[mythtv-users] three questions with DVB-T

Matt Harrison iwasinnamuknow at genestate.com
Tue Apr 5 23:15:10 UTC 2011

On 05/04/2011 21:03, Matt Harrison wrote:
> On 05/04/2011 12:46, Ian Barton wrote:
>> On 05/04/11 01:39, Matt Harrison wrote:
>>> 1) Sometimes after not running live tv or recording for a while (seems
>>> pretty random), I cannot get a lock on any channel. A mixture of
>>> reboots, rescans (or just doing something else for an afternoon) _might_
>>> fix it, or might not. If I do run a rescan, the signal strength will be
>>> good and channels will be detected, I just wont be able to lock them.
>> Some cards load their firmware from the computer. If you do a warm boot,
>> the card firmware may not be properly re-initialized. It's worth taking
>> out the mains lead for 30 seconds or so, which should force the card's
>> firmware to be reloaded from disk.

Firstly, thanks for all the replies folks, to reply to my last mail:

> Well I've done some more fiddling and it seems that this is indeed the
> case. While my tuners may be supported and compatible, they are somewhat
> flakey. Occasionally it seems I am just going to have to power down and
> unplug for a while, either that or buy new tuners. I can live with it,
> it's not a big problem for me.
> The main problem right now is the guide data (EIT?). I've tried
> everything to get it to correct itself but I am stumped. The guide data
> for some channels is just blank. Some channels are using the guide data
> from completely unrelated channels and some just seem to be making it up.
> I've retuned several times, fiddled with every setting and I'm still
> stuck with it. It's almost unusable like this. I would try nuking the
> database but I'm not used to mythbuntu and don't want to fiddle with the
> mysql install on it.

Ok, scratch that. Reading some previous posts to this list I have 
discovered the wonderous joy that is the Radio Times XMLTV grabber. I 
was under the impression that XMLTV data was a pay service (and probably 
only available in the US). Now I have perfect data for all my channels.

I just really, really wish that I had better tuners. Cold booting the 
machine is ok once in a while, but I've just tried to use all 4 tuners 
again. Three are fine (2 on one device and 1 on the other), but the 
fourth is "No Lock"ing me again.

I can't cold boot the machine every time I want to use all my tuners. I 
believe it's the hardware rather than the drivers. When I first started 
using mythtv I only had the MSI Digivox and I had very few problems. 
This Kworld thing is built on the same chipset but seems to be the root 
of the problem. Unfortunately I can't find another MSI tuner anywhere.

Not sure where to go from here, looks like I'm just gonna be stuck with 
semi-functional hardware...unless anyone has any more ideas ;)


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