Comment 3 for bug 1788636

Happy to pick up on this bug, I have the same.
Impress either hangs indefinitely or closes instantly whenever I try to insert a video.
Images are fine.

I can play the offending videos outside of Impress with no issues.

Libre Office version:
Version: 6.0.6.2
Build ID: 1:6.0.6-0ubuntu0.18.04.1
CPU threads: 8; OS: Linux 4.15; UI render: default; VCL: gtk3;
Locale: en-US (en_US.UTF-8); Calc: group

Here's the backtrace
warning: Currently logging to gdbtrace.log. Turn the logging off and on to make the new setting effective.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fb769c88700 (LWP 13215)]
[New Thread 0x7fb764fc8700 (LWP 13217)]
[New Thread 0x7fb75ffff700 (LWP 13218)]
[New Thread 0x7fb75f7fe700 (LWP 13219)]
[New Thread 0x7fb75effd700 (LWP 13220)]
[Thread 0x7fb764fc8700 (LWP 13217) exited]
[Thread 0x7fb769c88700 (LWP 13215) exited]
[Thread 0x7fb75f7fe700 (LWP 13219) exited]
[Thread 0x7fb75ffff700 (LWP 13218) exited]
[Thread 0x7fb782f286c0 (LWP 13209) exited]
[Inferior 1 (process 13209) exited normally]
/usr/lib/libreoffice/program/gdbtrace:9: Error in sourced command file:
No stack.
Starting program: /usr/lib/libreoffice/program/soffice.bin --backtrace
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fe92686e700 (LWP 13226)]
[New Thread 0x7fe921bae700 (LWP 13228)]
[New Thread 0x7fe9211a0700 (LWP 13229)]
[New Thread 0x7fe92099f700 (LWP 13230)]
[New Thread 0x7fe913fff700 (LWP 13231)]
[Thread 0x7fe921bae700 (LWP 13228) exited]
[Thread 0x7fe92686e700 (LWP 13226) exited]
[Thread 0x7fe92099f700 (LWP 13230) exited]
[Thread 0x7fe9211a0700 (LWP 13229) exited]
[Thread 0x7fe93fb0e6c0 (LWP 13224) exited]
[Inferior 1 (process 13224) exited normally]