Re: OT: Why is usb data many times the cpu hog that firewire is?

Oliver Neukum
2005-02-21T17:58:47Z

Am Montag, 21. Februar 2005 18:16 schrieb Gene Heskett:
> Greetings;
>
> Motherboard is a biostar with nforce2 chipset, 2800xp cpu, gig of ram.
>
> I've recently made the observation that while I can view 30fps video
> from my firewire equipt movie camera with a minimal cpu hit of 2-3%,
> but viewing the video from a webcam on a usb 1.1 circuit takes 30-40%
> of the cpu, at half the frame rate.
>
> Do I have something fubar in the usb? Or is this just the nature of
> the beast?

A video stream over usb1.1 must be compressed due to bandwidth available.
Decompression needs cpu.

Regards
Oliver