There's not much point in doing a 2pass quantizer encode since there's no bitrate target that needs to be met with a quantizer encode, so x264 will get it right the first time. Anyway, if you are very picky about it, then you can do a first pass with a constant quantizer, get the bitrate of the file from the log, and then do a 2pass encode with that new bitrate, but seriously, why?
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