[mythtv-users] Where to dedicate processing power?

Jim Minihane min02jsm at minihane.tzo.com
Wed Mar 8 22:37:28 UTC 2006


Sorry, another follow-up.
Since I won't be encoding the video on the capture card, what's a good
compatible frame grabber? For one frame grabber and a DD5.1 input, how much
CPU would be needed for MPEG2 encoding? MPEG4?

> -----Original Message-----
> From: mythtv-users-bounces at mythtv.org [mailto:mythtv-users-
> bounces at mythtv.org] On Behalf Of Steven Adeff
> Sent: Wednesday, March 08, 2006 6:06 PM
> To: Discussion about mythtv
> Subject: Re: [mythtv-users] Where to dedicate processing power?
> 
> On 3/8/06, Jim Minihane <min02jsm at minihane.tzo.com> wrote:
> > This arrangement I've suggested is more of a "proof of concept" for me.
> I
> > want to understand how the system can be "broken up". I have another
> thread
> > running asking about capturing DD5.1. One solution was an integrated
> SPDIF
> > input on the mobo. This would require 1 machine per tuner. It would
> probably
> > be the weakest machine(s) in the system. Don't worry about network.
> They'd
> > be in their own small network 10/100 or Gbit.
> > When it comes time to implement, I'd like to be able to add additional
> > tuners if I want to. The RAID will most likely be a 3Ware 9500S-12 or
> > 9550S-12 card.
> > Here's my vision (bear with me)...
> > I have a 19" enclosed telecom/RF cabinet. I'd want 4+ DirectTV boxes
> > connected 4:1, 2:1, or even 1:1 with slave backends capturing S-Video
> and
> > DD5.1. They'd be managed by the Master backend with no tuners. The
> > RAID/storage would be in the master backend. Several TVs and a projector
> in
> > the house would be connected by their frontends to the master. If I
> wanted,
> > then I could add another machine to do commercial cutting.
> > Call me nuts, but this sounds pretty good. I don't mind spending the
> money
> > for hardware if I know it will all work when I hook it up. 1, 2, and 4U
> > servers are pretty cheap on ebay.
> 
> I would still use a master backend that does the capturing and leave
> the frontends tuner-less.
> 
> To capture with DD5.1 will require a non-PVR card (ie regular tv tuner
> card) using the CPU to do video encoding to match up with a 5.1 input
> signal from your soundcard. I don't think all the DirecTV channels
> send 5.1, so what I would do is setup one or two tv and sound cards
> for 5.1 capture and a PVR500 for regular channel capture, then set up
> the 5.1 channels only on the inputs it has, so when you want to record
> those channels it has to use one of the 5.1 setup instead of the other
> two DirecTV tuners.
> 
> Get a motherboard with onboard 5.1 soundcard and get a second PCI
> soundcard. With a PVR500 and two TV cards you'll only need 4 PCI slots
> for tuning. Get a fast enough processor to handle the encoding and
> MySQL tasks.
> 
> --
> Steve
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