[Bug 796106] video: Support alternate interlaced video

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796106

--- Comment #15 from Guillaume Desmottes <gdesmott at gnome.org> ---
We'll also have to change existing code as we are breaking the assumption
'info.size == buffer-size'.

Like in gst_video_frame_map() :
https://cgit.freedesktop.org/gstreamer/gst-plugins-base/tree/gst-libs/gst/video/video-frame.c#n120
or video_buffer_pool_set_config :
https://cgit.freedesktop.org/gstreamer/gst-plugins-base/tree/gst-libs/gst/video/gstvideopool.c#n143

I'm sure there are more of those.

The one frame / one buffer model will go away with bug #660770 as well so it
may be interesting to think about the proper general solution we'd want.

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