[Bug 746834] v4l2sink: driver is not queried for minimum number of buffers when propose_allocation is not called

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=746834

--- Comment #9 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
You can keep this bug, we'll update the title as needed (or close if we
eventually agree on that). One ambiguity is the V4L2 spec is if the MIN_FOR
includes or not a buffer for userspace. Though, I think it's quite clear driver
should provide at least one buffer that the userspace can use while the driver
is operating. When this isn't the case, the pipeline stalls, because the pool
as no more buffers to offer. It's also why for decoder, if MIN_FOR isn't
supported, we always run out of buffers.

That's why I'm not surprise you are having issues, and that's why I'd like to
go through this with you, and figure-out what we need to clarify.

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