The Le Potato AML-S905X-CC has h.264 and h.265 decoders up to 4k, emmc connector So you don’t have to run off an SD card. I’ve used it as a media player and its pretty damn solid. I can’t speak to streaming games because I don’t do that, so I don’t know if it’s a different format. It does not have a powerful processor, so if the stream is encoded differently I wouldn’t expect it to be very good.

Its pretty old, around rpi3 performance, but having the decoders in there make it better than the RPI 4 for playing those types of videos.