Yes I get that but that does not explain why the “same” movie hosted on the “same” provider (Netflix) Being watched on the “same” TV with the “same” picture” settings is displaying darker when watched via Netflix on Comcast vs when I stream it from my TV using the Netflix app. Something is getting lost in translation in the streaming thru Netflix when it goes through Comcast.
The video output your X1 box provides may be the bottleneck. Do you own a 4K dolby vision/HDR10 tv? If so, does the X1 box support 4K output and is it properly configured to do so? Both examples you provided Ozark and Birdbox are provided by Netflix in 4K.
Edit: This can also be an issue in reverse. Older 4k TVs are advertised as featuring HDR10 support...but in actuality HDR playback results in a darker picture *for some tv sets. I'm theorizing that the Netflix app installed on your tv is selectively streaming 4K content in HDR8 not HDR10 (it's an issue Netflix has been tackiling)....while the X1 box doesn't know any better. The TV is telling the box it fully supports HDR10....so it's outputting in HDR10 without considering the video panel itself will result in a darker picture.
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