As per official specs, Intel Celeron 847 employs a thing called "Intel HD Graphics":
Was ist "benutzt" hier, it doesn't really matter. What matters for nice smooth operation of XBMC 12.0 is the support of GLSL (see here). While 3D gaming is nowhere close to what "better" Intel chips with HD Graphics 2500, 3000, 4000, 4600 can offer, HD video rendering can be achieved with better smoothness and FPS on high profile HD streams just fine
"HD Graphics (Sandy Bridge) 6@350 - 1100MHz
Codename Sandy Bridge
Architecture Sandy Bridge
Pipelines 6 - unified
Core Speed * 350 - 1100 MHz
Shader Speed * 350 - 1100 MHz
Shared Memory yes
benutzt LLC Cache
DirectX DirectX 10.1, Shader 4.1
technology 32 nm
Date of Announcement 01.05.2011"
XBMC 12.0 can now support more delicate tuning of rendering quality for HD video playback: just like all other "traditional" media centers do. However, there's not much hardware detection going on inside XBMC, so defaults like "Auto detect" in Settings -- Videos -- Playback for rendering mode just don't work.
My tuning of Video Playback settings in XBMC 12.0 is as follows:
-- "Advanced shaders (GLSL)": set it explicitly (instead of default "Auto detect" which detects nothing);
-- "Allow hardware acceleeration": (VDPAU) and (VAAPI), both ON, even if one of them feels redundant for playback. There's this XBMC UI that can be made to redraw faster, if anything;
-- "Activate Teletext", "Scale Teletext to 4:3", you may want set both to OFF (you're watching your 1080p "Game of You-Know-What" stream, why would you need a teletext overlay on top of that joy?);
-- "VDPAU Studio level color conversion": set it ON.
The rest of the options can be left on their defaults.
For Live TV, there's not much you can do after you tuned Video streaming, so leave it alone.
While using XBMC, try not to leave Chrome, Firefox, or whatever competing URL resolver running in the background, so URL resolvers of XBMC would have less trouble in resolving and streaming some rare HD stuff.
Use DD-WRT (or much more expensive "gaming", "low-latency", etc.) router for stable delivery of HD streams to your Acer C7 Chrubuntubook. SD (about 480p) streams become smoother and nicely anti-aliased, HD streams (720p at least) get rendered very sharp and smooth.
ARM Chrubuntubook may not have these fine options available for tweaking, both in code and in hardware. But you can try, who stops you?
Enjoy!
Here's unedited sample of 720p stream from Vimeo add-on (recorded by my $3 + 2 cigarettes worth of Canon SD940 IS camera; original is silky smooth and sharp):
Some PBS 720p trailer:
Both clips are in free public access, I guess.
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