[vdr] Dual DVB-S2 Tuner cards

James Courtier-Dutton james.dutton at gmail.com
Fri Jun 25 14:43:32 CEST 2010


2010/6/25 Andre <vdr at dinkum.org.uk>:
>
> On 19 Jun 2010, at 09:00, Goga777 wrote:
>
>>
>> which problems do you have with hvr4000 ???
>
> I get semi random glitches in the recordings that the Satix doesn't get also my Nova S+ (before it packed up last week) doesn't get the glitches.
> It's significantly better since the upgrade to Ubuntu 10.04, even though I was running 2.6.33 kernel on 9.04 and latest v4l drivers.
>
> My next debugging step will be to ditch my Nova T500 for a while, after some reading on the linux-media list it seems this driver doesn't play nicely with busy interrupts and with three tuner cards and six disks this machine is busy.
>

I would be surprised if one DVB card had more or less glitches than another.
Glitches on DVB are more likely cause by bad reception so receiver
sensitivity and worse S/N ratio would be the most likely causes.
DVB satellites move around the sky in a figure of 8 shape, so
depending on where your dish is pointing, the signal signal strength
might vary over time.
Was the S/N ratio the same on both cards?
It might be that the hard disks are causing the problem or the filesystem.
Which file system are you using?
I know rieserfs is particularly bad for low latency application.

James



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