Stuck setting pipeline state to ready - pipeline.set_state(Gst.State.READY) due to TriggerMode about tiscamera

[TIS-Stefan]

Hello

The "valve" wont become ready, if there are no images. That is the blocking part.
It even can happen, if the "valve" is "closed", that following modules do not get ready.

[Edit]
I would avoid the "valve" and use a flag inside the appsink callback, which controls, whether frames are handled or not.
You may also set the appsink properties "drop" and number buffers, so you do not get too much buffers. I would at least pull each buffer in the appsink callback and if not handled, drop then.

Stefan

[Niv-R]

I've tried removing the "valve" from the pipeline, but the issue still reproduced.