[Bug 792034] dmabuf import with icamerasrc plugin does not working with gst-vaapi-1.12.2

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=792034

--- Comment #5 from sreerenj <bsreerenj at gmail.com> ---
(In reply to Nicolas Dufresne (stormer) from comment #4)
> Ok, indeed automatic importation from vaapi dmabuf to the camera is not
> automatically supported. It is also broken in v4l2src, so if there is a hack
> to enable it, please remove right away, I'll remove it if it is still there
> when I'm back in Jan (unless I have a patch that adds the missing
> validation).

Does it mean to remove the "dmabuf-import" option completely from v4l2src (+
the corresponding code from gstreamer-vaapi)?

> 
> What is complicated is that you need to tell the driver the strides and
> offsets of the allocated images. And as there is currently no kernel API to
> help with negotiating the allocation between two drivers, these need to
> match on first try. Drivers like UVC, that could support arbitrary
> alignement simply don't implement it, and enforce a certain alignment. V4L2
> API is not very friendly as it merge the format and alignment ll together.

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