Blur Busters Forums

Chief Blur Buster wrote: ↑

17 Nov 2022, 18:54

Milincho wrote: ↑

17 Nov 2022, 10:09

Ah, just read about QFT (Quick Frame Transport), but I see that's an HDMI 2 feature. This Epson 6040UB projector is HDMI 1.4...

Unofficially QFT can be hacked onto VGA, DVI, DisplayPort and any version of HDMI. It's just a custom resolution tweak.

QFT, for example, reduces the latency of doing certain fixed-Hz-modes on DLP projectors, for example -- even though the DLP projectors does not officially support QFT.

Since unofficial QFT is not a VESA mode or HDMI Forum mode, but you can still DIY-create your QFT mode via Custom Resolution Utilities.

QFT works even on early HDMI variants if the bitrate allows and the transceivers on both ends supports it.

Tried 120Hz with 1080p and 720p but no dice. It goes black and says "Not supported". Same with 100Hz.

All the other refresh rates I tried (72, 75, 90, 96) show different levels of frameskipping.

This is the base custom resolution I am using now to avoid frame drops in video playback.



How can I try this QFT?

Undocumented QFT is very hit and miss. It appears that your projector does not support QFT.

You could *try* 120Hz with reduced resolution and large vertical blanking, to see if it works.

Chief Blur Buster wrote: ↑

17 Nov 2022, 19:38

Undocumented QFT is very hit and miss. It appears that your projector does not support QFT.

You could *try* 120Hz with reduced resolution and large vertical blanking, to see if it works.

Tried doubling the Total Vertical lines in 480p



but same result... black screen and "not supported" message.

So I guess this is the end or could I try some other thing?

Any other general improvement recommendation to my base custom resolution settings?

Looks like this is probably a dead end at this stage. Other tweaks would probably require too much advanced hacking.

It is mainly newer display technologies that are QFT-tolerant.

Chief Blur Buster wrote: ↑

17 Nov 2022, 20:41

Looks like this is probably a dead end at this stage. Other tweaks would probably require too much advanced hacking.

It is mainly newer display technologies that are QFT-tolerant.

Seems like overclocking DLP projectors is much more succesful. Don't know why the Epson 3-LCD tech is so tight with refresh rates and does frameskipping at *anything* over 60Hz. It does 120Hz in the 3D mode, even if it displays only 60Hz in info page, we know it's 60Hz per eye, so the capability is really there...

Anyway, thanks for the help. Really appreciated.

Milincho wrote: ↑

17 Nov 2022, 21:50

Seems like overclocking DLP projectors is much more succesful. Don't know why the Epson 3-LCD tech is so tight with refresh rates and does frameskipping at *anything* over 60Hz. It does 120Hz in the 3D mode, even if it displays only 60Hz in info page, we know it's 60Hz per eye, so the capability is really there...

Anyway, thanks for the help. Really appreciated.

Best to abuse the 3D mode, force 3D mode even if you only use 2D, and you'll get 120Hz for 2D. Aren't you able to do that? Make sure you stick to the only resolution that 3D mode supports -- sometimes 640x480 is not an option and you must use 1080p or 720p or 800x600 or 1280x800 whatever 3D Mode specifies.

Does any 120Hz mode show up in the EDIDs? Check all resolutions and find which one has a 120Hz mode (it might only be the 800x600 one, it might only be the 1280x800 one). Alternatively try forcing common 3D Mode resolutions (with 3D Mode enabled in the projector) and see what happens. 3D mode works fine in 2D, if it's a frame sequential mode, and it becomes a normal 120Hz 2D mode.

Once you find the working 120Hz mode, create the QFT 60Hz mode only from the EDID timing numbers of that working 120Hz mode, via the Vertical Total Calculator.

Now, if 120Hz does not show up in the EDIDs, when 3D Mode is enabled, then you've got to reverse-engineer it by testing common standard 3D Mode resolutions (definitely not 640x480). Once 120Hz works, then use ONLY that to create QFT 60Hz. (This use case is useful if you've got 60fps 60Hz content that you want the lowest-lag from without stutters). Now, in theory you could try to QFT the 120Hz (some LCDs can QFT refresh cycles faster than max Hz, but it's only for full-pre-framebuffering panels)

Remember some 3D modes require low resolutions (1280x720) on 1080p projectors, see the very old 120Hz from PC to TV HOWTO, which is almost ten years old.

Chief Blur Buster wrote: ↑

22 Nov 2022, 15:57

Best to abuse the 3D mode, force 3D mode even if you only use 2D, and you'll get 120Hz for 2D...

There is no 120Hz mode listed in the EDIDs.

According to the manual, 720p is the only 60Hz mode with Framepacking (not sure if this is the same as Frame Sequential)



But tried 1280x720@120 and 1280x800@120 with "Exact Reduced" timings and none worked.

I can't force the Framepacking 3D mode in the projector menu, only "Side by Side" or "Top and Bottom". It seems that Framepacking mode is activated when the "3D Mode" is on "Auto" and the projector receives a 3D signal from a 3D bluray player. This means it could be activated somehow from Windows, but I have no idea how.

Using "Side by Side" or "Top and Bottom" 3D modes the projector info displays "60Hz", but that's the info about the input signal, not the output.