I just installed Xubuntu 19.10 and mythtv-frontend version 30 from from PPA even if there was somewhat older version 30 in Multiverse repository. I took me long time to find out why playback jerks. I had to change display refresh rate outside the application to match the playback content's frame rate (or half frame rate). It is hard to decide which is the best of all offered playback settings. I came across crashes and other inabilities to play many times, so version 0.29 is more stable in my experience. It is sad when the playback does not start and you loose the bookmark. And when crashes happen, apport takes ages and still can not report the bug. I just kill the apport process and try to quit the frontend.