Noting, this PSA is absolutely useful for older components - especially Intel, but anyone using something newer than Skylake (circa 2015) is probably already set up with intel-media-driver or the nv/amd video driver.
nvtop is a useful tool to monitor GPU activity and the decoder in use when a video plays, if you’re unsure
Hardware video acceleration
So I recently made a discovery that I honesty feel daft for not realizing before....