[Bug 771750] v4l2videobufferpool: Need set right video meta

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=771750

--- Comment #2 from kevin <kevinbing.song at gmail.com> ---
I met the issue with our own V4L2 driver. The V4L2 driver is in development. So
I can't show your reproduce the issue.

The major point of the issue is v4l2videodec output video frame buffer with
wrong meta. The video meta offset is max memory size. But glupload will use the
meta as gstbuffer size.

The right fix should be update the video meta after DEQUEUE one buffer from
V4L2 driver. Set the video meta offset with V4L2 output buffer payload size.

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