Planet Earth isn't telecined (at least none of the versions i ever saw), its plain 60i.
What probably happens is that "Video" mode Deinterlacing will deinterlace to 60p, while "Film" mode deinterlacing only deinterlaces to 30p, avoiding the issue for some reason.
I have seen numerous problems with partial VC-1 acceleration in combination with HW deinterlacing, its just a rather unstable combination.
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LAV Filters - open source ffmpeg based media splitter and decoders
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