Mailing List Archive: MythTV: Users

Two HVR-950Q tuners

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satkins at inetdesign

Apr 2, 2011, 5:30 AM

Post #1 of 10 (984 views)
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Two HVR-950Q tuners

Hello all. I recently as able to get my hands on a second HVR-950Q.
I've heard that there could be issues with having two of these on the
same back end. Can some one confirm or deny this? Just want to make
sure my wife's soaps get recorded and I'm not out in the dog house.

Thanks

Stephen
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mythtv at rtr

Apr 3, 2011, 3:46 PM

Post #2 of 10 (935 views)
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Re: Two HVR-950Q tuners [In reply to]

On 11-04-02 08:30 AM, Stephen Atkins wrote:
> Hello all. I recently as able to get my hands on a second HVR-950Q.
> I've heard that there could be issues with having two of these on the
> same back end. Can some one confirm or deny this? Just want to make
> sure my wife's soaps get recorded and I'm not out in the dog house.

So long as both of them are connected to the exact same cableTV service
or OTA antenna, no issues.

But if they are hooked to different sources, then you'll have to do
some system tweaking to ensure they always end up with the same DVB numbering
from boot to boot.

Cheers
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gnassas at mac

Apr 3, 2011, 4:33 PM

Post #3 of 10 (934 views)
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Re: Two HVR-950Q tuners [In reply to]

On 2011-04-03, at 6:46 PM, Mark Lord wrote:

> But if they are hooked to different sources, then you'll have to do
> some system tweaking to ensure they always end up with the same DVB numbering
> from boot to boot.

Is this tweaking something other than udev rules? I have two different dvb cards and myth ignores the soft links I create through udev.

Sorry if this is a dumb question - I only noticed the problem yesterday and haven't had a chance to read up on what to do about it. If you happen to have the handy solution I'd be grateful!

- George
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mythtv at rtr

Apr 4, 2011, 6:03 AM

Post #4 of 10 (927 views)
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Re: Two HVR-950Q tuners [In reply to]

On 11-04-03 07:33 PM, George Nassas wrote:
> On 2011-04-03, at 6:46 PM, Mark Lord wrote:
>
>> But if they are hooked to different sources, then you'll have to do
>> some system tweaking to ensure they always end up with the same DVB numbering
>> from boot to boot.
>
> Is this tweaking something other than udev rules? I have two different dvb
> cards and myth ignores the soft links I create through udev.
>
> Sorry if this is a dumb question - I only noticed the problem yesterday and
> haven't had a chance to read up on what to do about it. If you happen to have
> the handy solution I'd be grateful!

I never warmed up to udev rules, but they are the best
general solution for this type of issue, if you can
figure them out and get them to work.

The HVR-950Q has a problem, in that it does not have a unique
serial number per device. So plug in multiple ones, and the
only way to distinguish between them in software is to use
the USB bus identifiers.

This is all compounded in mythtv-0.24, because mythtv does NOT
permit the user to enter an arbitrary DVB device string for some reason.
Or at least not with the Mythbuntu theme I'm using.

It allows device name strings for non-DVB tuners, but insists on
forcing use of simple 0/1 style numbering for DVB (DTV) tuners.

Which makes the whole problem extremely difficult for many users.
I had to write a script here to reorder the /dev/dvb/ directory
to get consistent numbering for my DTV tuners.

I might clean it up and post it (or a link to it) if there's sufficient interest.

Cheers
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joshoekstra at gmx

Apr 4, 2011, 6:49 AM

Post #5 of 10 (925 views)
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Re: Two HVR-950Q tuners [In reply to]

Op 4-4-2011 15:03, Mark Lord schreef:
> On 11-04-03 07:33 PM, George Nassas wrote:
>> On 2011-04-03, at 6:46 PM, Mark Lord wrote:
>>
>>> But if they are hooked to different sources, then you'll have to do
>>> some system tweaking to ensure they always end up with the same DVB numbering
>>> from boot to boot.
>> Is this tweaking something other than udev rules? I have two different dvb
>> cards and myth ignores the soft links I create through udev.
>>
>> Sorry if this is a dumb question - I only noticed the problem yesterday and
>> haven't had a chance to read up on what to do about it. If you happen to have
>> the handy solution I'd be grateful!
> I never warmed up to udev rules, but they are the best
> general solution for this type of issue, if you can
> figure them out and get them to work.
>
> The HVR-950Q has a problem, in that it does not have a unique
> serial number per device. So plug in multiple ones, and the
> only way to distinguish between them in software is to use
> the USB bus identifiers.
>
> This is all compounded in mythtv-0.24, because mythtv does NOT
> permit the user to enter an arbitrary DVB device string for some reason.
> Or at least not with the Mythbuntu theme I'm using.
>

Same here, wonder what the logic behind it is. I got 3 DVB-devices here
which seem to change place every 2nd reboot and got udev-rules in place
to order them, however can;t get mythtv to listen.

> It allows device name strings for non-DVB tuners, but insists on
> forcing use of simple 0/1 style numbering for DVB (DTV) tuners.
>
> Which makes the whole problem extremely difficult for many users.
> I had to write a script here to reorder the /dev/dvb/ directory
> to get consistent numbering for my DTV tuners.
>
> I might clean it up and post it (or a link to it) if there's sufficient interest.
>
> Cheers
> _______________________________________________
Yes, please :)

Jos
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mythtv at rtr

Apr 4, 2011, 1:14 PM

Post #6 of 10 (920 views)
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Re: Two HVR-950Q tuners [In reply to]

On 11-04-04 09:49 AM, Jos Hoekstra wrote:
> Op 4-4-2011 15:03, Mark Lord schreef:
..
>> The HVR-950Q has a problem, in that it does not have a unique
>> serial number per device. So plug in multiple ones, and the
>> only way to distinguish between them in software is to use
>> the USB bus identifiers.
>>
>> This is all compounded in mythtv-0.24, because mythtv does NOT
>> permit the user to enter an arbitrary DVB device string for some reason.
>> Or at least not with the Mythbuntu theme I'm using.
>
> Same here, wonder what the logic behind it is. I got 3 DVB-devices here
> which seem to change place every 2nd reboot and got udev-rules in place
> to order them, however can;t get mythtv to listen.
..
>> I had to write a script here to reorder the /dev/dvb/ directory
>> to get consistent numbering for my DTV tuners.

Here's the script I use to force consistent naming
for all v4l (analog) and dvb (digital) tuners in my system.
Except for the hdhomerun tuners, which are fine as-is.

http://rtr.ca/mythtv_patches/rename_tuners.sh

I have added extensive comments at the top of the file to help
moderately experienced users to configure/use the script.

Cheers
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mythtv at rtr

Apr 4, 2011, 1:22 PM

Post #7 of 10 (919 views)
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Re: Two HVR-950Q tuners [In reply to]

On 11-04-04 04:14 PM, Mark Lord wrote:
>
> Here's the script I use to force consistent naming
> for all v4l (analog) and dvb (digital) tuners in my system.
> Except for the hdhomerun tuners, which are fine as-is.
>
> http://rtr.ca/mythtv_patches/rename_tuners.sh
>
> I have added extensive comments at the top of the file to help
> moderately experienced users to configure/use the script.

I've just now updated the script to handle cases where
no tuners are present, so if you just grabbed it before reading
this message, then grab it again now.

Cheers
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kevin at familyross

Apr 4, 2011, 9:00 PM

Post #8 of 10 (910 views)
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Re: Two HVR-950Q tuners [In reply to]

On 4/4/2011 6:03 AM, Mark Lord wrote:
> On 11-04-03 07:33 PM, George Nassas wrote:
>> On 2011-04-03, at 6:46 PM, Mark Lord wrote:
>>
>>> But if they are hooked to different sources, then you'll have to do
>>> some system tweaking to ensure they always end up with the same DVB numbering
>>> from boot to boot.
>> Is this tweaking something other than udev rules? I have two different dvb
>> cards and myth ignores the soft links I create through udev.
>>
>> Sorry if this is a dumb question - I only noticed the problem yesterday and
>> haven't had a chance to read up on what to do about it. If you happen to have
>> the handy solution I'd be grateful!
> I never warmed up to udev rules, but they are the best
> general solution for this type of issue, if you can
> figure them out and get them to work.
>
> The HVR-950Q has a problem, in that it does not have a unique
> serial number per device. So plug in multiple ones, and the
> only way to distinguish between them in software is to use
> the USB bus identifiers.
>
> This is all compounded in mythtv-0.24, because mythtv does NOT
> permit the user to enter an arbitrary DVB device string for some reason.
> Or at least not with the Mythbuntu theme I'm using.
>
> It allows device name strings for non-DVB tuners, but insists on
> forcing use of simple 0/1 style numbering for DVB (DTV) tuners.

Not exactly. It looks for anything named adapter* in the /dev/dvb
directory. So you can name them anything you want, as long as it begins
with "adapter", for example, /dev/dvb/adapter-pinnacle-800i. Symlinks
are fine.

-- Kevin

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gnassas at mac

Apr 5, 2011, 5:06 AM

Post #9 of 10 (912 views)
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Re: Two HVR-950Q tuners [In reply to]

On 2011-04-05, at 12:00 AM, Kevin Ross wrote:

> Not exactly. It looks for anything named adapter* in the /dev/dvb
> directory. So you can name them anything you want, as long as it begins
> with "adapter", for example, /dev/dvb/adapter-pinnacle-800i. Symlinks
> are fine.

Thanks for this tip. It seems obvious now but for whatever reason wasn't before I read it. One correction though - it's a directory that you have to create.

This rule works with my HVR-1600:

SUBSYSTEM=="dvb", ATTRS{vendor}=="0x14f1", ATTRS{device}=="0x5b7a", \
PROGRAM="/bin/sh -c 'K=%k; K=$${K#dvb}; printf dvb/adapter-hvr1600/%%s $${K#*.}'", SYMLINK+="%c"

- George
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mythtv at rtr

Apr 5, 2011, 6:46 AM

Post #10 of 10 (906 views)
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Re: Two HVR-950Q tuners [In reply to]

On 11-04-05 12:00 AM, Kevin Ross wrote:
> On 4/4/2011 6:03 AM, Mark Lord wrote:
>> On 11-04-03 07:33 PM, George Nassas wrote:
>>> On 2011-04-03, at 6:46 PM, Mark Lord wrote:
..
>> It allows device name strings for non-DVB tuners, but insists on
>> forcing use of simple 0/1 style numbering for DVB (DTV) tuners.
>
> Not exactly. It looks for anything named adapter* in the /dev/dvb
> directory. So you can name them anything you want, as long as it begins
> with "adapter", for example, /dev/dvb/adapter-pinnacle-800i. Symlinks
> are fine.

Ah, useful knowledge, thanks.
I'm now updating my rename_tuners.sh script to use that simpler method.

Thanks again!
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