[Bug 758085] v4l2: Track /dev/video* to triggered required probe

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=758085

--- Comment #9 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
(In reply to Tim-Philipp Müller from comment #8)
> So is this a "developer feature" then basically, for people hacking/trying
> drivers? If yes, I'd hide it behind an environment variable instead.

Not sure what makes you think that. There is no other way to use a M2M VL42
decoder (and there will never be) within playbin without that feature being
enabled. You seems to expose a concern of having this probing code to run from
time to time on platforms where there is no such decoder or converter.

> 
> I would like to avoid unnecessary rescans of the plugin on non-embedded
> systems.

At boot, it is necessary. We cannot know between two boots if the topology of
the system will be the same or not. For that same reason, pulseaudio will probe
the alsa devices every boot.

I think I have confused you with stating that this could be disable on certain
embedded platform. In fact, I should have said on certain embedded use case,
where static pipelines are to be used.

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