Gamecube internal resolution – 1920×1080?

[Kadano]

Hello. I've read on the German Wikipedia that the Gamecube's flipper GPU is capable of resolutions up to 1920×1080. Does anyone know if that's true? I was not able to find a trusty source.

Also, I have the official component cable that I use to record gameplay. Unfortunately, when I choose progressive mode, the analog video ports (composite, RGB/S-Video depending on PAL-/NTSC-Gamecube) are disabled. This is bad because I need them for the CRT that we play on. Progressive video would be much better for capturing as no deinterlacing would be necessary.
Now I'm pretty sure that this is only a software problem, so has there ever been an attempt to fix this so that both component and interlaced outputs are active at the same time?
I have a Qoob Pro installed in my PAL Gamecube, by the way.

[Extrems]

GX and VI maxes out at 1022x1022.
It's impossible to output both 50/60p and 50/60i, use a cross-converter.

[Diminuendo]

I'd be interested in what situations the gamecube can support the higher resolution, obviously we are not going to be playing RE4 in nearly high def, but maybe some homebrew can do well with it.

hell, maybe with some lower resource needing gamecube games we can get away with widescreen forcing by adding extra horizontal resolution, rather than squishing a 16:9 image into 4:3

[Kadano]

1280×720 is slightly less than 1022×1022. Is it possible to force the Gamecube into putting this resolution out?

What is a good cross-converter that has no lag on its interlaced output?

[Diminuendo]

I'd think maybe we could for an optimized game made for that resolution if the chipsets support it, but I doubt it otherwise, I was suggesting trying to squeeze in a couple of extra pixels, whilst your suggesting effectively quadrupleing the original resolution, when games on the cube already have lag at standard serf, I don't think that would be possible with a playable framerate