IIRC, M4G uses some tools to build the correct convolution. I'd have to go digging through search a bit for it, but he actually detailed the process he used once.
Note: 6 seconds per frame still seems a bit excessive (but still plausible). I was able to get much faster processing on -HD- material. What CPU do you have and are you using the defaults?
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You can't call your encoding speed slow until you start measuring in seconds per frame.
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