[mythtv-users] Fine Tuning Question
Jeff Waters
jeffwaters at wowway.com
Thu Jun 5 18:07:48 EDT 2003
On Thu, 2003-05-29 at 17:03, Ray Olszewski wrote:
> At 04:40 PM 5/29/2003 -0400, Jeff Waters wrote:
> [...]
> >Hmmm I'm going to sound really dumb here,.. but where do you specify
> >your tuner type? (I've no clue what the tv wonder uses) And... where do
> >I use bttv?
>
> bttv is a kernel module that provides the interface to many v4l
> (video4linux) vidcap cards ... the ones that use the bt848 or bt878 chips.
> If you run "lsmod", it should show that bttv is running. You'll also see an
> i2c module (I forget the excact identifier) and a tuner module (which
> handles channel changing).
>
> I don't use Mandrake myself, so I'm not certain where you specify module
> options. The usual place is /etc/modules.conf . bttv autoprobes cards and
> tries to figure out the card type and the tuner type on its own. In your
> case, it *may* be guessing the wrong tuner type (possibly guessing type 2
> when you have type 17, but here I'm really going out on a limb, based not
> on personal knowledge but imperfect memory of other messages I've seen here).
>
> Anyway, to see what you have, check the dmesg buffer right after you
> boot/init the system (use the command "dmesg" to do this), or see if
> Mandrake, like may distros, copies the initial contents of this buffer to a
> file in /var/log . Either way, look for lines with "bttv" in the to see
> what you are getting.
>
> There is no man page for bttv, since it is a kernel module. Look in the
> kernel documentation (that comes with kernel source) for a bttv
> subdirectory, to see the docs for this module.
>
> Before xawtv started scanning for channels, you had to tell it what
> frequency set to use. Some USA cable operators use us-cable, others
> us-cable-hrc, and there's no way to know unless they tell you (or you try
> both and then use the one that works better). The two frequency sets are
> somewhat similar, so if you guessed wrong, you might be seeing what you
> describe.
>
> So ... to sum it up ... your problem still may be wrong tuner type or wrong
> frequency set. You haven't told us enough to tell. But with this additional
> information, you may be able to track down the needed details.
>
> >To be honest I bought the card, slapped it in and Mandrake said hey
> >there is a new card and I started up xawtv and it scanned for channels
> >and I was up and working... of course all the channels were off by 1 and
> >fuzzy so I messed around with it till I figured out it was +111 off in
> >the fine tuning. So I've been adjusting it like that since I bought it a
> >year ago. I've used (here in Ohio) Time Warner and now Wide Open West
> >cable.
> >I have never messed with Bttv... although from your response it seems I
> >should have.
> >I guess I need to read the man page on bttv then.
>
>
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>
Ray, Thanks bro! That helped with the tuner. Your a lifesaver man.
Now to get the hardware audio to capture and save some of my processor
for the rest of my apps.
-Jeff
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