Created attachment 176764 [details]
soffice --backtrace

Most video formats I try to insert in LibreOffice Impress results in instant crash. The failing formats includes avi, mkv, mp4, mov, ogv. There is one format which works properly: a very old format named mpg with a special codec which also generates very bad looking videos.
The exact codec to use when transcoding in ffmpeg is mp2 audio and mpeg1video, attempting to use mpeg2video also results in instant crash.
There are many formats I couldn't try due to missing profiles: many formats do not support 1280x720 or 2560x1440 formats.

I have attached a gdbtrace.log generated by soffice --backtrace.

Considering the log points into iHD_dri_video.so I though maybe Intel can't write proper video drivers and so I've attempted to run soffice --backtrace with NVIDIA prime offloading this resulted in the exact same dump.
Due to the dgpu not powering back to d0 when LO initialized I thought LO is ignores dgpu anyway and so I've rebooted completely in NVIDIA exclusive mode where all apps are forced to dgpu and even in this mode LO produced the exact same dump it just ran a bit longer but in the end still produced the exact same dump.

This may be related to https://bugs.documentfoundation.org/show_bug.cgi?id=143961 except that in this report I have included a gdbtrace and additionally one variant of mpg format still works.

Also the version I use does not exist in the dropdown: 7.1.7.2 / LibreOffice Community.