[linux-dvb] Re: streaming video over USB?

["Craig Procter" <cwp@mmt.com.au>]

Thanks Patrick,

I guess what I'm wondering about is the difficulty it would be to
redirect the streaming USB video to a streaming ethernet multicast 
(preferably keeping it in hardware).. but that may be too much of an
'ask'.

I was hoping the USB video may already be a 'broadcast' of the MPEG2 TS
packets, so that a box could be easily built to take the USB and convert
it to an ethernet multicast.

This idea isn't really DVB-T Linux related, so I won't continue it here.
But if anyone is interested in discussing it over email then please feel
free to email me.

cheers,

Craig Procter
cwp@mmt.com.au


-----Original Message-----
From: Patrick Boettcher [mailto:patrick.boettcher@desy.de]
Sent: Tuesday, 18 May 2004 6:14 PM
To: linux-dvb@linuxtv.org
Subject: [linux-dvb] Re: streaming video over USB?


On Tue, 18 May 2004, Craig Procter wrote:
> Is the video packetized by the USB device or is it sent in a constant
> stream which the software on the PC then 'grabs' and decodes/shows on
> screen?

Hi Craig,

For Twinhan VP7041 the dvb data is directly streamed to the software, and
the software does the rest (So no special repackaging by the device).

> Is there a 'universal' way which has been adopted for streaming
> USB video or does each manufacturer have their own way of doing things?

Since the USB devices have different endpoint types (e.g. Hauppauge dec-t
has isochronous EPs for data (Alex, correct me if I'm wrong), VP7041 has
only bulk endpoints for everything) and so different access method, I'm
not sure if a abstact usb driver is useful.

> (ie: software has to be tailored to each different USB video device).

No, in Linux the driver build an abstract framework for the applications,
this could be possible in Windows as well, but I don't know.

best regards,
Patrick


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