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Questions about Closed Captioning, ivtv, and mythtv

 

 

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ivtv at archer-segel

Jul 27, 2005, 8:01 PM

Post #1 of 6 (932 views)
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Questions about Closed Captioning, ivtv, and mythtv

I'm confused about how things work (or don't work) on my MythTV system,
and I have a few questions. Sorry if I have some of the terminology
wrong - this is all new territory for me:

1. What does the wss option do? I can set it with ivtvctl, but when I
check the current setting it seems to not be set (see output below). Do
I even need it for standard 4:3 NTSC broadcasts?

# ivtvctl -b wss
ioctl IVTV_IOC_S_VBI_MODE ok
vbi service_set set to 00000008
# ivtvctl -B
ioctl IVTV_IOC_G_VBI_MODE ok
vbi service_set = 00000000

Is this a problem?

2. Is 'passthrough mode' only useful if I'm watching live TV and want to
use the TVs built-in CC decoder? If I'm watching a recording in MythTV,
does 'passthrough mode' even matter? Which decoder should I use for a
recording (TV or MythTV)? Or does that depend on whether I'm using the
PVR-350 decoder for video or the built-in MythTV drivers?

I can only get CC working with live TV using the TVs own decoder. With
recordings it's scrambled and unusable via the TVs decoder, and I never
get anything at all via MythTVs CC support..

I'm using ivtv 0.3.7 and MythTV 0.18.1-r2.

Thanks for any light anybody can shed on this.

Daniel


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zoiks2004-ivtv at yahoo

Jul 27, 2005, 11:14 PM

Post #2 of 6 (921 views)
Permalink
Re: Questions about Closed Captioning, ivtv, and mythtv [In reply to]

I second that. Could someone explain this stuff to us
mere mortals? I've been trying for weeks to get this
working and I get nothing.

Daniel - how did you get passthrough working? I still
can't even get that to work.

--- Daniel Segel <ivtv [at] archer-segel> wrote:

> I'm confused about how things work (or don't work)
> on my MythTV system,
> and I have a few questions. Sorry if I have some of
> the terminology
> wrong - this is all new territory for me:
>
> 1. What does the wss option do? I can set it with
> ivtvctl, but when I
> check the current setting it seems to not be set
> (see output below). Do
> I even need it for standard 4:3 NTSC broadcasts?
>
> # ivtvctl -b wss
> ioctl IVTV_IOC_S_VBI_MODE ok
> vbi service_set set to 00000008
> # ivtvctl -B
> ioctl IVTV_IOC_G_VBI_MODE ok
> vbi service_set = 00000000
>
> Is this a problem?
>
> 2. Is 'passthrough mode' only useful if I'm watching
> live TV and want to
> use the TVs built-in CC decoder? If I'm watching a
> recording in MythTV,
> does 'passthrough mode' even matter? Which decoder
> should I use for a
> recording (TV or MythTV)? Or does that depend on
> whether I'm using the
> PVR-350 decoder for video or the built-in MythTV
> drivers?
>
> I can only get CC working with live TV using the TVs
> own decoder. With
> recordings it's scrambled and unusable via the TVs
> decoder, and I never
> get anything at all via MythTVs CC support..
>
> I'm using ivtv 0.3.7 and MythTV 0.18.1-r2.
>
> Thanks for any light anybody can shed on this.
>
> Daniel
>
>
>
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> 19-22, 2005 * San Francisco, CA * Development
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> http://www.sqe.com/bsce5sf
> _______________________________________________
> ivtv-devel mailing list
> ivtv-devel [at] lists
>
https://lists.sourceforge.net/lists/listinfo/ivtv-devel
>



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19-22, 2005 * San Francisco, CA * Development Lifecycle Practices
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ivtv at archer-segel

Jul 28, 2005, 4:55 PM

Post #3 of 6 (905 views)
Permalink
Re: Questions about Closed Captioning, ivtv, and mythtv [In reply to]

The solution for me was to set the ivtv options much later in the boot
process, well after the ivtv module itself was loaded and after I
initialized it with dd. On my Gentoo system I put the ivtvctl command in
my /etc/conf.d/local.start file, and that makes CC work for both live TV
and in recordings. However, the previously reported bug that makes CC
stop after you jump forward in the recorded program seems to be there
for me as well.

The end of my local.start file contains:
echo "Initializing MPEG decoder..."
/bin/dd if=/dev/video0 of=/dev/video16 bs=65k count=25
echo "Resetting VBI options..."
/usr/local/bin/ivtvctl -x 1 -w cc -b cc

This is run right at the end of the boot process, just before it
switches to runlevel 5.

Daniel

zoiks2004-ivtv [at] yahoo wrote:

>I second that. Could someone explain this stuff to us
>mere mortals? I've been trying for weeks to get this
>working and I get nothing.
>
>Daniel - how did you get passthrough working? I still
>can't even get that to work.
>
>--- Daniel Segel <ivtv [at] archer-segel> wrote:
>
>
>
>>I'm confused about how things work (or don't work)
>>on my MythTV system,
>>and I have a few questions. Sorry if I have some of
>>the terminology
>>wrong - this is all new territory for me:
>>
>>1. What does the wss option do? I can set it with
>>ivtvctl, but when I
>>check the current setting it seems to not be set
>>(see output below). Do
>>I even need it for standard 4:3 NTSC broadcasts?
>>
>># ivtvctl -b wss
>>ioctl IVTV_IOC_S_VBI_MODE ok
>>vbi service_set set to 00000008
>># ivtvctl -B
>>ioctl IVTV_IOC_G_VBI_MODE ok
>>vbi service_set = 00000000
>>
>>Is this a problem?
>>
>>2. Is 'passthrough mode' only useful if I'm watching
>>live TV and want to
>>use the TVs built-in CC decoder? If I'm watching a
>>recording in MythTV,
>>does 'passthrough mode' even matter? Which decoder
>>should I use for a
>>recording (TV or MythTV)? Or does that depend on
>>whether I'm using the
>>PVR-350 decoder for video or the built-in MythTV
>>drivers?
>>
>>I can only get CC working with live TV using the TVs
>>own decoder. With
>>recordings it's scrambled and unusable via the TVs
>>decoder, and I never
>>get anything at all via MythTVs CC support..
>>
>>I'm using ivtv 0.3.7 and MythTV 0.18.1-r2.
>>
>>Thanks for any light anybody can shed on this.
>>
>>Daniel
>>
>>
>>
>>
>>
>-------------------------------------------------------
>
>
>>SF.Net email is Sponsored by the Better Software
>>Conference & EXPO September
>>19-22, 2005 * San Francisco, CA * Development
>>Lifecycle Practices
>>Agile & Plan-Driven Development * Managing Projects
>>& Teams * Testing & QA
>>Security * Process Improvement & Measurement *
>>http://www.sqe.com/bsce5sf
>>_______________________________________________
>>ivtv-devel mailing list
>>ivtv-devel [at] lists
>>
>>
>>
>https://lists.sourceforge.net/lists/listinfo/ivtv-devel
>
>
>
>
>
>-------------------------------------------------------
>SF.Net email is Sponsored by the Better Software Conference & EXPO September
>19-22, 2005 * San Francisco, CA * Development Lifecycle Practices
>Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA
>Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf
>_______________________________________________
>ivtv-devel mailing list
>ivtv-devel [at] lists
>https://lists.sourceforge.net/lists/listinfo/ivtv-devel
>
>



-------------------------------------------------------
SF.Net email is Sponsored by the Better Software Conference & EXPO September
19-22, 2005 * San Francisco, CA * Development Lifecycle Practices
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Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf
_______________________________________________
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https://lists.sourceforge.net/lists/listinfo/ivtv-devel


ssukovich at tampabay

Jul 28, 2005, 6:17 PM

Post #4 of 6 (913 views)
Permalink
Re: Questions about Closed Captioning, ivtv, and mythtv [In reply to]

> The end of my local.start file contains:
> echo "Initializing MPEG decoder..."
> /bin/dd if=/dev/video0 of=/dev/video16 bs=65k count=25
> echo "Resetting VBI options..."
> /usr/local/bin/ivtvctl -x 1 -w cc -b cc


this is almost exactly what i did to get the captioning to work
on live tv and on recordings. i had found the whole post-install
method in the ivtv file in /etc/modules.d/ didnt work for some
reason. i dont have the dd of video0 to 16 though. is that
necessary? mine seems to work fine except for my problem
with the captions turning off while skipping ahead.

i think ill have to take a crack at the code and see if i can get it
working. it just seems that when you stop the mpeg stream it turns
off the captioning, and forgets to turn it back on when the stream
starts back up. ehh *shrug*

stephen


-------------------------------------------------------
SF.Net email is Sponsored by the Better Software Conference & EXPO September
19-22, 2005 * San Francisco, CA * Development Lifecycle Practices
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Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf
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tatrafford at comcast

Jul 28, 2005, 7:00 PM

Post #5 of 6 (905 views)
Permalink
Re: Questions about Closed Captioning, ivtv, and mythtv [In reply to]

On Thu, Jul 28, 2005 at 09:17:57PM -0400, sukovich wrote:
>
> >The end of my local.start file contains:
> >echo "Initializing MPEG decoder..."
> >/bin/dd if=/dev/video0 of=/dev/video16 bs=65k count=25
> >echo "Resetting VBI options..."
> >/usr/local/bin/ivtvctl -x 1 -w cc -b cc
>
>
> this is almost exactly what i did to get the captioning to work
> on live tv and on recordings. i had found the whole post-install
> method in the ivtv file in /etc/modules.d/ didnt work for some
> reason. i dont have the dd of video0 to 16 though. is that
> necessary? mine seems to work fine except for my problem
> with the captions turning off while skipping ahead.
>
> i think ill have to take a crack at the code and see if i can get it
> working. it just seems that when you stop the mpeg stream it turns
> off the captioning, and forgets to turn it back on when the stream
> starts back up. ehh *shrug*

This may be happening in MythTV.
--
Tyler Trafford

Perilous to all of us are the devices of an art deeper than we ourselves
possess.
-- Gandalf the Grey [J.R.R. Tolkien, "Lord of the Rings"]


-------------------------------------------------------
SF.Net email is Sponsored by the Better Software Conference & EXPO September
19-22, 2005 * San Francisco, CA * Development Lifecycle Practices
Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA
Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf
_______________________________________________
ivtv-devel mailing list
ivtv-devel [at] lists
https://lists.sourceforge.net/lists/listinfo/ivtv-devel


zoiks2004-ivtv at yahoo

Jul 28, 2005, 9:23 PM

Post #6 of 6 (877 views)
Permalink
Re: Questions about Closed Captioning, ivtv, and mythtv [In reply to]

OK so it seems there isn't much of a production
solution to CC on Myth using ivtv. That's cool, at
least now I know. ;)


--- Tyler Trafford <tatrafford [at] comcast> wrote:

> On Thu, Jul 28, 2005 at 09:17:57PM -0400, sukovich
> wrote:
> >
> > >The end of my local.start file contains:
> > >echo "Initializing MPEG decoder..."
> > >/bin/dd if=/dev/video0 of=/dev/video16 bs=65k
> count=25
> > >echo "Resetting VBI options..."
> > >/usr/local/bin/ivtvctl -x 1 -w cc -b cc
> >
> >
> > this is almost exactly what i did to get the
> captioning to work
> > on live tv and on recordings. i had found the
> whole post-install
> > method in the ivtv file in /etc/modules.d/ didnt
> work for some
> > reason. i dont have the dd of video0 to 16 though.
> is that
> > necessary? mine seems to work fine except for my
> problem
> > with the captions turning off while skipping
> ahead.
> >
> > i think ill have to take a crack at the code and
> see if i can get it
> > working. it just seems that when you stop the mpeg
> stream it turns
> > off the captioning, and forgets to turn it back on
> when the stream
> > starts back up. ehh *shrug*
>
> This may be happening in MythTV.
> --
> Tyler Trafford
>
> Perilous to all of us are the devices of an art
> deeper than we ourselves
> possess.
> -- Gandalf the Grey [J.R.R. Tolkien, "Lord of the
> Rings"]
>
>
>
-------------------------------------------------------
> SF.Net email is Sponsored by the Better Software
> Conference & EXPO September
> 19-22, 2005 * San Francisco, CA * Development
> Lifecycle Practices
> Agile & Plan-Driven Development * Managing Projects
> & Teams * Testing & QA
> Security * Process Improvement & Measurement *
> http://www.sqe.com/bsce5sf
> _______________________________________________
> ivtv-devel mailing list
> ivtv-devel [at] lists
>
https://lists.sourceforge.net/lists/listinfo/ivtv-devel
>



-------------------------------------------------------
SF.Net email is Sponsored by the Better Software Conference & EXPO September
19-22, 2005 * San Francisco, CA * Development Lifecycle Practices
Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA
Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf
_______________________________________________
ivtv-devel mailing list
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https://lists.sourceforge.net/lists/listinfo/ivtv-devel

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