this new catalog and create the slideshow.  Exporting as video at 1080p should work fine.

On my system, LR crashed intermittently when adding an .MP4 music file to the slideshow.  In Preferences > Performance, turning off Use Graphics Processor allowed me to add the music without the crash.  After the music was added, I could re-enable Use Graphics Processor, but I'm not sure it made anything go faster.  (That's just my system which is a few years old.)

John