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RE: Bah! How do I change channels?




Hi,

Am Samstag, den 27.06.2009, 22:36 -0400 schrieb George Adams:
> A final wrapup (and again, thanks all of you - I'm indebted to you for your help):
>  
> after booting:
>  
> > v4l2-ctl -F
> Frequency: 9076 (567.250000 MHz)
>  
> > ivtv-tune -c 3
> /dev/video0: 61.250 MHz
> > v4l2-ctl -F
> Frequency: 980 (61.250000 MHz)
>  
> > v4l2-ctl -f 61.25
> Frequency set to 980 (61.250000 MHz)
> > v4l2-ctl -F           
> Frequency: 980 (61.250000 MHz)
>  
> > v4lctl setchannel 3
> > v4l2-ctl -F      
> Frequency: 0 (0.000000 MHz)
>  
> Conclusion: I'll stick with ivtv-tune or v4l2-ctl and ignore the misbehaving v4lctl
>  
> Hermann: Thanks, but I think you're mistaking the v4lctl "setstation" command (which relies on .xawtv) and the "setchannel" command (which does not, at least according to the man page.)

I can for sure tell, that, if I rename/remove my .xawtv, "setchannel"
does not work anymore and I see exactly what you reported initially.

That can be looked up in the code and it also should not matter that I
have a dual install of xawtv-3.95 and 4x since both start to exist.

Cheers,
Hermann
 
> 
> 
> ----------------------------------------
> > Subject: RE: Bah! How do I change channels?
> > From: hermann-pitton@xxxxxxxx
> > To: g_adams27@xxxxxxxxxxx
> > CC: dheitmueller@xxxxxxxxxxxxxx; awalls@xxxxxxxxx; video4linux-list@xxxxxxxxxx; linux-media@xxxxxxxxxxxxxxx
> > Date: Sun, 28 Jun 2009 03:39:05 +0200
> >
> > Hi,
> >
> > Am Samstag, den 27.06.2009, 00:25 -0400 schrieb George Adams:
> >> Thanks again to both of you for your help. I gave the no_poweroff flag a try, but didn't see any difference. I also tried a "setchannel 3" during the middle of the encoding session, and also saw no change.
> >
> > hm, I'm late on the party, but for Gerd's v4lctl try to RTFM.
> >
> > The "setchannel" options reads from .xawtv.
> >
> > For me it still works, but issues with tda827x silicon tuners are known
> > walking the ioctls.
> >
> > Cheers,
> > Hermann
> >
> >
> >> But I think I've found the problem:
> >>
> >>> v4lctl setnorm NTSC; v4lctl setfreqtab us-bcast; v4lctl -v 1 setchannel 3
> >> vid-open: trying: v4l2-old...
> >> vid-open: failed: v4l2-old
> >> vid-open: trying: v4l2...
> >> v4l2: open
> >> v4l2: device info:
> >> em28xx 0.1.1 / Pinnacle PCTV HD Pro Stick @ usb-0000:00:1a.7-1
> >> vid-open: ok: v4l2
> >> freq: reading /usr/share/xawtv/Index.map
> >> v4l2: tuner cap:
> >> v4l2: tuner rxs:
> >> v4l2: tuner cur: MONO
> >> cmd: "setchannel" "3"
> >> v4l2: freq: 0.000
> >> v4l2: close
> >>
> >>
> >> What? freq: 0.000 ? After finding the ivtv package and compiling its utils, I confirm it with this:
> >>
> >>> v4l2-ctl -F
> >> Frequency: 0 (0.000000 MHz)
> >>
> >>> ivtv-tune -c 3
> >> /dev/video0: 61.250 MHz
> >>
> >>> v4l2-ctl -F
> >> Frequency: 980 (61.250000 MHz)
> >>
> >>> v4lctl setchannel 3
> >>
> >>> v4l2-ctl -F
> >> Frequency: 0 (0.000000 MHz)
> >>
> >>
> >> So mysteriously, it seems like v4lctl is just plain not working. And ivtv-tune, on the other hand, is working just fine. After I do that and start Helix Producer, I see channel 3 just like I had hoped.
> >>
> >> (strangely, v4lctl can do other things fine, like change the norm from NTSC to PAL. It just can't change the channel.)
> >>
> >> So, sorry that it went off in rabbit trails of the device powering down and so forth. I wonder what happened to my v4lctl program, though? xawtv itself (running in X) seems to work fine when I tell it to change the channel...
> >>
> >>
> >>
> >>
> >>
> >>
> >>> Date: Fri, 26 Jun 2009 09:42:06 -0400
> >>> Subject: Re: Bah! How do I change channels?
> >>> From: dheitmueller@xxxxxxxxxxxxxx
> >>> To: awalls@xxxxxxxxx
> >>> CC: g_adams27@xxxxxxxxxxx; video4linux-list@xxxxxxxxxx; linux-media@xxxxxxxxxxxxxxx
> >>>
> >>> On Fri, Jun 26, 2009 at 7:50 AM, Andy Walls wrote:
> >>>> I use either v4l2-ctl or ivtv-tune
> >>>>
> >>>> $ ivtv-tune -d /dev/video0 -t us-bcast -c 3
> >>>> /dev/video0: 61.250 MHz
> >>>>
> >>>> $ v4l2-ctl -d /dev/video0 -f 61.250
> >>>> Frequency set to 980 (61.250000 MHz)
> >>>>
> >>>>
> >>>> Regards,
> >>>> Andy
> >>>
> >>> Hello Andy,
> >>>
> >>> I had sent George some email off-list with basically the same
> >>> commands. I think what might be happening here is the tuner gets
> >>> powered down when not in use, so I think it might be powered down
> >>> between the v4l-ctl command and the running of the other application.
> >>>
> >>> I have sent him a series of commands to try where he modprobes the
> >>> xc3028 driver with "no_poweroff=1", and we will see if that starts
> >>> working.
> >>>
> >>> Devin
> >>>
> >>> --
> >>> Devin J. Heitmueller - Kernel Labs
> >>> http://www.kernellabs.com


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