[opendtv] Re: Can't stream HD?

  • From: Ron Economos <w6rz@xxxxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Sat, 13 Dec 2008 17:12:14 -0800

Yes, USB is the bottleneck. The Divicatch tops out at about 80 Mbps
(just capturing to disk) on my Dell 2.6 GHz PC at work. Fine for
broadcast streams, but not so good for content distribution where
some folks want to do I-frame only 4:2:2 HD MPEG-2 at 150+ Mbps.


John Willkie wrote:

I guess I need to ask Regis about Enensys' plans for M/H support on these units.

As to the studly PC, that's mostly due to the USB interface, and I suspect that the upper bit limit on DVB-T/H would prevent that from being much of an issue. Even SCTE transport streams aren't usually above 38 mb/sec.

Even the Dektec PCI cards (which do less hardware processing than do the DVEO/Computer modules hardware cards) have no problem rendering a single program service on my 2.66 ghz single core Celeron box. USB is a whole different matter, though.

John Willkie


*De:* opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] *En nombre de *Ron Economos
*Enviado el:* Saturday, December 13, 2008 4:40 PM
*Para:* opendtv@xxxxxxxxxxxxx
*Asunto:* [opendtv] Re: Can't stream HD?

The Enensys Divicatch ASI works with VLC. In fact, there's a copy of VLC
on the Divicatch installation disk. Of course, you need a truly studly PC
to play back high bitrate streams.



John Willkie wrote:

And, I should point out, I know of no plug-ins for Windows Media Player or

VLC that provide this functionality either.  Part of the problem is the "up

to 216 mb/sec" nature of DVB-ASI.  Much simpler to figure out which program

service within the transport stream to render than to process the entire

transport stream.  That's what non-professional gear does.

What you are referring to is the creation and analysis tasks of the 1990's,

and in non-broadcast environments.

In broadcast environments at least, they are much different these days, and

DVB-ASI (and to a small extent, SMPTE-310) are simply required.

John Willkie

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