Raspberry pi never fires a EPOLLPRI event

[FallingSnow]

It seems that while using V4L2 on the RPI4 no EPOLLPRI event is ever fired. The stateful decoder in v4l2r requires a EPOLLPRI to read a v4l2_event which will trigger a resolution change, in turn enabling the capture queue.

Is there a way to use the stateful decoder even if no v4l2_event is triggered? Of course you would need to manually set the output format then.