Some final observations about Katsukity's PS Vita capture card:
When first started recording the Vita display with Fraps, I noticed I only got a small portion of the screen
similar to what MakiManPR had with his Katsukity 3DS XL capturing. So after resizing the window, I finally got a capture I could work with, and it was 960x544 just like the Vita's resolution, except I had to crop 8 pixels from the top and 7 pixels from the bottom before resizing. I didn't think that much of it at the time.
I noticed a slightly bouncy picture, which I eventually was able to stabilize by going to Config > Calibration and setting H_SYNC to 36. There's no way to save that setting and editing mPSV_view.ini doesn't do anything either.
My captures were 960x544, but borders would appear because I was capturing while the viewer window was maximized and full screened (it was squishing the original video so the borders could also fit into 960x544). Clicking Same size adjustment > dot by dot x1 fixed that weird resolution problem (full resolution and no more borders), and it also got rid of the screen tearing I was getting.
Even recording the window in the first place was a bit of a headache. After wondering why the picture would freeze and I'd end up recording my entire desktop instead of the Vita viewer, and noting that pressing the Home button in-game would at least refresh the screen, I realized there needs to be movement on the Vita viewer before recording. I noticed I stopped having the problem once I plugged the Vita in to charge it, and that little charging animation on the home screen was enough to solve that problem. Before I would only start recording when my game was paused (either with Start or with the Home button), and the Fraps counter didn't show until there was some movement, and I didn't realize the viewer itself was frozen because my game was paused, so yeah... that caused me a bit of grief.
In the end, it's still awesome, and I'm amazed I was even able to get the mod done at all (ordering from the Japanese site and shipping my Vita to Japan), but yeah I wish I could've got it from loopy. The 3DS drivers and software from loopy worked "out of the box," and I'm still using the ground loop isolator that I got from loopy for Katsukity's Vita capture card, since you do need a sound filter. And of course, I could've had quicker, cheaper shipping (being in the same country and all), and my money staying in the US would've been great too.
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EDIT: All right, one more observation. There's no problem using the Vita capture card and the official Sony PS Vita cradle. You just need some space on the bottom. I use two decks of cards.