WDTV Live - playing MTS files 1920x1080 50p (specification AVCHD 2.0)

WD Legacy Products WD TV Live & Live Plus
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50p?  No.

The “correct” answer is, “it might work, but it might not.”     WD doesn’t support it.

They don’t support it on ANY player.

Check the specifications in the manual(s) for the limitations.