[mythtv-users] Is there a tuner limit? (problem with >8 tuners)

[Steve Smith]

On 20/08/07, Chris Wilkie - NetrinoUK <chris at netrino.co.uk> wrote:
> Thanks for the quick response Bill.
>
> I don't believe this issue is down to hardware, although I'm happy to be
> proved wrong, as the USB side of things seems to be fine.  Linux
> recognises the tuners, and is able to push firmware to them, showing
> that communications are working.  In my mind, this rules out any
> hardware issues.  I'm far more suspicious of V4L, or the driver itself
> getting upset when there are more than 8 tuners.
>
> Feel free to correct me on this - I'm no expert when it comes to
> hardware!
>
> Chris
>
> -----Original Message-----
> From: mythtv-users-bounces at mythtv.org
> [mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Bill Williamson
> Sent: 20 August 2007 12:55
> To: Discussion about mythtv
> Subject: Re: [mythtv-users] Is there a tuner limit? (problem with >8
> tuners)
>
> On 8/20/07, Chris Wilkie - NetrinoUK <chris at netrino.co.uk> wrote:
> > I've been pointed here by the chaps on the MythDora forum, hoping to
> > gain some advice on getting a box working with 12 tuners (6 x Nova-T
> > 500 dual tuner PCI cards).  I am able to get the first four cards
> > working, giving 8 tuners, but the last two throw errors when trying to
> load the driver.
>
>
> My first guess would be some sort of PCI address assignment issue.
> How many PCI slots does the board have, and which of those are sharing
> irqs/etc with your motherboard components?
>
> I know you have the "grunt" to handle that many cards, but I've never
> seen a machine take 6 high-bandwidth PCI devices, no matter how
> expensive the system was.
>
> Your first troubleshooting could be to keep the adapters from
> initializing and then insmod them one by one to see which ones cause
> trouble?
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Chris,

It's no direct help, but I'm sure I read about an initiative to get
Myth to record whole MUX streams. I.e. one tuner can record multiple
channels. Then you'd only need 5 (or is it 4) tuners, one for each
MUX...

Have a dig.

Cheers

Steve