[mythtv-users] No closed captioning for any tuner in Mythtv SVN

[Sam Logen]

OK, This'll take a while, but I'll get back with the
results when I am done experimenting.

Sam

--- Daniel Kristjansson <danielk at cuymedia.net> wrote:

> On Wed, 2007-11-14 at 17:00 -0800, Sam Logen wrote:
> > Thank you Daniel and Craig for getting back to me
> on
> > this.  On my first email today, I included my
> hardware
> > details at the bottom of my email.  As for my
> settings
> > in the mythtv-setup program, the VBI is set to
> NTSC
> > closed captions for my area (California).  Just to
> > clarify, only my ATSC card used to be able to
> display
> > VBI closed captioning for HD channels when I ran
> > Mythtv 20.2.  After upgrading to SVN, neither card
> > could display CC.  It seems that Mythtv took one
> step
> > forward, and two steps back in its development.
> > 
> > The drivers I am using for the cards are the very
> > latest Conexant 2388x drivers, including the
> latest
> > blackbird driver patches for the hardware mpeg
> card.
> 
> Hmm, did you upgrade the drivers when you upgraded
> to SVN?
> 
> If so this is a possible culprit. I've never gotten
> captions
> with the Conexant 2388x drivers, so I can't tell you
> this will
> work, but the fact that you had it working is
> promising.
> 
> What you probably want to do is first make sure that
> the drivers
> are working. Do this by reverting to 0.20-fixes and
> seeing the
> captions. If the drivers aren't working, the dvb-v4l
> mailing list
> is the next stop. But assuming this is a MythTV
> issue, it's
> probably something happening in
> libs/libmythtv/channel.cpp
> This URL will give you a revision log of the file:
>
http://svn.mythtv.org/trac/log/trunk/mythtv/libs/libmythtv/channel.cpp?rev=14762
> 
> There have only been 5 changes to that file in that
> time.
> My suggestion would be to test them in this order:
>   12618 -- makes sure it was working a year ago, if
> it
>            wasn't you'll need to start earlier like
> 9524
> if 12618 works try 14444 next
>   if 14444 works try 14592
>      if 14592 works try 14762
>         if 14762 doesn't work it's the probable
> culprit
>      if 14592 doesn't work it's the probable culprit
>   if 14444 doesn't work try 12739
>      if 12739 works 14444 is the probable culprit
>      if 12739 doesn't work try 12619
>         if 12619 works 12739 is the probable culprit
>         if 12619 doesn't work it's the probable
> culprit
> 
> This way of bisecting the change sets means you only
> need
> to check 1 + ceil(log2 n) of the changes. In this
> case 4,
> which is almost as bad as the 6 you would need to
> check
> otherwise; but if 12618 doesn't work and you have to
> check
> the 20 changes back to 9204, it means you only need
> to
> check 6 revisions rather than 20.
> 
> Anyway to check out an old version of MythTV you
> just do
> this: svn co -r REV
> http://svn.mythtv.org/svn/trunk/mythtv mythtv-REV
> replacing REV with the revision you want.
> 
> PS Before doing this make sure you have your V4L
> format set to
> "NTSC" and not "ATSC". MythTV used to be more
> forgiving of this
> configuration mistake back in the day. But DTV
> support in the V4L
> drivers has been completely dropped from the V4L
> drivers since
> the V4L-DVB merger and we no longer have that code
> in SVN as of
> about two months ago.
> 
> -- Daniel
> 
> _______________________________________________
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> mythtv-users at mythtv.org
>
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> 



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