One of my first recorded flight from EGLL to LPMA, I used OBS-Studio on LUbuntu 19.04
It was recorded with software only h_264 encoder, because of limitation of LUbuntu 19.04. It is strange, that LUbuntu 18.04 can use hardware encoder on my nVidia card, but this support dissapeared on newer versions. I don't know why.
And this is trip from EGLL to LZIB, recorded with OBS-Studio on LUbubtu 18.04 hardware h_264 encoder :