I'm using latest kodi-rpi 19.0-9 on RPi4 4GB with armv7l and have some questions.
My hardware setup includes an HDMI audio extractor on which I can't get audio with kms driver. Problem is explained here by HiassofT: https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=288234&hilit=kms+hdmi+sound&sid=de66b935c9cd67d5bcfc7b408b1b94a4&start=350#p1786593 I just couldn't get the edid stuff to work so I'm stuck with fkms for the moment.
However I've been testing some clips, movies and live TV with both kms and fkms, see attached.
I noticed that the jellyfish h264 does not start without any gpu_mem, both kms and fkms. As soon as I add gpu_mem it works. I use 320 while that was recommended with fkms for kodi 18 but I wonder if there is a recommended setting for use with kms driver.