Thanks all for all inputs .
actually I noticed that the Sony UBP-X700 has 4k SR while my apple TV was 4k HR , when I changed the apple TV to SR then I got much better results from sppeciilay VLC and both Plex player and Infuse ...perhaps as SR is not brighter it suits my environment ( white walls) ...( but HR and even Dolby vision much better on my OLED TV) ...
last night I noticed another issue :
I watched a black and white movie via my projector and it was in 1080p... again in my humble Sony UBP-X700 , I had a very smooth picture which I believe its been properly upscale to 4k , then I watched it with plex in apple TV, then VLC , then Infuse ...and with all I could seen the pixels so as if they failed to upscale to 4k, not sure if its Apple TV issues or those player's... please see pictures, which I hope I could capture this... I would chose the UBP-X700 and forget the rest if it could have 3 things : - could get audio for all formats , practical search ( from my thousands files) and also subtitle...
so which I would say device ( or software) can have proper 4k up scaling like UBP-X700 ? can N Shield TV , Zappiti or Odroid do that?
if I could add the capabilities of all other players and media management with the quality of UBP-X700 and then I could have the ultimate solution and then just focus on the main things which is watching movies
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