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Old 10th December 2013, 10:39   #2  |  Link
sneaker_ger
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Join Date: Dec 2002
Posts: 5,565
The differences in your results are unintended coincidences/normal deviation (not least because of your extremely short sample size), CBR is not made to "promote" bitrate or PSNR - usually it's quite the opposite since vbv restricts x264 in its possibilities to distribute bits freely. CBR is used if you want to maximize the bitrate in e.g. a streaming scenario or if the streaming application requires it.
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