Extracting outer MAC Address

[Rayne <hjazz6 () ymail com>]

Hi all,
I have vlan packets that contain 2 Ethernet headers, and I would like to extract all source MAC addresses from the 
first (outer) Ethernet header. However, tshark automatically extracts the second (inner) MAC address.
What I have is
tshark -r file.pcap -T fields -e eth.src -w output.pcap
How do I extract only the outer MAC address using tshark?
Thank you.
Regards,Rayne

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