I've seen on other Forum posts here that a Chroma Sub Sampling of 4:4:4 is recommended, however when I see my rip bluray info the Sub Sampling used is 4:2:0, so if remaining bit for bit perfect (taking an audio term often used) would it be better to use this chroma setting?
The answer is far from easy. Read quite a lot on it from experts in the field.
1) In general the advise is not to do up sampling multiple times. So going from the common BD source 4:2:0 to 4:4:4 how it is actually displayed is recommended in 1-step. Now the question is where to do it? Does a Himedia media player really do a better job than your (expensive) TV or AMP?
2) There is also the relation with HDR and Deep Color. Some options are coupled here. I learned that also this is not recommended. Giving out video in the wrong format (that is pretending to be more advanced than the content actually is) often works negative. Tested in detail with Deep Color 12-bit for 1080P24. I do have several media players and also some real Blu Ray players that all have a Deep Color option for 1080P. Some players give out 12-bit (called there sometimes 36-bit) permanently when Deep Color support is enabled. Others do this only when in fact the source is 12-bit and change between 8-bit and 12-bit when applicable.
My TV apparently does up sampling for 8-bit signals to 12-bit for all signals. When a device is connected which gives out 12-bit always then the picture quality is clearly degraded as this results in color up sampling being implicitly being disabled (the TV is fooled receiving a HQ 12-bit signal).
So it all depends on the combination of player and TV/projector, there is no universal best setting. The smarter and better quality the TV the more likely it does a (far) better job than the media player hence 4:2:0 by preference following the source. Also features like HDR/Dolby-Vision and UHD 10-bit should be dynamic following the source material and should not be fixed settings putting a smart TV/Projector on the wrong leg. They neither should be coupled. Having individual options (ON/OFF/AUTO) is essential to avoid switching to advanced signals not understood/supported by the TV with the default being OFF obviously. AUTO to be interpreted as AUTO=Dynamic following SOURCE and not AUTO=Always ON If supported by the TV!!! I am inclined to call the right implementation choice SOURCE instead of AUTO to avoid these 2 different interpretations for AUTO.
An other example: HDR can be set to SDR, HDR or Other (=supposedly being Dolby Vision). Strange as when DV is really coming some videos will be HDR10 and others with DV. Are we expected to change HDR settings each time accordingly? Also all HDR enabled TV's do up scaling of SDR material to their HDR implementation already today, these will be put on the wrong leg too.
For my 8000 series Philips TV the best setting is 4:2:0 with SDR and 8-bit which can't be configured for Q10 Pro. Some other boxes produce a gorgeous image with it. I have my clear doubts if Himedia is following the right track here looking at the various options and settings implemented now. I truly hope it is not a HiSillicon mistake (build into the SOC).
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Topic: What Croma Sub Sampling should I use? (Read 6675 times)
