darkarbiter wrote:
看來我目前的電視不...(恕刪)
我剛剛Google了下，似乎國外有高手寫了些東西讓所有螢幕都可以顯示HDR內容
Well, madVR implented playback of HDR videos now and its wonderfull..
And Best of all:
While the big companys are making thyer own soup on wich algo is better and telling you that you have to buy a new TV to playback HDR contend, madVR goes the other way and makes HDR contend avaible to all monitors
I´ll quote from the new version of madVR:
Quote:
* added tone mapping support for HDR content
* added gamut mapping support for HDR BT.2020/DCI-P3 content
* added support for SMPTE 2084 transfer function decoding
* added support for receiving HDR metadata from LAV Video Decoder
* added "maximum display luminance" option to display properties page
* added "HDR" profile variable
* SuperRes now supports being run after every ~2x upscaling step (again)
* improved JVC projector ip control connection reliability
INFO:
Quote:
The big keyword for this build is HDR. I suppose many users might not know how it works exactly, so some explanations:
1) First of all, this madVR build does *not* aim to send HDR content untouched to the display, to let a "HDR compatible" display do all the processing. Doing that might be supported by some future version (as an option). But for now what madVR does is convert the HDR content in such a way that it looks well on *any* display (new and old), regardless of whether the display officially supports HDR or not.
2) The key idea of HDR is to increase the peak white luminance, so that we can get brighter highlights, and more texture detail in bright image areas. HDR content uses 10bit (or more) instead of the usual 8bit, and it also uses an improved transfer (gamma) function, which means we also get better shadow detail at the same time.
3) HDR content is encoded using a totally different transfer ("gamma") curve. So playing HDR content with a media player and display which don't understand the new transfer function won't look good/correct. It will look totally washed out.
4) The new transfer function directly maps each pixel to a specific desired luminance value (in "nits" or cd/m²). Possible values are 0 nits up to 10,000 nits. However, videos don't have to use the full 0 - 10,000 range, they often top out at either 4,000 nits or 1,200 nits (from what I've seen).
5) UHD Blu-Ray will usually be encoded in BT.2020 color space, which is extremely wide. However, videos don't have to use the full BT.2020 space, they usually only use DCI-P3, inside of the encoded BT.2020 container.
6) Today's displays (even the best of the best) cannot really properly reproduce HDR content. E.g. many display's don't reach full DCI-P3 colors yet (let alone BT.2020), and no available display today comes even close to be able to output 10,000 nits! Which means that someone somewhere has to convert the HDR content down to something the display can handle. The consumer electronics world plans that the display will do this conversion (only new models, obviously) - and every TV manufacturer will write their own conversion algorithms because there's no standard for that! From what I've been told those conversion algorithms (at least for the first few HDR display generations) are probably not going to be very high quality.
7) madVR is able to compress both the luminance and the colors down to what your display can handle. It uses reasonably high quality algorithms for that. I might find even better algorithms in the future, but for now these algorithms should be a good starting point.
8) UHD Blu-Rays will come with an updated copy protection. So madVR will not be able to play them - unless the copy protection gets broken at some point.
If you want to test HDR playback, please update to a new LAV nightly build because only the latest LAV nightlies are able to pass some HDR metadata information to madVR!
(P.S: There's also a new "madTestPatternSource" version available with some HDR test patterns. Link see first post in this thread.)
整個來看，似乎是提供一個轉換對應的程式
並可依照使用者給的最高螢幕亮度來調整相對應的HDR亮度
但~最後還是得依賴電視本身的色彩覆蓋率、最高亮度以及各家電視廠商自己HDR演算法的優劣
如果想試試看的話，可以Google madvr HDR
nike6453 wrote:
這意思是不是代表
以後只要買4k藍光撥放機
他有解hdr的能力
所有電視都能看到hdr的畫面
在來就是看電視本身的控光及對比能力嗎
感覺~~
就好像你拿1080p的藍光機接在1366*768的電視上面，依舊能看
類似可以輸出1000nit亮度的藍光機，接在只有100nit亮度的電視上
或是可以輸出BT2020色域的藍光機，接在只有BT709色域的電視上
依舊都能看這樣
這感覺~好像UHD藍光是個質量非常好的訊源
你買的電視越好~越能從這個訊源中撈出更多東西
darkarbiter wrote:
可以請Joey452...(恕刪)
A.下載 Potplay 64bit，安裝
B.下載 LAV Filter，一路下一步安裝
C.下載 madVR ，解壓縮>右鍵>以系統管理員身分執行install.bat
D.打開Potplayer>右鍵>參數選項>左邊選擇濾鏡>再來選 源濾鏡/分離器>點選右邊的濾鏡/解碼器管理>搜尋後新增
步驟如圖下
其實圖中第四個步驟點下去，圖中的第5部分它會自動幫你選好
E.依照D步驟以此類推，濾鏡清單中，選擇LAV Video Decoder，把視訊解碼器設定為下圖
F.點入LAV Video Decoder後面的...按鈕，並且設定為如下圖，這邊也順邊開啟硬解囉
G.依照D步驟以此類推，濾鏡清單中，選擇LAV Aaudio Decoder，把音訊解碼器設定為下圖
H.左邊索引在切換至 視訊，將視訊渲染方式改為 "Madshi視訊渲染"，並點入後面...按鈕>Edit sitting
I.於左邊Device下方選擇你的螢幕設備，並設定為"digital Monitor/TV"
J.左邊Properties，就是選擇螢幕是幾bit、可以提供的最大亮度
K.展開後，選擇 color & gamma ，把enable gama processing打勾，OK
L.撥放檔案吧
個人建議把電視亮度開到最大，效果會很明顯呦
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