Mailing List Archive: MythTV: Users

Signal Strength OSD

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abrown at spsu

Jan 5, 2010, 8:26 AM

Post #1 of 7 (1045 views)
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Signal Strength OSD

Hi all,

Have a quick question. I've recently upgraded to mythtv 0.22, love it,
but one problem. When first entering live tv from the "Watch TV" menu,
the OSD shows the signal strength from my OTA HDTV Antenna. When
selecting another channel (while in live tv mode) the signal strength
meter always displays 0%, even though the channel comes in perfectly
clear. In 0.21 all channels showed a signal. Is this a bug in the 0.22
OSD?

--
Adam
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bkamen at benjammin

Jan 5, 2010, 8:30 AM

Post #2 of 7 (1013 views)
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Re: Signal Strength OSD [In reply to]

On 1/5/2010 10:26 AM, Adam Brown wrote:
> Hi all,
>
> Have a quick question. I've recently upgraded to mythtv 0.22, love it,
> but one problem. When first entering live tv from the "Watch TV" menu,
> the OSD shows the signal strength from my OTA HDTV Antenna. When
> selecting another channel (while in live tv mode) the signal strength
> meter always displays 0%, even though the channel comes in perfectly
> clear. In 0.21 all channels showed a signal. Is this a bug in the 0.22
> OSD?
>

This works fine for me. Every time I switch channels, it waits for the lock and I see the sequence.

I'm not saying you're insane, (heheh) I'm just saying even with my wonky system that it's working.

-Ben

--
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======================================================================
Email: bkamen AT benjammin DOT net Web: http://www.benjammin.net
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dheitmueller at kernellabs

Jan 5, 2010, 8:32 AM

Post #3 of 7 (1010 views)
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Re: Signal Strength OSD [In reply to]

On Tue, Jan 5, 2010 at 11:26 AM, Adam Brown <abrown [at] spsu> wrote:
> Hi all,
>
> Have a quick question. I've recently upgraded to mythtv 0.22, love it,
> but one problem. When first entering live tv from the "Watch TV" menu,
> the OSD shows the signal strength from my OTA HDTV Antenna. When
> selecting another channel (while in live tv mode) the signal strength
> meter always displays 0%, even though the channel comes in perfectly
> clear. In 0.21 all channels showed a signal. Is this a bug in the 0.22
> OSD?

It's not actually a bug - it's a lack of standardization of the units
in which different tuner drivers report Strength/SNR information
(hence applications do not know how to report the info since it
differs with every tuner). The way MythTV shows the info is
appropriate for a particular model of tuner, presumably because
whoever wrote the code did what worked for whatever model of tuner
he/she happened to have.

You can search the linux-media mailing list archives for more on the
topic (as it's been discussed at length).

Devin

--
Devin J. Heitmueller - Kernel Labs
http://www.kernellabs.com
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brent.bolin at gmail

Jan 5, 2010, 8:34 AM

Post #4 of 7 (1007 views)
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Re: Signal Strength OSD [In reply to]

On Tue, Jan 5, 2010 at 10:26 AM, Adam Brown <abrown [at] spsu> wrote:
> Hi all,
>
> Have a quick question. I've recently upgraded to mythtv 0.22, love it,
> but one problem. When first entering live tv from the "Watch TV" menu,
> the OSD shows the signal strength from my OTA HDTV Antenna. When
> selecting another channel (while in live tv mode) the signal strength
> meter always displays 0%, even though the channel comes in perfectly
> clear. In 0.21 all channels showed a signal. Is this a bug in the 0.22
> OSD?
>
> --
> Adam
> _______________________________________________
> mythtv-users mailing list
> mythtv-users [at] mythtv
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>

Think it might be dependent on the tuner card

I have (2) pcHDTV 5500 where the signal meter works fine
I have a Dvico FusionHDTV(2 tuners in 1) where the signal meter doesn't work
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dheitmueller at kernellabs

Jan 5, 2010, 8:42 AM

Post #5 of 7 (1007 views)
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Re: Signal Strength OSD [In reply to]

On Tue, Jan 5, 2010 at 11:34 AM, Brent Bolin <brent.bolin [at] gmail> wrote:
> Think it might be dependent on the tuner card
>
> I have (2) pcHDTV 5500 where the signal meter works fine
> I have a Dvico FusionHDTV(2 tuners in 1) where the signal meter doesn't work

Yes, it is dictated by the tuner. The Dvico cards use the s5h1411,
and like most of the newer ATSC/QAM cards they report SNR in 0.1dB
increments, which is not how MythTV renders them.

Devin

--
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http://www.kernellabs.com
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brent.bolin at gmail

Jan 5, 2010, 8:57 AM

Post #6 of 7 (992 views)
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Re: Signal Strength OSD [In reply to]

On Tue, Jan 5, 2010 at 10:42 AM, Devin Heitmueller
<dheitmueller [at] kernellabs> wrote:
> On Tue, Jan 5, 2010 at 11:34 AM, Brent Bolin <brent.bolin [at] gmail> wrote:
>> Think it might be dependent on the tuner card
>>
>> I have (2) pcHDTV 5500 where the signal meter works fine
>> I have a Dvico FusionHDTV(2 tuners in 1) where the signal meter doesn't work
>
> Yes, it is dictated by the tuner. �The Dvico cards use the s5h1411,
> and like most of the newer ATSC/QAM cards they report SNR in 0.1dB
> increments, which is not how MythTV renders them.
>
> Devin
>
> --
> Devin J. Heitmueller - Kernel Labs
> http://www.kernellabs.com
> _______________________________________________
> mythtv-users mailing list
> mythtv-users [at] mythtv
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>

Is there a fix for this in the US ?
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dheitmueller at kernellabs

Jan 5, 2010, 9:12 AM

Post #7 of 7 (1010 views)
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Re: Signal Strength OSD [In reply to]

On Tue, Jan 5, 2010 at 11:57 AM, Brent Bolin <brent.bolin [at] gmail> wrote:
> Is there a fix for this in the US ?

There is no easy "fix". Neither MythTV nor the driver is at fault,
given the specification for the format of the information is
undefined.

This was discussed at length on the linux-media mailing list (and I
suggest you review the archives for the full debate). Unless the
specification is clarified to specify a particular unit of measure
(and then *every* driver modified to match the specification), or the
API is changed to provide a way to tell the application what the unit
of measure is (and then every driver is modified to report what
measure they are using), the situation will remain unchanged for the
foreseeable future.

Devin

--
Devin J. Heitmueller - Kernel Labs
http://www.kernellabs.com
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