Netflix has a debug screen that will show you the codec info. It varies depending on platform but you can Google it to find the one for your platform. For the W

Netflix has a debug screen that will show you the codec info. It varies depending on platform but you can Google it to find the one for your platform. For the Windows app, it's Ctrl-Alt-Shift-D. That shows H264 on my device since I don't have hardware that can decode H265. On Android, I've seen VP9 streams.