[mythtv-users] DVB OSD Signal always 0%

Roger rogerx at sdf.lonestar.org
Wed Jun 3 00:49:23 UTC 2009

On Wed, 2009-06-03 at 08:58 +1200, Nick Rout wrote:
> I think some cards, or some drivers perhaps, do not report such
> statistics correctly.

>From the maintainer of pvrusb2 ... 

"When you are playing a dtv stream, the pvrusb2 driver has very very 
little control over what is going on.  This because the DVB 
infrastructure prefers to "own" the hardware while in dtv mode.  All the
pvrusb2 driver does really here is pass through the mpeg data stream and
otherwise stay out of the way of DVB.  So any kind of status info while 
in dtv mode really has to come from the DVB core not the pvrusb2 driver.
Thus the sysfs interface and ALL of the V4L interface is effectively 
unusable once a DVB application has taken the reigns.  What 
ctl_signal_present only will tell you is the status when you are in 
television or radio mode not dtv mode.

...I am limited to with the DVB internal architecture as it currently
stands.  There are a few ideas being tossed around that might mitigate
this, but at the moment they are just ideas (actually really only one

(Hence, it's not a driver issue but an in-kernel V4L/DVB issue)


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