難怪啊



剛才菇到的資料，是CENT發的應該不假

4K Blu-ray discs arriving in 2015 to fight streaming media

內文有提到
Although 4K Blu-ray doesn't require larger disc capacity, they would benefit from it
-- and that's something else the association is working on.

The new 4K Blu-ray drive players will be able to extract data from discs at 82 megabits per second
for 50GB discs, 108Mbps for 66GB discs, and 128Mbps for 100GB discs.

The technology quadruples the number of pixels from 1,920x1,080 pixels with today's HD to 3,820x2,160
pixels with UHD.

這段我猜應該是在講BDXL

First is better dynamic range. The 4K format will increase the bit depth for each pixel from 8 to 10,
meaning that a greater range between bright and dark can be recorded for video that's been produced
to take advantage of that.

Currently, "with fireworks or flashbulbs or looking at the sun, you get the level of brightness as
with anything else white in the scene," Martin said. "Now we have 100 percent more signal range to
capture those highlights to make a visible difference."

Second is a broader range of colors. A new color-recording technology called BT.2020 allows a wider
gamut, Martin said.


另外還有一篇
CES 2015: BDA confirms preliminary spec for 4K Blu-ray discs

結合兩篇新聞稿的說法，感覺10 bit應該是箭在弦上，再對比流量128Mbps

這樣的話我猜 4K UHD BD 用的 Profile 就會至少是 L5.1 以上
不然就塞不進3820x2160 @60fps的格式了