pmaports

Gstreamer enables hw de- and encoding by default for the most common APIs,
including V4L2-stateful. Unfortunately the venus driver is still quite
unstable, reliably crashing in very common scenarios, triggering apps
like Snapshot, Showtime or Tuba to show error messages or not working
properly - partly because of non-optimal error-handling.

Until the kernel driver situation improves, set environment variables
that demote the decoders to fallbacks in case nothing else is available,
and disable the hw-encoders completely as they tend to destabalise the
whole system if something goes wrong.

Useful command for env variables:
systemctl --user show-environment