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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #5 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
(In reply to Tim-Philipp Müller from comment #3)
> I would like to understand the impact of this patch on 'normal operations'
> better first.
> 
> Does it mean the v4l plugin is typically reloaded after every reboot, even
> if nothing changed?

With non-static /dev it will. It's a minor hassle compare to the underlying
bugs. I can make this opt-in instead, if you don't agree. This feature need to
go in, with compile option or not.

> 
> Does it mean the v4l plugin is reloaded every time a usb camera gets plugged
> or unplugged and a gst app is started?

It's not a daemon, so it will be updated after you have plugged/unplugged.
There is no other mean with GStreamer to be smarter, and it's not worth writing
infrastructure for this in my opinion. The probes are a very limited sub-set of
the actual probes that get run when you switch to READY.

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