Is HDMI 1.4's 30fps maximum @4K a high enough frame rate? - AVS Forum
View Poll Results: Is HDMI 1.4's 30fps maximum @4K a high enough frame rate?
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post #1 of 4 Old 05-26-2009, 03:41 PM - Thread Starter
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The current HDMI standard will support full 1080p at 60fps, but HDMI 1.4, while supporting a higher resolution (4K), will only do so at half the frame rate.

Is HDMI 1.4's 30fps maximum @4K a high enough maximum frame rate?
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post #2 of 4 Old 05-28-2009, 06:55 AM
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it must be some sort of a mistake because HDMI 1.4 has bandwidth of around 20Gbps and
4096x2160x30bx60fps= 16Gbps

30fps is only 8Gbps obviously
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post #3 of 4 Old 05-28-2009, 05:17 PM - Thread Starter
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According to this website:
http://www.twice.com/article/CA66611...?desc=topstory

and this one at hdmi.org http://www.hdmi.org/press/press_release.aspx?prid=101

Full 4K on HDMI 1.4 won't even support 30fps.

It says 3840x2160 can be 24/25/30hz
and 4096x2160 can only be 24hz

I worked it out that 60fps at 4K, excluding audio should only need about 11.86 Gbps
((4096*2160)*3*60fps)/134,217,728 = 11.86 Gbps

If using 3 bytes per pixel for RGB 16 million colours
1 gigabit = 134,217,728 bytes
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post #4 of 4 Old 05-28-2009, 07:20 PM
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it seems like 24 and 30 refers to bits per color and journalist confuse that with fps. New Displayport standard is capable of 3840x2160x30bppx60fps
and it would be suicidal for hdmi not to match that much
http://www.mtbs3d.com/phpbb/viewtopic.php?f=2&t=2221
Few key points:

•multiple independent video streams
•doubling of the effective bandwidth to 17.3 Gbit/s
•AUX channel bandwidth increases to host bi-drectional USB

In summary, DP 1.2 is able to host

a.two (L-R) 2560x1600 60 Hz video streams (or a single 1600p120 stream) at 30 bpp color;
b.one 3840x2160 60 Hz 30 bpp stream, or
c.four 1920x1600 60 Hz or 1080p60 streams at 24 bpp , etc.
over a single cable.
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