"pipeline is prerolling" debug strategy?

[Eric Montellese]

Folks, in development I've run into various malformed or buggy pipelines
that give this output:

gst-launch  launch ! a ! pipeline
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...

Generally I have debugged these issues through a mixture of brute force and
intuition (looking for common sorts of problems, etc).

But perhaps there is a better way to determine which element has held up
the pipeline?  Some swanky debug command I'm totally unaware of that shows
the buffers in-flight perhaps?

Any advice?

Thanks,
Eric
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