GstBuffer data structure.

[Farrel]

Hi All.
I've retrieved buffer from playbin2 via appsink. And I faced the following:
I know that picture resolution is 704*306. So it means that there is 215,424
pixels. Size property of GstBuffer is equal to 323,136. So as I understand
each pixel should be described by 323,136 / 215,424 = 1.5 bytes. 
Can anybody explain it? Or maybe I'm wrong, or it's all about buffer's
structure?
Thanks in advance.

PS. Sorry for my English.

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