Note: I edited this post on Nov 4th to correct obvious misunderstandings that I had in my original post. If I’m misstating anything, please let me know…I’m really trying to understand this all.
This particular topic has always been a confusing one for me and I’ve owned every version of the Apple TV. The screen shot below is from the 2021 4K ATV attached to my LG C2 4K TV (which is capable of Dolby Vision).
Seems to me there are 3 settings involved in the Video and Audio section as relates to this topic:
- The top row in the pic below (Enable Dolby Vision): This is a confusing row in that it only appears if you have a set capable of Dolby Vision & you’ve chosen not to set the “Format” setting to one of the options that enable/turn on Dolby Vision.
- The “Format” setting
- The “Match Content” setting
My understandings are as follows. This pertains to 4K TV‘s that support Dolby Vision and the 2021 4K ATV:
- If I set the ”format” to 4K SDR, and have “Match Content“ turned on for both dynamic range and frame rate (ie as I do in the picture below):
- The home page (ie app listing) will be in 4K SDR
- When I watch any content that is streamed in 4K Dolby Vision (ie the Crown on Netflix) it will switch to Dolby Vision and the content will be displayed in 4K Dolby Vision.
- When I watch anything that is streamed in 4K SDR (ie various movies on Netflix and Prime Video) the content will be displayed in 4K SDR.
- When I watch anything that is streamed in 4K HDR (ie various movies on Prime Video) it will switch to HDR (on my LG 4K OLED set) and the content will be displayed in 4K HDR.
- When I watch anything that is streamed in 1080P (ie Network news shows and various HBO movies on my YouTube TV app) the content will be upscaled to 4K and will be displayed in 4K SDR.
- When I watch anything streamed in non HD (ie various old sitcoms on my YouTube TV) the content will be upscaled to 4K and will be displayed in 4K SDR.
- If I set the “format” instead to 4K Dolby Vision and have the “Match Content” set the same as above:
- As noted above: I no longer see the top row in the pic below. The one that says “Enable Dolby Vision”. I guess since I’m already “enabling it” by choosing it as the format…that would be redundant to also have this “notice”.
- The home page (ie app listing) will be displayed in “4K Dolby Vision). I think 🤔
- Other than this, the two settings behave exactly the same for the functions I’ve noted above (ie streaming content on Netflix, Prime Video or YouTube TV App will be displayed in the dynamic range and frame rate of the source content being streamed).
So, it seems on the surface at least that regardless of how you set the “format” setting (ie either 4K SDR or 4K Dolby Vision), as long as you turn on the “Match Content” settings for both dynamic range and frame rate, your streaming outcome (on Netflix and YouTube TV at least) will be the same….as described above.
I guess Apple TV gives us the option (under my use case) to set the format to 4K SDR (ie as I’ve done) and to also
not “turn on” the two “Match Content“ settings (ie Dynamic Range and Frame Rate). In this case, when you streamed a 4K “Dolby Vision” show in Netflix, it would display in 4K SDR (instead of in Dolby Vision). Not sure why anyone would want to do that….but seems they’ve given us that option.
I guess also that Apple gives us the option to (under my use case) to set the format to 4K Dolby Vision and
turn off “Match Content” for both dynamic range and frame rate to force everything you stream to be mapped to and displayed in Dolby Vision at the native frame rate of my TV. Not sure why anyone would want to do this either. I can imagine some unnatural colors and other artifacts depending on what the content is (ie from the mapping to Dolby Vision).
For Most of us, I’d imagine that if we have a 4K TV that’s capable of displaying in Dolly Vision that we’d want turn on the “Match Content” settings for both dynamic range and frame rate so that Dolby Vision, HDR or neither would kick in depending on the content being streamed. But then this leaves us with the 1 simple choice. Do we set the “format“ to 4K SDR or 4K Dolby Vision? I chose to set it to “4K SDR” so that any content that is not affected by the “Match Content“ settings (ie the home page for example) will display in 4K SDR and not be forced to display in Dolby Vision (ie the home screen app’s for one).
Can anyone see a reason why you would want to set the “format” to 4K Dolby Vision instead of 4K SDR when you‘re also enabling the “Match Content” settings?
What a confusing topic 😊. You’d think Apple could have explained this better…but I’ve yet to find any documentation from them that goes into the various nuances of these settings in the detail needed to really understand the optimum way to set them.
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