~3-10% improved compression with CAVLC. --trellis is now a valid option with CAVLC. Perhaps more importantly, this means psy-trellis now works with CAVLC. This isn't a real trellis; it's actually just a simplified QNS. But it takes enough shortcuts that it's still roughly as fast as a trellis; just not quite optimal. Thus the name is a bit of a misnomer, but we're reusing the option name because it does the same thing. A real trellis would be better, but CAVLC is much harder to trellis than CABAC. I'm not aware of any published polynomial-time solutions that are significantly close to optimal.
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