LLDV (Low Latency Dolby Vision)
LLDV is player-led Dolby Vision: the player does the Dolby Vision work and sends a finished HDR picture.
LLDV means Low Latency Dolby Vision. The player does the hard Dolby Vision work itself and sends a ready-made HDR picture to the screen.
It is like a restaurant that cuts your food for you: the plate arrives ready to eat, so you do not need your own knife.
That is why people use it to get Dolby Vision-style pictures on projectors and TVs that do not have Dolby Vision.
Does the HDfury Vertex support LLDV (low-latency Dolby Vision)?
PARTLYPartly. It has no built-in LLDV EDID: you upload one into CUSTOM 4–10. HDfury says it works with a JVC projector using a custom gamma curve or a display you can force into HDR, for example with Enable Custom HDR (p.15, p.29, p.32).
How to use it with the Vertex:
- EDID MANAGER: Load from File, then Upload EDID into a free CUSTOM 4–10 slot and select it for the player's input (p.15, p.29).
- Check it with Read RX EDID (p.29).
- Set SCALE to No Scaling so the signal passes untouched (p.30).
- For an HDR flag: HDR INFOFRAME tab, EOTF SMPTE ST 2084, Create IF, Send HDR (p.32–33).
- Custom HDR stays on: switch it off for SDR/HDR10 with #set hdrcustom off (p.32, p.51).
What it is
In normal (TV-led) Dolby Vision the TV receives the picture plus Dolby's scene data and does the tone mapping itself. In LLDV (player-led) the player does that tone mapping, using the brightness the display says it has in its EDID, and sends a normal-looking HDR signal, usually YCbCr 4:2:2 12-bit. No Dolby Vision data goes to the display.
A player only sends LLDV when the EDID it reads says the display supports low-latency Dolby Vision and not standard Dolby Vision. A TV without Dolby Vision never says that, so owners put a device in between that shows the player a different EDID.
The LLDV signal often carries no HDR10 InfoFrame. Many projectors then stay in SDR mode, because they only switch to HDR when they see that flag. LLDV quality depends on the player and on how well the EDID's brightness matches the display.
On the Vertex
The Vertex has no built-in LLDV EDID. You load an LLDV EDID file in the EDID MANAGER ('Load from File', then 'Upload EDID') into a free slot CUSTOM 4–10 and select it for the input of the LLDV player (p.15, p.29). Use SCALE 'No Scaling' so the signal passes untouched (p.30).
HDfury says the Vertex (1) can be used for LLDV if you have a JVC projector with a custom gamma curve or a projector you can force into HDR mode by hand. For other HDR displays, Enable Custom HDR in the HDR INFOFRAME tab adds an HDR flag with values you choose, which turns on the HDR mode of an HDR display (p.32–33).
Custom HDR stays on after hotplugs and power cycles (p.32), so switch it off before watching SDR or HDR10 ('#set hdrcustom off', p.51). The manual has no LLDV flag in Automix, and the preloaded CUSTOM 2 [FULL + LG DV] and CUSTOM 3 [FULL + Vizio DV] tables are meant for real Dolby Vision TVs (p.15).
Common questions
Does the Vertex have an LLDV EDID built in?
No. You upload an LLDV EDID file yourself into CUSTOM 4–10 (p.15, p.29). HDfury offers EDID files on its website.
Why does my projector stay in SDR with LLDV?
The LLDV signal often has no HDR flag. Force HDR on the projector, or send one with Enable Custom HDR on the Vertex (p.32).
Is LLDV the same as real Dolby Vision on a Dolby Vision TV?
No. The player does the tone mapping instead of the TV. It can look very good, but results depend on the player and on the EDID brightness values.
Which players can send LLDV?
HDfury names, among others, Apple TV 4K, Nvidia Shield Pro, Xbox One X/S, Panasonic UB820/UB9000, Sony UBP-X700/X800 and Oppo 203/205.