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Which screen has component? Your TV/play screen? If that's what you're talking about, it depends on what capture device you have.

If you're going with the usb boxed version of the avermedia,haupp, there breakout cables only output to component, not HDMI/VGA/HDMI.

In which case, you need to get an Component > VGA adapter. like THIS: http://www.monoprice.com/products/product.asp?c_id=101&cp_id=10114&cs_id=1011407&p_id=7113&seq=1&format=2

That's the one I use for PS3>Component cables >Capture Device>Component Cables>Analog Converter>Asus Monitor for playing.

If you're doing the blackmagic intensity pro Internal card route, you can just input component, and output HDMI without any extra hardware.

For now I wait to see which device is better for the setup i have.
Yes I'm talking about my play screen (PC screen there, samsung for now and iiyama soon enough)
Does the adapter adds any kind of lag ?
I think I'll go with the avermedia, but Jaxel kinda looked down on it, what's your opinion ?

The adapter may introduce 1-frame (consistent) lag to the conversion process, but I had a few players play on similar setups and there has been no problems. Should not be too big of a problem since you're using a monitor which is pretty lagless to begin with.

As for the avermedia (USB box i assume?) it's actually pretty good. I use to run an avermedia+converter output to my ASUS. The downside, as everybody mentioned, is that you cannot add the aver as a camera source, so you'll have to resort to screen capture.

So, to stream, you'll basically have to do this: Run the software that came with Avermedia, and it'll have it on it's own window. From there, you use X-split (with the option to hide xsplit's own window) to select the regon to record (screen cap), and then do everything with that. The side effect is that the quality may not be as good as Blackmagic.

http://www.youtube.com/watch?v=q9PfyvhDOew

As you can see, the quality is still very viewable, though there maybe occasional screen tearing. For all that matters though, I think haunts uses a non-blackmagic (haupp) and does the screen cap thing, and the iplaywinner streams look good. (see southtown KOF XIII streams)

I personally upgraded to an blackmagic intensity pro, but only because I have a core i7 2600k + z68 mobo with 16gb of ram so I can handle the system reqs. For people who's running with something less powerful, having a box which does it's own encoding/compression inside the box before feeding it to the computer (Haupp/avermedia usb boxes) maybe a better solution.

Thanks a lot for your help.
I looked your video and this quality is fine with me (i thought it would be worse when i read you :p).
The screen cap thing ? what do you mean ?
(i often look the iplaywinner streams and always enjoy it in terms of quality)
From what you said I may buy the avermedia (usb box)
I have a asus G51jx laptop with a intel core i7 Q720 1.60GHz and 8GB of ram, will it be okay ?

That should be fine... IIRC the Q720 can be turbo boosted to 2.8ghz, so as long as you set the power setting to full power instead of balance/power saver, you should not run into any big problems.

For the screen cap thing, Let's say you have a streaming program, like wirecast. To input your video feed, you have to add a "camera" source, displaying the media that you want, be it a video feed, picture, w/e. When you use Blackmagic, wirecast will read it as it's own source, and add it into the stream.

When you use other devices by aver or haupp, you cannot add it as a source due to them not using something called "directshow". Therefor, to get around that, and still add the videogame feed into your stream, you need to use a "screen capture", that is, you litearlly select a space on your screen, and record whatever's displayed in that spot.