HDMI 2.0後遺症
上星期SMPTE (the Society of Motion Picture and Television Engineers)舉行了2013 Annual Technical Conference and Exhibition, 其中一個座談會是"Next Generation Imaging Formats: More, Faster, and Better Pixels"內容集中在high video frame rates, ATSC 3.0, 反而HEVC和HDMI 2.0被忽略了.
BTW我反而關心作者提及的以下內容 :
Although it wasn't discussed at the symposium, I want to clarify what manufacturers mean when they claim their current displays have "HDMI 2.0" capabilities. Some of these capabilities can be implemented by updating the firmware of existing chipsets, but other capabilities can't be implemented without new hardware, which we won't see in consumer products until next year. For example, current HDMI hardware, which has a bandwidth of 10.2 Gbps, can support UHD (2160p) at 60 fps, but only with 8-bit color and 4:2:0 subsampling.
http://cdn.avsforum.com/b/bb/900x900px-LL-bb3fada4_HDMI-vs-UHDTV.jpeg
Anything above the double line in this table can be conveyed with current HDMI hardware; anything below the double line requires new hardware that isn't available yet.
Most of the presenters advocated for UHD to adopt the entire Rec.2020 suite of parameters, including a resolution of 3840x2160, the specified color gamut (if not XYZ), frame rates up to 120 fps, at least 10-bit color (preferably 12-bit), and 4:2:2 subsampling (if not 4:4:4).
However, HDMI 2.0 at 18 Gbps can't accommodate all these upgrades, so we face a dilemma—increase HDMI 2.0's data rate, abandon HDMI for DisplayPort, or accept lower standards for UHD.
In my view, HDMI is too entrenched in the consumer-electronics market to be supplanted by anything else, so I'm afraid we may have to settle for less than the best possible UHD experience, at least until HDMI is upgraded yet again, which I can't imagine happening any time soon.
Text by Scott Wilkinson, avs
http://www.avsforum.com/t/1496765/smpte-2013-uhd-symposium
HDMI的極限嗎? 乾脆全都轉成DP吧,電腦也能用.
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