USB video/audio capture?

[skeptic]

I need a USB s-video, component, or composite plus audio capture option.  If it adds digital tv turner, great, but my analog stations are already going the way of the dodo, so I'd rather not have the extra size and wasted money of an analog tuner.  None of the options I know of are fully supported by linuxmce, anyone have suggestions or am I stuck waiting until the Hauppauge HD PVR or WinTV-HVR-1950 is supported?