While I can't tell you the intricacies of streaming profiles and how they adapt, I can tell you that a Dolby Vision Profile 5 source (aka LLDV) is a single layer video in a Dolby specific colour space they call IPT which is very similar to BT.2100 which in turn has the same colour primaries as BT.2020. The EOTF is an ST.2084 PQ curve (Starts to sound familiar doesn't it?) and scenes are analysed in post for CLL to provide dynamic but predetermined tone mapping criteria.Yes, when switching the Vetex DV LLDV EDID in and out, the source device alters the signal thru the chain between DV and HDR10.
However, a question I still have, is there a difference in the actual streamed source content, depending on how its initially launched? ie... is there a DV and HDR10 version depending on how the initial handshake takes place? For instance with Disney+, you will see either format displayed depending on how one is connected to the site.
Or, does D+ only have a single 4k UHD DV/HDR source that is sent and is decoded DV or HDR10 depending on the streaming box capability?
If the latter, yes it might be as simple as turning DV LLDV on/off like with content on disc. I'd love to confirm what specifically happens when streaming with a host. I have given deference to the possibilty of streaming being different from playback from disc, but welcome clarification.
So although DV Profile 5 isn't HDR10 compatible in the way that Profile 7 is (HDR10 base layer + enhancement layer combined to reproduce the mezzanine layer) it's not a million miles away.
And this is what you're seeing when you squirt a Profile 5 source at an HDR10 monitor.
Goodness knows if it's all clever enough to adapt profiles if you switch EDID mid stream though...
Have to admit that although it's a bit bonkers and the guy who came up with this has previous, it is intriguing.. Definitely not what the DOP intended, but intriguing nonetheless.
Cue 70's guitar riff with a heavy Gretsch back beat....