Register the multiple devices available on the system in separate features in the registry for the vulkan decoders. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7011>
The code to include H264 decoder base class header wrongly disabled the unstable API message. This patch fixes it by setting it as a compilation define of the plugin.¡ Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6055>
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4850>