I upgraded to kodi-rpi 19.1-1 and hardware acceleration of h264 stopped working on RPi 3.
kodi-rpi 19.0-10 log
kodi-rpi 19.1-1 log
The important difference seems to be this:
$this->bbcode_second_pass_code('', 'CDVDVideoCodecDRMPRIME::Open - using decoder V4L2 mem2mem H.264 decoder wrapper')
vs.
$this->bbcode_second_pass_code('', 'CDVDVideoCodecDRMPRIME::Open - using decoder H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10')
I've also seen that linux-raspberrypi4 is now an optional dependency for HW accelerated decoding, does that mean HW accelerated decoding isn't supported on RPi 3 anymore?