[linux-dvb] Re: Twinhan again, (Re: Help, failing to...)

[Patrick Boettcher <patrick.boettcher@desy.de>]

On Tue, 28 Sep 2004, Soyeb Aswat wrote:

> > I don't know about the magic Box, but all dibusb
> > device I'm aware of are
> > USB 1.1. I saw that KWorld and some other vendors
> > say that it is 2.0 .. it
> > isn't believe me. :)
> > I think the vendors mean you can also use the device
> > on a usb2.0
> > controller, but the speed won't change.
>
> Is USB 1.1 speed enough to run a DVB stream from or is
> the resolution etc reduced?

Receiving one channel (video+2audio+teletext) without reduction is
possible and it works.

> What about other devices on the bus, do they suffer?

My mouse doesn't :), but USB is a serial bus, so devices share bandwidth,
but never tried, yet. Maybe later today..

> How about if you plug the dibusb device into a USB2.0 controller, would
> other devices suffer then since you've got greater total bandwidth? What
> about multiple dibusb devices on a USB 2.0 controller running at the
> same time, is that even plausible?

IIRC USB2.0 controllers have a 1.1 bus as well. Then if you would connect
a USB1.1 device to USB2.0 port, the hcd would manage it as a USB1.1
(FULL SPEED) device.

> And finally, do they provide a TS or only a PS?

TS. I pass it to sw_demux, because dibusb does not have a real hardware
pid filter. See the source for more information.

Patrick
--
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