Dolby Vision w/FEL + 3D for PC (AMD/Intel/nVidia)

And just as a side note: only thanks to the newly available custom LibreELEC 13 build have these inexpensive HP EliteDesk machines become such incredible multimedia powerhouses! 😃

With 4K playback, native Blu-ray 3D frame packing via HDMI, and Kodi, they're now fantastic home theater PCs.

And that's not all: with Batocera, they're also surprisingly capable gaming machines, including PlayStation 2 emulation!

For around €100 for the base PC, the versatility is amazing.

This new LibreELEC 13 build really makes all the difference.

Many thanks to everyone involved in its development!

Quote from Samui67

Hi cinemaONE and everyone,

I've found the official HP Maintenance and Service Guide for my HP EliteDesk 705 G4 Small Form Factor Business PC (HP document L23140-001, June 2018).

On page 5, under Illustrated parts catalog → Option boards, HP explicitly lists:

The manual also shows the optional rear port on page 3 and documents the option port board removal procedure on page 46.

So HP officially confirms that an HDMI option board was available for this exact SFF model.

However, the manual doesn't specify the exact HDMI module part number or distinguish between version 1 and version 2.

I've already ordered an additional HDMI module and will check the part numbers and compatibility before testing it in the SFF.

I'll report back once I've tested it.

Thanks again for your help and research!HP_EliteDesk_705_G4_SFF_HDMI_Auszug.pdf

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does this help?

yeah I did my research on those HP machines. the 2400G is better than the 3500U which is base minimum recommendation , probably the best machine for anyone who doesn't care for absolute speed
In saying that you'll still have to order the module. it'll cost around £140, for £206 I can get
Topton R7 7840HS 16G LPDDR5, no Storage (get NVME from ebay or something)

but this isn't available for everyone and sales won't last forever.

Thanks for doing the research! 👍

Just to add some information: I bought my HP EliteDesk machines for less than €100 each, and I've found HDMI Flex IO modules on eBay for around €22.

So these machines can be a very affordable option, especially if you already have one.

I'll share the eBay links below. Of course, we still need to confirm which HDMI module version works with the 705 G4 SFF.

https://ebay.io/m/RW64Ft

https://ebay.io/m/B0gKEs

Quote from Unsigned0207

I tried this on the new RC4 and set the maximum bit depth to 8. That fixed the issue for 4k SDR and 4K HDR movies. But as expected all the 10 bit and now being downsampled to 8 bit. Also still have massive frame drops and stuttering when a movie is playing and you trigger the OSD using the O button on the keyboard.

That's sort of strange... I don't have that. I will double check. As far as 8 bit / 10 bit, personally I'll convert all non-SDR content to Dolby Vision anyway. DV encapsulate its 12 bit content in a 8 bit stream, so no color information should be lost. For SDR 10 bit content (it's basically just anime scene encodes that use it, AFAIK), I'll use 8 bit dithering. I remember testing it with madVR, years ago, and results are basically indistinguishable from the source, to the naked eye.

Unsigned0207 I confirm: I don't have massive frame drops/stuttering when accessing the OSD. Tried with HDR, Dolby Vision and SDR content. Sometimes it dropped a frame when opening the overlay but that was it.

Quote from Unsigned0207

I tried this on the new RC4 and set the maximum bit depth to 8. That fixed the issue for 4k SDR and 4K HDR movies. But as expected all the 10 bit and now being downsampled to 8 bit. Also still have massive frame drops and stuttering when a movie is playing and you trigger the OSD using the O button on the keyboard. Again this only happens with Tigger Lake. I ran another using vm on proxmox with AMD Ryzen 5 5600G and it had no such issues.

Can you share the log please.

Quote from sunlollyking

Hi CroqueMr would you take a PR adding desktop OpenGL support, so Dolby Vision works on a GBM OpenGL build as well as GLES? I’d like to run my AMD box on the OpenGL build without losing DV.

What I have in mind:

• One code path rather than a GL copy. CB1’s GLSL ES 3.x shaders compile unchanged in a desktop GL context on Mesa (ARB_ES3_2_compatibility on radeonsi and iris), and the GL calls are the same apart from a few OES/EXT names.
• Lift the GLES-only checks in CMake and package.mk, build DVBridgeGLES for both, and hook it into LinuxRendererGL, RendererVAAPIGL and WinSystemGbmGLContext the same way as their GLES versions, sharing the output code between the two GBM contexts.
• Test on an AMD 780M across TV-Led, Master Reference, HDR10 conversion and FEL.

Would you take that, and would you rather have it as one PR or split (build and shared code first, then the GL renderer and context)?

Yeah of course feel free to submit PR but for this kind of evolution I will check after the stable release,

Quote from lvasan

Hi CroqueMr,

First off, huge appreciation for the build and the R1.0.0-RC4 release! Testing on an Intel Arc GPU with LibreELEC x86 connected to a Denon AVR and Sony A80K OLED, the CB1-HDR10DVR circuit is performing exceptionally well—flawless TV-Led / YCbCr tunnel inside RGB 4:4:4 / 8-bit, solid TrueHD Atmos / DTS:X passthrough, and zero frame drops with real-time AI metadata generation (CB1-L1L3).

Feature Request: Could you consider adding an opt-in SDR -> Dolby Vision conversion circuit (e.g., CB1-SDRDVR / inverse tone-mapping) in a future update?

Currently, standard 8-bit BT.709 SDR streams rightly bypass processing and stay in "SDR / Kodi playback". Having a dedicated CB1 SDR mode that can map Rec.709 gamma into the Dolby Vision tunnel (expanding specular highlights while anchoring SDR 100-nit diffuse white to preserve tones and shadow detail) would be fantastic for SDR Blu-ray remuxes and regional web streams.

Would an inverse tone-mapping circuit like this fit into the roadmap alongside HDR10/HDR10+, or does the engine intentionally strictly restrict to HDR sources?

Thanks again for the incredible work!

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- DV & HDR to SDR are already in the pipe.
- SDR to HDR/DV : personally I don't like this kind of modification, If I add it it will be after the stable release. I need to check if this kind of dynamic range extention are very straight forward or complicated and need to involve iGPU optimization. If it needs a lot of time it will not be added.

Quote from astrotrain

I’ve been around since the first days of CE having FEL support and I watched CPM get burnt out by incessant requests while the CE team got so fed up that they banned all discussion of forks. I don’t want to see this replicated here. The code is already an enormous amount of effort that has taken over CroqueMr life over the past month. I’ve seen them delay their work to fix this which is a danger sign. I also want perfect Dolby Vision, but not at the cost of somebodies mind, job or happiness.

DP-to-HDMI conversion adds a whole new layer of complexity to code and support. Sure, it would be nice, but, frankly, not necessary. Let’s let the core work be finished and give all the devs a well-deserved break.

Np on my side feel free to share your feature request but I prefere to receive everything in github in the issue tab and please don’t be disappointed if I say no, from time to time, I receive requests that are a bit off-topic or things that are very complicated to implement. But for DP -> HDMI the main reason is the support :

- Sometime it's not possible at all to cover one kind of LSPCON
- Sometime even if you bought the exact same DP -> HDMI converter the LSPCON inside will be different.
- Sometime it's simple to enable DV for a LSPCON

That’s why I say from the start: use a native HDMI port. It’s already very complicated to port the build across so many different iGPUs, adding adapters with the "lottery" involved with various LSPCON chip models, just isn’t feasible. If we find a simple way to support them, then sure, why not, but for now, that’s not the case.

Quote from Samui67

Hi cinemaONE and everyone,

I've found the official HP Maintenance and Service Guide for my HP EliteDesk 705 G4 Small Form Factor Business PC (HP document L23140-001, June 2018).

On page 5, under Illustrated parts catalog → Option boards, HP explicitly lists:

The manual also shows the optional rear port on page 3 and documents the option port board removal procedure on page 46.

So HP officially confirms that an HDMI option board was available for this exact SFF model.

However, the manual doesn't specify the exact HDMI module part number or distinguish between version 1 and version 2.

I've already ordered an additional HDMI module and will check the part numbers and compatibility before testing it in the SFF.

I'll report back once I've tested it.

Thanks again for your help and research!HP_EliteDesk_705_G4_SFF_HDMI_Auszug.pdf

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As I said, optional HDMI board are based on DP output converted to HDMI the major part of the time. Please de not consider this kind of solution.

It is simple to check : HDMI module 3TK75AA -> picture of the board : https://www.ebay.co.uk/itm/115996621563 -> chip inside : PS175HDM = LSPCON : DP to HDMI converter https://www.paradetech.com/products/ps175/

Quote from CroqueMr

Can you share the log please.

Yeah of course feel free to submit PR but for this kind of evolution I will check after the stable release,

- DV & HDR to SDR are already in the pipe.
- SDR to HDR/DV : personally I don't like this kind of modification, If I add it it will be after the stable release. I need to check if this kind of dynamic range extention are very straight forward or complicated and need to involve iGPU optimization. If it needs a lot of time it will not be added.

Np on my side feel free to share your feature request but I prefere to receive everything in github in the issue tab and please don’t be disappointed if I say no, from time to time, I receive requests that are a bit off-topic or things that are very complicated to implement. But for DP -> HDMI the main reason is the support :

- Sometime it's not possible at all to cover one kind of LSPCON
- Sometime even if you bought the exact same DP -> HDMI converter the LSPCON inside will be different.
- Sometime it's simple to enable DV for a LSPCON

That’s why I say from the start: use a native HDMI port. It’s already very complicated to port the build across so many different iGPUs, adding adapters with the "lottery" involved with various LSPCON chip models, just isn’t feasible. If we find a simple way to support them, then sure, why not, but for now, that’s not the case.

As I said, optional HDMI board are based on DP output converted to HDMI the major part of the time. Please de not consider this kind of solution.

It is simple to check : HDMI module 3TK75AA -> picture of the board : https://www.ebay.co.uk/itm/115996621563 -> chip inside : PS175HDM = LSPCON : DP to HDMI converter https://www.paradetech.com/products/ps175/

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Attaching the logs here.

What happened in each test (the time is when the O dialog opened)

• Common pattern: every film shows the same buffer timeout at the moment the dialog opens, followed by a short burst of drops or skips. After that the log shows no more.
• Bad Apples has no drop count: Kodi’s frame statistics only exist on the Dolby Vision path. For plain SDR playback, the buffer timeout is the only evidence, so tell the author that.

Hi All

New here, i have an elitedesk 705 G5 DM (the very small form factor), has the ryzen 5 pro 3400g and I have dolby vision and 3d capable projector. The 705 does not have a hdmi but can order the 3TK74AA. Its just sitting there, would love to get a use for it, so if there is anything i can help with I am more than happy to do so.

Hi CroqueMr,

Thanks for your explanation regarding the PS175HDM and the internal DisplayPort-to-HDMI conversion.

However, I'd like to share one important finding from my own testing:

The HDMI Flex IO module already working in my HP EliteDesk Mini is exactly the HP 3TK75AA / L25757-001 that you mentioned!

Attached is a screenshot of my original eBay purchase:

With the new LibreELEC 13 build, the system detects the output as HDMI-A-1, offers 1920×2205 3D frame-packing modes at 23.976 Hz, and my LG 3D plasma automatically switches into 3D mode during playback.

So despite the internal DP-to-HDMI conversion, this particular module is already working in my Mini.

Of course, I understand that this doesn't guarantee the same result on the 705 G4 SFF. I'll test that as soon as the additional module arrives.

I just wanted to share this real-world result, as it might be useful for your development work.

Thanks again for all your efforts!

Quote from Samui67

Hi CroqueMr,

Thanks for your explanation regarding the PS175HDM and the internal DisplayPort-to-HDMI conversion.

However, I'd like to share one important finding from my own testing:

The HDMI Flex IO module already working in my HP EliteDesk Mini is exactly the HP 3TK75AA / L25757-001 that you mentioned!

Attached is a screenshot of my original eBay purchase:

With the new LibreELEC 13 build, the system detects the output as HDMI-A-1, offers 1920×2205 3D frame-packing modes at 23.976 Hz, and my LG 3D plasma automatically switches into 3D mode during playback.

So despite the internal DP-to-HDMI conversion, this particular module is already working in my Mini.

Of course, I understand that this doesn't guarantee the same result on the 705 G4 SFF. I'll test that as soon as the additional module arrives.

I just wanted to share this real-world result, as it might be useful for your development work.

Thanks again for all your efforts!

Display More

It's a very good news if you managed to have a HDMI connection with this kind of board, but Even if it works for you, it is not garranted for other, as I said, we saw a lot of different LSPCON for the exact same reference of a board, the best advice I can share is to avoid this kind of solution.

Thanks, CroqueMr! I completely understand your concerns. I'll test the additional modules when they arrive and share the results. 👍

Quote from Samui67

Could you please clarify whether the AMD 3D implementation supports Vega 11, and whether a native HDMI output is required?

Samui67 Sorry for the slow reply. cinemaONE got there first, and he's right. Hades uses his amdgpu 3D patch, so the same rule applies: the frame-packing modes are only offered on a connector the driver sees as HDMI. Vega 11 isn't the issue. Your Mini shows it well: with the HDMI module it comes up as HDMI-A-1 and gets the 1920x2205 modes, while the SFF on the DP cable is DP-3 and gets none. Only your test will show whether the SFF sees the module as HDMI-A too. One thing to know for Hades: frame packing for a 24p film also needs "Adjust display refresh rate" turned on.

Quote from ht2tweak

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ht2tweak Thanks for the video, and for showing what failed as well as what worked. Transformers and Tron dropping to HDR10 are bugs I have to fix. Your 5800H result also proves me wrong: I said this was an Intel problem, and it isn't.

On the transport setting: "As composed" sends the picture as the composer builds it, without the conversion to IPT that the default "As licensed players send (IPT)" does for profiles 7 and 8. Switching between them should never turn a sample that plays into one that breaks, so that's a second bug. If you kept diagnostics from either machine, please attach them and say which sample and which setting each one is.

Fair points on updating. A .tar update shouldn't bring a setup wizard back. Which one came back, the LibreELEC first-run wizard or the installer? Samba is off by default. Once you turn it on, the user is "libreelec" and the password is generated and shown right there in LibreELEC Settings > Services > Samba. SSH is separate: while root still has the default password it only accepts keys, so set a password first if you want to log in with one. The update instructions should say all of that, and I'll add it. I've also noted what you said about the number of options, and the overlay cost is already on my list.

Quote from lfemperor

I have already enabled the diagnostic mode by renaming DIAG-ON.TXT , played Transformers 2 until it dropped to HDR10, and zipped the hades-diag folder.

lfemperor Got it, thanks. Dolby Vision started fine with FEL. About two seconds in, a frame was rejected at the metadata and reconstruction check, no Dolby Vision frame could be shown for the next two seconds, and Hades fell back to HDR10. As I wrote above, it isn't an Intel i915 problem after all. The same error also shows up in an NVIDIA report on GitHub (issue #1). The log names the check but not exactly what failed, so that's mine to dig out. Keep your clip for now.

Unrelated to the drop: your display reports no 4K mode at 24 Hz (it lists 4K only at 50 and 60), so the film went out at 59.94 Hz. If anything sits between the PC and the display, check whether it's hiding the 24 Hz modes.

Quote from DolbyVisionFriend

Gemini Man 60fps HDR->DV + subtitles a) Hades -> stutters with subtitles or video info open

DolbyVisionFriend That's a good test case. It's the same problem as the overlay stutter you reported on the Geekom: anything drawn over a Dolby Vision picture still costs Hades too much GPU time, and at 60 fps there's even less to spare. I'm working on it for the next version, and Gemini Man with subtitles goes on my test list. A diagnostic of that playback would help, if you have a minute.

I also have your S24 sample: 4K HEVC at 60 fps, with HDR10+ that carries its own tone curve. Hades doesn't use that curve when it makes Dolby Vision. It uses the scene statistics and lets the TV build its own curve. I haven't reproduced the black screen after stopping yet. The diagnostic I asked for before (stop the clip and leave the black screen for 30 seconds) is still what I need for that.

all of people talking about hardware in this thread,...plz...stop talking about hardware....this software development thread. not hardware help or discussion topic....you are already way toooo long talking about hardware in software development thread.

go here

Thread

Dolby Vision Hardware

Hi! I’m new here and came across this project while looking for a way to play Dolby Vision Profile 7 FEL on a PC-based setup.

I haven’t bought any hardware yet and would appreciate a recommendation before I do.

my setup / use case:

• TV: LG OLED77CX9LA
• sources: UHD Blu-ray remuxes in MKV, Profile 7 FEL (single-track, BL+EL+RPU); MP4 dual track possible too
• goal: DV Standard (TV-led) output with full FEL reconstruction, no frame drops

what I’ve gathered so far:

• Intel 8th gen and newer are listed as

…

DolbyVisionFriend

October 18, 2026 at 10:55 AM

testmest Thanks for trying to help me . Currently the development is very close to hardware, so I allow that. The other thread is a buyer’s guide.

Quote from ht2tweak

Can you guys test this sample out? Getting lip synch issue w/N150 and 5800H, but perfect playback w/8745HS. Look at Freddy Mercury's lips in correlation to the audio.

Couldn't resist Freddy's call. I don't have lip synch issues on my NUC 11 i3. I even tried seeking back and forth but it was always good.
Fun fact: I had the VHS of this concert. Seeing it like this, today, is... jaw dropping.

LibreElec 1.0 RC8(22.0 RC1 Kodi)

BD menus and returning back to Top Menu works on My Best Friends Girlfriend 2008 (2 cuts seamless branching). This doesnt work right on CE 22.0 RC1 samirhul experimental build 20007 on my Ugoos AM6B+.

Seamless Branching works on Alien 1979 Anniv. UHD BD ISO.

Avatar 2009 (non-remastered) 3D BD ISO: can get to 2D Menu. Plays in 2D like it should as I dont have 3D TV.

FBI warning popups and 3 BD Menus too early as well. 3D Option comes up but it detects I dont have a 3D TV and player. So I can only play in 2D. That is normal

CroqueMr LibreElec RC4 Preview (22.0 RC1 Kodi)

Seamless Branching broken in Alien 1979 Anniv. UHD BD ISO.

BD menu issues:

Avatar 2009 CE UHD 3cuts, when return to Top Menu, all buttons are missing.

Same issue on CE 22.0 RC1 samirhul experimental build 20007 build for my Ugoos.

Avatar 2009 (non-remastered) 3D BD ISO: can get to 2D Menu. But I saw side by side view momentarily until movie started in 2D.

So far, I like Hades build. I was able to figure out the Dolby Vision settings and got Avatar 2009 CE UHD BD ISO in Dolby Vision on my Sony Bravia AH8 TV. BD menus seem to work better.

Dolby Vision worked on my two test UHD BD ISOs that I used makemkv 1.18.4 (MacOS) Profile 7 in an mkv work.

Music & Lyrics 2007 VC-1 plays right with no judder.

My PC Specs:

Gigabyte AMD Radeon RX 6500 XT Eagle 4GBvram

AMD Ryzen 5 5600-X 6cores

2TB Nvme (Windows 10 Pro)

Both LibreElec OSes was run from USB 3.0 128Gb flash drive on my PC.

I have an Oppo-203 with the Free RU 65 JB firmware to play all my BD ISO and see how their menus are supposed to work.

ht2tweak  hadesdevls i can confirm that transformers 2007 movie in mkv and in bdmv format doesn't play in DV. tried with Hades rc6 and rc8 builds. no DV.

hadesdevls may i request one small feature?

on kodi SHUTDOWN menu, i would like also to see option RESTART KODI, without restarting whole computer.

and reporting some kind of bug.

after playing transformers 2007 (in mkv and bdmv) and stopping it (pressing X) on keyboard.... under SETTING >>> SYSTEM INFORMATION >>> VIDEO i don't see DV anymore as supported display (i see hdr10, hlg and hdr10+). probably caused by transformers 2007 movie...

my hardware: amd cpu 3400g (radeon vega 11) with philips OLED808 (similar to LG C2 or C3)