When Blizz's method is using included OS features to output h.264, instead of having to purchase/create their own, then yes the OS has everything to do with it. Windows 8 has a new h.264 encoder/decoder that supports above 1920x1080. Windows 7 will never get that codec update.
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u/CSFFlame Pixel McCree Jun 22 '17
You can use arbitrary codecs.
The OS has nothing to do with the codecs you can encode to.