[mythtv-users] MythTV and USB hubs

Jim Minihane min02jsm at minihane.tzo.com
Thu Mar 16 17:53:04 UTC 2006

If it's a quarter of that, it should still be enough. If each Plextor is
using 6Mbps, that's only 24 Mbps. WAY under any PCI bus, harddrive I/O,
etc. Now I just have to find a couple of cheap used PCs that have USB2.0
ports in them. Otherwise I might as well just get a 4 port USB2.0 card and
forget the hub.
Experiments, experiments, experiments.

-----Original Message-----
From: Brian Wood <beww at beww.org>
To: Discussion about mythtv <mythtv-users at mythtv.org>
Date: Thu, 16 Mar 2006 10:32:46 -0700
Subject: Re: [mythtv-users] MythTV and USB hubs

> On Mar 16, 2006, at 10:24 AM, Jim Minihane wrote:
> > Is there any reason I can't use a USB 2.0 hub to connect 4 Plextor  
> > M402Us
> > or  other USB capture device to a MythTV backend? I understand that  
> > the
> > Plextor 100U doesn't have hardware encoding so would require more
> > bandwidth. But USB2.0 is 480Mbps. Thats a LOT of video. Any issues  
> > anyone
> > knows about? The idea of getting away with just the onboard USB  
> > ports is
> > attractive.
> >
> I don't know for sure about any problems, but I do know that in the  
> real world that "480 Mbps." is seldom if ever achieved.
> That bandwidth is shared among all devices on the bus, and if you  
> have a hard drive or two that will slow things down. Hubs can hurt as  
> well, as can buggy motherboards and bad drivers.
> Firewire is officially slower than USB 2.0 (400Mbps.) but I think the  
> world opinion is that it is faster in real-world applications than USB.
> I don't know what the actual sustained bandwidth limit of USB-2 is,  
> but I can guarantee you that it is less than 480Mbps. Still, it might  
> well be adequate for what you describe.
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