this post was submitted on 28 Sep 2023
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Are you sure they said it'll decode 4k h264 smoothly? I'm seeing them saying 1080p is good, but not 4k.
Here's a quote from the article you linked, emphasis mine:
Note that it's unclear from this quote what Codec the Youtube stream was using, but remember that Youtube is quite low bitrate even at 4k. The implication here is that 1080p h264 is good and low bitrate 4k stuff might be okay, but it will struggle beyond that. Keep in mind that it's not any worse than RPi 4 in that area, but I don't think it's going to be much better either.
You quoted those two sentences, but skipped the three sentences right before them:
To my eyes this implies it works fine for 4K h264. The sentences you quote from are sort of a "furthermore, at 1080p it can handle these more complex codecs as well" to my initial reading.
I'm not saying you're wrong, just explaining why I parsed this paragraph a bit differently.