[mythtvnz] Trying to troubleshoot DVB-T artifacts

[Guy Gibson]

Steve Im getting a similar output from dvbtune to you and what Jean- 
Francois  have shown.  My signal strength hovers around 38000-39000 on  
all 3 multiplexes.  TV3 (1080i) is now pretty solid and C4(same  
multiplex) is much better.  720p content on the TVNZ multiplex does  
suffer from at times severe pixilation(blockiness) in times of fast  
pans etc.  Also seeing some on TVNZ 7 as well which is the TVNZ  
multiplex but 576I I believe.

Guy


On 26/04/2009, at 8:08 PM, Steve V wrote:

>
>
> From: Jean-Francois Pirus <jfp at clearfield.com>
> To: MythTV in NZ <mythtvnz at lists.linuxnut.co.nz>
> Sent: Sunday, 26 April, 2009 12:53:35 PM
> Subject: Re: [mythtvnz] Trying to troubleshoot DVB-T artifacts
>
>
> I think the SNR is useless if you dont' have an "S" (aka  
> FE_HAS_SIGNAL)
>
> On my Nova-T 500 this is what I get
>
> dvbtune -c 2 - 530000000 -m
> Signal=22375, Verror=2097151, SNR=0dB, BlockErrors=0, (C|V|SY|)
> Signal=32857, Verror=0, SNR=0dB, BlockErrors=213, (S|L|C|V|SY|)
> Signal=32792, Verror=0, SNR=0dB, BlockErrors=0, (S|L|C|V|SY|)
> Signal=32817, Verror=0, SNR=0dB, BlockErrors=0, (S|L|C|V|SY|)
> Signal=32771, Verror=0, SNR=0dB, BlockErrors=0, (S|L|C|V|SY|)
> Signal=32847, Verror=0, SNR=0dB, BlockErrors=0, (S|L|C|V|SY|)
> Signal=32838, Verror=0, SNR=0dB, BlockErrors=0, (S|L|C|V|SY|)
> Signal=32797, Verror=0, SNR=0dB, BlockErrors=0, (S|L|C|V|SY|)
> Signal=32801, Verror=0, SNR=0dB, BlockErrors=0, (S|L|C|V|SY|)
>
> My reading of the values on the Nova-T 500 is
> Signal is 0-65535 (Where 65535 is 100%/perfect)
> SNR is 0-65535 ( Where 0 is perfect and 65535 is crap)
>
>
> Hi Jean-Francois,
>
> From your printout above I see that you have lower strength than I  
> do but aIl other parameters the same.
>
> Do you get any blockiness in your pictures when there is fast motion  
> on the screen? For me this happens for some scenes in just about  
> every broadcast on TV One but not so much on TV3.?
>
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