(2019-11-04, 20:22)mattmarsden Wrote: Will the new Shield do player led DV?
(2019-11-05, 13:08)noggin Wrote: (2019-11-05, 03:26)wrxtasy Wrote: The exceptions are LG and the 2019 Panasonic’s OLED’s that get the full Monty - TV led - DolbyVision treatment, and they also produce superior DV picture output as a result.
What's the basis for that ? Isn't the difference between player-led and TV-led DV just the different routes that metadata takes? In TV-led (which is backwards compatible with HDMI implementations that otherwise only support static HDR metadata) the DV metadata is 'hidden' in the active video signal through tunnelling (which means the TV has to process the incoming video via DV-aware hardware to detect and extract the metadata), and some players may also have to be able to embed the metadata within the active video (presumably whilst it merges the dual HDR10 and DV enhancement video streams?).
With player-led DV the metadata is extracted from the DV video stream (or enhancement layer in dual stream UHD Blu-Ray ?), in the player, and sent separately over HDMI using HDMI's dynamic metadata pathways that were added in later. As a result the TV has no requirement to process the HDMI video signal to extract the metadata, as it is supplied using HDMI standardised signalling pathways (rather than using a tunnelling hack?)
What aspects of player-led vs TV-led metadata introduces a quality difference for the two routes? Or am I missing something obvious?
AIUI TV-led DV was always an interim system Dolby introduced to bypass the lack of progress in HDMI supporting dynamic HDR metadata?
(2019-11-05, 03:26)wrxtasy Wrote: (2019-11-04, 20:22)mattmarsden Wrote: Will the new Shield do player led DV?
Yes all these App streaming DolbyVision capable media players like Apple TV 4K, FireTV 4K / Cube & 2019 Shield all use single layer - player led DV profile 5 for streaming.
A lot of the cheap (and not so cheap in the case of Sony) 4K HDR DV TV’s also implement - player led DV - only as well.
The exceptions are LG and the 2019 Panasonic’s OLED’s that get the full Monty - TV led - DolbyVision treatment, and they also produce superior DV picture output as a result.
So, is the shield sending a "player-led" dolby vision signal to whatever TV or is it counting on the TV having "TV-led"?
If the shield sends "player-led", does it also process profile 4 dolby vision, with an enhancement layer? Im reading ppl making UHD backups and playing on plex etc (hopefully soon kodi) with enhancement layer intact, single layer not dual layer, so the enhancement layer is within the same stream, there are tools that do this.
im wondering because i recently discovered my Sony OLED only has player-led dolby vision, so i must know if the Shield processes baselayer+enhancement layer before sending to TV?
Thank you
(2019-11-05, 18:41)noggin Wrote: (2019-11-05, 18:16)wesk05 Wrote: (2019-11-05, 13:58)noggin Wrote: If the difference is just reported subjective differences between different TVs displaying DV content and those two TVs are using different DV metadata routes - then I'd avoid any assumption of correlation meaning causation - the differences could be in DV performance and nothing to do with the metadata delivery system. It could just be that the Dolby result on some models is different to others. Unless someone is actually doing objective tests demonstrating a difference with DV test signals on a display that supports both metadata routes.
The difference being reported between "player -led" and "TV-led" Dolby Vision is likely due to profile limitations and encoding differences. Profile 5 if encoded with 12-bit PQ remapping is likely to look very similar to profile 7 "TV-led" rendering. If there is no remapping done, then profile 5 content is limited to 1000 nits.
@wesk05 What does this mean for a UHD Blu-ray with Dolby Vision being played on a TV-led UHD Blu-ray player vs a Player-led UHD Blu-ray player? (Same dual stream source - but one using tunnelled metadata, the other using HDMI dynamic metadata?)
I never saw if this was answered?
Would a UHD player who is new enough, like the Sony x700 combine the baselayer and enhancement layer and then send it to the TV?
Thanks