Tuner Problems with Xawtv (but not fxtv)

Josh Elsasser jre at vineyard.net
Wed Apr 21 22:04:13 PDT 2004

On Thu, Apr 22, 2004 at 01:38:06AM +0200, Levi Masterson wrote:
> > 
> > I have the same problem with xawtv/motv and mplayer.  What is odd is
> > that these programs are setting the correct frequency, I have verified
> > this with fxtv, but the card still appears to not be tuning it
> > correctly.
> > 
> > I have a quick workaround, but I want to investigate a little more and
> > find out what the real problem is before I start submitting patches.
> > 
> >  -jre
> > 
> It looks to me like fxtv relies on the tuner's (or drivers') knowledge of
> what acceptable channels are for the given locale, while xawtv/motv uses the
> aforementioned frequency lists.
> I'd have no problem using fxtv if I could figure out how to turn that ugly
> toolbar off, or get dtv to work (i.e. change channels).
> --Levi

Yes, both xawtx/motv and mplayer use frequencies directly, but that
should still work if the frequencies are correct.  I've tracked the
problem down to an actual bug in the bktr driver where a frequency
offset was taken from the current channel set.  If the program doesn't
use channels, then the wrong offset may be used.

I've worked around this by having xawtx/motv and mplayer choose a NTSC
or PAL channel set.  I also have a fix for the driver itself, but I
haven't tested it yet.

Try out this patch for xawtv/motv and tell me how it works for you:


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