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That processor is fast enough, we did some internal tests with a gigabyte brix 2955U, which managend 1080i50 LiveTV without any issue. Please make sure, that you don't force Lanczos3 Optimized for that 1080i resolution (see settings from the first post), your logfile will show that anyways.

Edit: I tested most of this code with a Celeron 1007U, which has dual 1.5 ghz but old IVB architecture, so your 2955U is certainly enough.