Think its clear the Llano grafics card > sandy bridge grafics card.
It's got to be drivers. Even the older, more CPU-heavy IGPs
aught to be able to operate more smoothly for video playback w/ post-processing, even when dropping frames. TBH, I've had no problems with older nV and AMD cards and IGP, on elderly machines, playing back h264 that they just couldn't do quite well enough. But, if the frames drop in such a way that there's no stuttering, it's not a big deal, unless you are watching a stats dialog/OSD.
I can't personally speak the SB's IGP, but every generation that preceded it had similar behavior to what the video shows, if not quite so bad, IME
(can't blame AMD for picking the most convincing scenario they could, though). There's definitely enough CPU and GPU power to handle the job, and more IO than any non-server needs, pretty much leaving those in management over the graphics driver people.
It's not that Intel's IGP is
bad...it's just that they haven't decided to make it
good. Meanwhile, AMD's is both
good and
cheaper.
For a desktop, I'd get a 8400GS, which might even be weaker than any Intel HD IGP, and call it a day
(8400GS battle cry: "I'm not a FX 5200!"). For mobile, that generally doesn't work, and all that platform mumbo jumbo starts to matter.