[Bug 745287] basesink: drain query doesn't fully work to release v4l2 buffers

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=745287

--- Comment #5 from Thiago Sousa Santos <thiagossantos at gmail.com> ---
Created attachment 298120
  --> https://bugzilla.gnome.org/attachment.cgi?id=298120&action=edit
basesink: when draining, deep copy the last buffer to unref old memory

Use gst_buffer_copy_deep() to force the copy of the underlying
memory instead of possibly doing a shallow copy of the buffer
and just referencing the memory

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