[Bug 790473] gstbuffer: Need check GstParentBufferMeta when get buffer meta.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790473

--- Comment #3 from kevin <kevinbing.song at gmail.com> ---
I met the issue in gst_kms_sink_import_dmabuf().
gst_buffer_add_parent_buffer_meta() be called in the function, but not copy
crop meta. gst_kms_sink_show_frame() will get crop meta from output buffer from
gst_buffer_add_parent_buffer_meta(). So loss the crop meta.

Another way is gst_kms_sink_show_frame() get meta from original buffer or copy
meta from original buffer to output buffer. What is your option?

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