Mackerel Ice Cream

I have been trying to figure out how to get AV out of the Gamecube to capture card/modern TV with high quality visuals, but then I consider, maybe there is a better/another solution that will fit most of my consoles instead of just one. The short answer is what you recommended. OSSC. I was looking at this device. However, I have come across the Epiphan below. Time for more research. Thanks.
 
It seems like insanity is just around the corner for me already even though I just started this journey. I was looking at increasing the video quality of the Gamecube, but wanted a solution for all of systems. That might be a fool's errand. Looking into dot crawl and analog capture. Thanks.

Start at the source. If you're just using the regular composite video cables the consoles came with, you're going to get dot crawl. This wasn't too noticeable back in the days of standard def CRT TVs, but blow that up to 55" at 1080 and they'll be very noticeable. If your video adapter has a good comb filter, it can lessen the dot crawl but you'll still take a quality hit. Garbage in, garbage out.
 
https://en.wikipedia.org/wiki/Dot_crawl
https://www.avartifactatlas.com/artifacts/dot_crawl.html
 
You want to start with the best quality signal you can. RGB mods exist for most consoles, but if your console can just use regular component or S-Video cables then that's 95% as good for almost no effort. Then use an HDMI adapter to digitize the video and record it to a file with a capture card or dedicated capture device.
 
 
Just bear in mind that your real-hardware capture will never look as crisp as a screen recording of an emulator (unless you're capturing a purely digital signal like HDMI). Chasing that perfection is the path to madness.

If you have a HDMI capture card, you'd want a proper upscaler to convert your 480p / 256x244 snes image to a bigger resolution ... one of the best is this one (but expensive) : https://videogameperfection.com/products/open-source-scan-converter/
 
other upscalers here...
 
without an upscaler 
 
I would look into a capture card or device that can capture uncompressed RGB from VGA or something that keeps the input signal as unchanged as possible. 
For example, I'm thinking of epiphan products  like dvi2pcie card (accepts both analogue and digital, has dvi-i  so you can use passive dvi-vga passive adapter to capture raw rgb)  or epiphan av.io usb 3 grabber (same deal, has dvi-i, use dvi-vga adapter to capture vga)
 
Here's for example Epiphan DVI2pcie card (though not tested, but it's probably fine) : https://www.ebay.com/itm/325232137678 - and here's a brochure for it saying it can do 640x480 at up to 85 fps and 1920x1080 at 60fps : https://www.epiphan.com/wp-content/uploads/2015/06/epiphan-dvi2pcie-brochure.pdf
There's a version with vga connector here (but don't recommend it) : https://www.ebay.com/itm/255704475791
Anyway, problem with these discontinued models is that they may only have drivers up to Windows 7, you'd have to check, but in terms of raw capture the quality should be very good.
 
USB models don't need drivers so they're more future proof.. if you can get an old Epiphan AV.io USB grabber, you'd be golden.
 
Note the epiphan VGA2USB or DVI2USB usb grabbers are bad, really slow, can only do maybe 25-28 fps at 640x480, because they're based on usb 2.0 
 
Once you have the raw vga capture sorted, you need to figure out a way to convert composite or svideo to vga ... gamecube apparently outputs 720x480 SD, but actual area used by games will be much smaller, so you'd just be able to crop the area you want in post-processing. 
 
SNES has really low resolution, like 256 x 244 ... so you probably capture 512 x 480 and do deinterlacing or something to get good picture. 

The second monitor is wide, really wide. 7680 pixels long. 3x Ultrawide. ha!
When I made this thread, I was thinking about monitor configuration within linux and how it's like ten times easier in linux. Configure your monitor setup, save config file, and move on with your life. Actually, I could use some advice on using Intel and Nvidia drivers together in Linux. I couldn't get it to work with multiple monitors. ^The same exact setup but in Linux. You're using Intel HD Graphics and Nvidia drivers together to display multiple monitors within Linux? How many monitors are you using? Which Window Manager are you using? What drivers are you using for Nvidia and Intel? Thank you!

The second PCIe x16 slot only has 4 lanes available. The first x16 slot has all 16 lanes. For the best performance, the main video card must go to the first x16 slot.
 
PCIe version doesn't matter anyway, both cards are PCIe 3.0 and that's how fast each lane will talk.

It looks like it was the PSU that was bad, because the replacement hasn't had any issues since it was replaced.  But right before I installed the backup PSU I couldn't get the computer to fail during post. Who know? However, thank you for replying and helping out.