Video-out support

Al Johnson openmoko at
Wed Aug 27 10:03:34 CEST 2008

On Tuesday 26 August 2008, Robin Paulson wrote:
> 2008/8/27 Harald Welte <laforge at>:
> > On Tue, Aug 26, 2008 at 02:46:23PM +0200, Francesco Cat wrote:
> >> Isn't USB 2.0 required for USB-to-VGA adapters?
> >
> > yes, USB2 is required for all USB-to-VGA adapters that I have ever seen
> > as a mass product.  The reason is very simple: A full-screen uncompressed
> > video has much more bandwidth than USB1 can sustain.
> >
> > I've only ever once seen a pre-mass-production prototype of a USB1-to-VGA
> > adaptor. And that was in fact an entire PXA27x based linux system with
> > something like VNC.  Just no configuration or user i/o of any sorts.  But
> > even that never made it mass-market.
> have you thought about going through the wireless interface? that's
> got way higher bandwidth than the usb port
> i found these on google; they're a bit big and not cheap, but maybe...

At those prices I'd go for a beagleboard instead. It's got the sound and video 
output capability and the USB. Add WiFi if needed, and use VNC or a modified 
NX for display. For video it's probably better to stream the file to the 
beagleboard and let it do the decode locally.

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