[mythtv-users] Two tuners showed up

[Stephen Atkins]

On 8/5/2011 5:30 PM, Robert McNamara wrote:
> On Fri, Aug 5, 2011 at 4:25 PM, Stephen Atkins<satkins at inetdesign.org>  wrote:
>> On 8/5/2011 5:24 PM, Nick Morrott wrote:
>>> On 6 August 2011 00:19, Stephen Atkins<satkins at inetdesign.org>    wrote:
>>>> I rebuilt my master backend.  Once the DB was restored from the original
>>>> I deleted all capture cards (both local and on remote backends) since I
>>>> switched cards to different versions.
>>>>
>>>> When I created the HVR-1600 which is on the master, it seems to have
>>>> created two instances of it.  So cardid 17 and cardid 18 both point to
>>>> the same device.  But when I manage the cards in the mythtv-setup it
>>>> only shows one.  If I change something (like time to wait for a signal)
>>>> it changes both of them in the database.  In MythWeb it shows both of
>>>> them.  I'm just wondering what might happen if I manually delete #18?
>>>> Is there any other tables that might need cleaning up after this?
>>>
>>> Sounds like the expected behaviour when you have configured a digital
>>> tuner with multirec set for 2 (the default if you don't explicitly
>>> change the setting) concurrent recordings. Nothing to worry about.
>>>
>>> Both "virtual" tuners share the same physical tuner, hence the reason
>>> why changing tuning parameters affects all entries associated with the
>>> physical tuner.
>>>
>>
>> Thanks for the quick response.  That's what it is.  Just need to turn
>> off that second virtual card as the 1600 can't do two digital's at once.
>
> You misunderstand.  Multirec means it can record multiple channels
> from a single multiplex with a single digital tuner.  You don't want
> to turn off the virtual tuners.  It might not do you a heck of a lot
> of good depending on how the cable or broadcast is engineered where
> you are, but it at least allows Myth's scheduler to record multiple
> things at once with *just* the one digital tuner of the card if
> multiple things you want to record happen to be on the same multiplex
> at the same time.

I'm sure I understand what he's getting at.  Some tuner cards can record 
multiple channels even from only one tuner.  I can't think of any cards 
that do this off the top of my head but I'm 99% (from all the docs I've 
read) that the HVR-1600 can't.  It does have an Analog and Digital tuner 
in it.  Those can be used at the same time but you can't do two digital 
or two analog at the same time.  So with that I should set the digital 
to only 1.

Now if I'm wrong about this card let me know.  I'm only going by what 
I've read and understand from the wiki pages (both mythtv and linuxtv 
wiki's).

-- 
Stephen Atkins
VE6CPU/VE6CIC