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Blocking in dark areas is a known issue with x264, but I have no idea why this does not happen to you when using x264 in VFW mode, and it should not be that noticeable. Do you see the same artifacts in x264 encodes done by others? Try going to the Zones tab in the Video configuration tab, selecting your favorite profile and typing in --aq-strength 1.1 in the Custom Commandline Options text box. Press Update to confirm the change and encode another video. Did this fix your problem? Most likely not, but I'm trying to narrow down the problem.
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