[mythtv-users] Can I suppress a particular backend error message?

Michael T. Dean mtdean at thirdcontact.com
Wed Jun 3 22:56:06 UTC 2009

On 06/03/2009 06:37 PM, John Pilkington wrote:
> I've just brought back into use in 0.21 fixes an old usb dvb-t device 
> that I had stopped using when it apparently became incapable of tuning 
> the more complex multiplexes.  I find that if I collect the multiplex 
> info tables by scanning with a more capable card the old device still 
> gives good recordings, but it produces an error message about once a 
> second while doing so. I'm using it as virtual tuners 5 and 6, so it's 
> not often active.
> 2009-06-03 22:48:01.364 PIDInfo(0): Failed to open demux device 
> /dev/dvb/adapter0/demux0 for filter on pid 0x104
> Janne created patches two years ago that, IIRC, fixed this; patches 
> were 12572 and 12800 for ticket #1970.  The new messages are more 
> informative but rather too insistent.  Using 'mythbackend -v norecord' 
> risks losing really useful information. Is there a more specific option? 

Actually, that message is an important message (meaning you'll get it 
unless you do -v noimportant).

If you really want to ignore it, just filter the logs--i.e. start 
mythbackend without -l and redirect output to a program that ignores 
that line:

mythbackend 2>&1 | grep -v 'Failed to open demux device' > filtered_log

Or just comment out the message (or change it's log level) in the 
source.  mythtv/libs/libmythtv/dvbstreamhandler.cpp around about line 845.


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