Hi,
There is crashes in playback (Segfault of mmal library) with last firmwares including the raspberrypi-firmware-20200106-1.
I actually use raspberrypi-firmware 20190921-1 without problems or segfaults.
Can you solve this problem with last firmwares, this is simple to reproduce this bug, notice I don't have crash with my Rpi4 (of course it's not the same firmware package )
ahh, I had a problem with DHCPCD and IPV6 (tentative state with address already in use) the problem is solved with the latest update (I loke to finish with a positive note )