Comments (11)
The chroma bleed issue is unfortunately not fixed by evwii for now (it would be amazing if it could be fixed). I have tested both Wind Waker (via Nintendont) and Skyward Sword at 1080p and 480p via HDMI as well as 480p via component while using evwii 0.2. The issue is most clearly visible in skyward sword when looking at the white outline/glow around the goddess statue in the intro - the glow on the right side of the statue is clearly non-white due to the bleeding. For Wind Waker I set evwii to 640x480 to try and reduce scaling artifacts, but bleed could still be seen on Link's right side during the playable intro segments. It honestly looks like a 1-2 pixel horizontal chroma/luma offset (though how that sort of bug is even possible I can't imagine). I can post uncompressed screen captures if that would be helpful.
from evwii.
For future reference here are comparison captures, both were taken with the following fixes applied to try and get as raw a framebuffer capture as possible:
- 480p fix
- Deflicker Filter disabled (extended)
- Video width: Framebuffer
All captures are fully uncompressed (rgb24) taken with a Magewell capture card and saved to a PNG with ffmpeg.
First capture is from the Wii and was captured unscaled with an OSSC connected with component cables using optimal timings.
Second capture is from the Wii U in vWii mode outputting 480p with evwii set to 720x480 and was captured directly via HDMI.
For dramatic effect here's the zoom in (scaled nearest neighbor):
Wii:
Wii U (evwii):
Hopefully this helps!
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I think I already said about this a bit on the linked threads when testing the evwii first version output, but the chroma shift seems to vary between a very ugly one and a fine-ish one according to how the software sets the video output and the VI (and if it reinitializes it or not too?). I imagine this is a bug in Nintendo's implementation on the Wii U as of course doesn't happen on GameCube and Wii.
If you output on 1:1 without crop and look carefully, when there's more chroma shift, the most horizontal pixels of the vWii output are green on each side. It also always crops one pixel on the game image right side when there's more chroma shift. There are some images that show that below (all with evwii for the Wii U).
### 300% zoom
from evwii.
Thanks for mentioning this, I completely missed those posts while skimming over the "Fixing vWii Mode" thread.
Regarding the first issue:
Color Matrix Transformation is disabled in vWii mode, which might confirm the suspicion in the original thread:
On vWii I believe the issue is that the game is rendering SD 601 colours, but vWii is neglecting to convert them to HD 709 colours before outputting them as 709 colours over HDMI.
Not too sure about the second issue though, the pixel encoding format is set to YCbCr 4:2:2 while in vWii mode.
from evwii.
Not too sure about the second issue though, the pixel encoding format is set to YCbCr 4:2:2 while in vWii mode.
Interesting, unless the view port fix fixed the colorbleed issue. (that or it's just purely caused by that color space issue, or something else entirely. One step at a time I suppose)
Also awesome to hear I was able to help somewhat.
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According to NoobletCheese, the chroma bug seems to be coming from the a misalingment of the CbCr channels, and that it could be solved by outputting RGB instead of YCbCr.
Could a toggle for RGB/YCbCr be added to evWii?
Original post: https://gbatemp.net/threads/fixing-vwii-mode.573265/post-9758960
from evwii.
I used Nintendont to force different video modes, and I can confirm this behavior:
Just a reminder, the chroma is usually slightly shifted to the left and it is yellowish.
- Running PAL games on PAL WiiU would not cause bleeding to the red
- Running NTSC games on PAL WiiU would cause bleeding with the red-shifted to the right
The red shift would stay in the HBC and SM, so there would be no more yellowish bleed.
(Shift to yellowish does reset after the reboot)
- The thing that I had a 100% chance to reset the red bleed is setting
TV Type
to60Hz (480i)
and then changing back toEDTV/HDTV (480p)
Most of the time, only changing to60Hz (480i)
would be enough to fix it.
When booting the game, staying at 50Hz is the goal:
- Forcing NTSC, MPAL, or 60Hz on PAL game also results in the red bleed
- Forcing the NTSC game in 50Hz mode would not cause the red bleed
BUT YOU MUST NOT USE Gamecube IPL, and @GaryOderNichts knows why.
The__VIInit
reasons
from evwii.
I think this would require a rewrite of the DMCU firmware to fix. And I don't believe anyone knows in enough real great detail how the DMCU firmware works exactly to be able to rewrite it to fix all of this.
from evwii.
I think this would require a rewrite of the DMCU firmware to fix. And I don't believe anyone knows in enough real great detail how the DMCU firmware works exactly to be able to rewrite it to fix all of this.
I have the DMCU firmware mostly reverse engineered and partially reimplemented. Unfortunately that doesn't automatically help with fixing the chroma shift issues.
There's a lot more testing required to figure out what exactly causes it.
from evwii.
Hopefully this is something that can be solved in the near future, seeing as DMCU is mostly reverse engineered. Nintendo really dropped the ball with the Wii U.
from evwii.
Is latency also something that people have reproduced/tested? I've noticed it, although I haven't tested it, and its been reported as about 20ms, which is pretty high. I'm using a European Wii U, if that makes a difference.
from evwii.
Related Issues (10)
- [Suggestion] Gamepad support HOT 1
- [Feature Request] Fix wii u powering down if gamepad is plugged into USB port while in vWii HOT 4
- [Feature Request] Dissabling the Deflicker Filter vWii Wide HOT 1
- Request:Gamepad as an Classic Controller HOT 2
- [FEATURE REQUEST] Color Space toggle HOT 1
- 480i support HOT 1
- Weird Screen Tearing Issue on vWii HOT 6
- Restore settings when uninstalling HOT 1
- Disable Deflicker Filter HOT 2
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