[linux-dvb] choosing default broadcast format

Oliver Endriss o.endriss at gmx.de
Sat Apr 9 13:12:42 CEST 2005


C.Y.M wrote:
> Oliver Endriss wrote:
> > Anssi Hannula wrote:
> > 
> >>Here is a patch which adds tv_standard option to dvb-ttpci.
> >>---
> > 
> > 
> > Recently I found that it can be done without modifying the driver.
> > Try the tool 'v4lctl' (part of the xawtv package):
> > 
> >   v4lctl setnorm ntsc
> > 
> > will switch the card to NTSC mode.
> > 
> > Anyway, we could add the patch to CVS to make it easier for NTSC users.
> > Any opinions?
> 
> I am assuming that if I were to use the v4lctl utility, the full featured dvb
> card would still default back to PAL during channel changes until the card locks
> to another NTSC signal (still creating the scrolling on the monitor during each
> channel change).

No, v4lctl changes the default setting in the firmware using the
video4linux interface of the driver. The default setting is used
whenever no signal is being received.

The driver patch works _exactly_ the same way.

> Actually, patching the driver is a secondary solution to the 
> the initial problem of the firmware defaulting to PAL mode.  For a NTSC user, it
> is very difficult to initially learn the remote control functions in VDR because
> the card does not try to lock a signal until the remote is learned.

Just insert a 'v4lctl setnorm ntsc' between loading the driver and
starting vdr.

> So, the 
> only way I have been able to get VDR to train the remote control is play a NTSC
> based mpg file through mpegpes before I start VDR to get the card locked to
> NTSC.  It is almost as if we need two versions of firmware.  But, this solution
> from Anssi (adding a default broadcast format to the module) will definitly help
> for normal NTSC usage.

See above.

Regards,
Oliver

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