Emulator

Copying this here in case it's related. Originally posted in #7143:

Super Monkey Ball (GMBE8P) Advanced Stage 10 seems to randomly stretch the screen then quickly return it to the proper size (widescreen mode detection issue?) on 5.0-12369. Dual core only, single core does not have this problem. Let me know if I should file a separate issue for this.

That one should either be part of this issue or the dualcore issue. Putting it here is fine.

Copying my comment from #12090:

I believe the widescreen heuristic is not fixable without adding per-game settings.

Metal Arms NON-widescreen aspect ratio is 1.25.
F-Zero's widescreen aspect ratio is 1.244.

Certain games have an unusual idea of what "widescreen" is so we can't fix them all with one magic number.

Just wanted to drop a quick line that Mario Party 4 is affected by this bug.

Metal Gear Solid: Twin Snakes is affected, it's always detected as 4:3 even when using the 16:9 Gecko code. The code works fine, but you have to force 16:9 in the graphics option, Dolphin autodetects it as 4:3.

Metroid Prime (Gamecube) is also affected during the battle with Meta-Ridley and Metroid Prime itself (the aspect ratio is constantly changing). The rest of the game works fine.

Pokemon Colosseum too has this issue in the Mt. Battle lobby if you go left of the entrance. Just mentioning it in case this ends up being handled on a per game basis.

Mario Smash Football / Super Mario Strikers is also affected.

When running the PAL version of True Crime: New York City, the 4:3 mode is misdetected as 16:9 and the 16:9 mode is misdetected as 4:3.

Only PAL50 seems to be affected. With PAL60, things are detected correctly, which matches JMC's experience with the NTSC version.

Killer 7 is also affected, during one of the first cutscenes the game will switch to widescreen and stay like this (haven't tested long enough to see if it switches back to 4:3 at some point).

To reproduce: start a new game, skip cutscene, say "No" for the controls tutorial, when in-game hold A until you trigger the next cutscene and skip it, another cutscene will follow directly, don't skip this one, that's the one that triggers the widescreen.

Wave Race too, it can flicker like crazy, it seems to be only on specific parts of the course, easiest way to reproduce (warning if you're sensitive to quick flashes, the flickering is pretty bad!): select "Free Roam" then the 3rd track (Southen Island) and just start driving, the flicker should happen very quickly.

Videos:

-Killer 7: https://youtu.be/RkS7u1fHsDE
-Wave Race: https://youtu.be/ZQNof1vYk7o

Tony Hawk's American Wasteland (GWJE52) is also affected. I am using the latest Platpak build avaible, 5.0-15445, and the hash of the game is OK.

No configuration settings were altered before starting the game.

A video showing the error can be found here:

https://files.catbox.moe/xwa3p3.mkv

By starting the game with the aspect ratio set to "Force 4:3" there will be no errors whatsoever. However, if the game is started with it set to "Automatic" and then changed to "Force 4:3" once the memory card starts being read, there will be a flickering glitch effect on the screen:

https://files.catbox.moe/n3yjkp.mkv

The same also happens if "Force 16:9" is chosen:

https://files.catbox.moe/ul6bux.mkv

I could not determine whether this error is exclusive to Dolphin installed through Platpak or not as the wiki page for the game doesn't mention anything about this glitch, but F-Zero GX runs fine and the widescreen toggle works perfectly.

I could not save the FIFOlog I recorded, it gave me an error when saving for some reason.