Yeah, I assume they're doing it to save bandwidth, but how much this constant 1080i-p swap per GOP actually saves I dunno.
The spec. thing can be a tricky issue, I've never read big chunks of the DVB-T specs, but the bits I have read seem much the same as the equivalent cellular ones; there are all sorts of ambiguities which lead to different designers doing different things and incompatibilities arising. Testing every possible aspect of functionality before release is unlikely I would think.
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