I wanted to see how much it would increase efficiency for x265 vs x264 and I assumed that it would help considerably for x264 but less with x265 because it's more modern and would compensate the motion better but I was wrong.
For the original shaky footage:
x264 CRF16 with maximum settings produced 2304 kb/s.
x265 CRF16.6 produced 1803 kb/s for the same SSIM. 28% reduction.
Video was always stabilized with Vdub deshaker.
x264 CRF16 produced 1612 kb/s. 43% reduction from shaky original.
x265 CRF16.6 produced 1266 kb/s. 42% reduction.
Video was then professionally stabilized to be 100% stationary.
x264 CRF16 produced 1662 kb/s. 39% reduction.
x265 CRF16.6 produced 971 kb/s. 86% reduction.
It seems x265 benefits more greatly from stabilization than x264. Why the substandard Vdub deshaker increased compression for x264 over professional methods is unclear.
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Because Deshaker by Gunnar Thalin for VirtualDub is pretty darn good at motion tracking and has plenty of sophisticated options for border treatment.
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It's not better than professional stabilizers like mocha pro. The video I uploaded was the mocha-stabilized result. The output of the virtualdub deshaker had more movement yet was compressed more by x264.
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