[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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