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Sounds like such a block would be highly dependant on a specific recorder + driver combo. In the name of science I’ll do some experimentation tonight.
UPDATE: Worked just fine for me.
Netflix running Bojack Horseman in Firefox under Linux Mint, stock NVIDIA 550 driver, and replay-magic as screen recorder.
Positive contribution to a community is more important than following the rules strictly. If a thread technically is against the rules, but is relevant to the community and has positive interaction, it usually gets a pass from me.