[mythtv-users] IR Blaster not always changing channel

Chris Tepe cstepe at ctdataservices.com
Thu Dec 16 03:44:02 UTC 2010

On mine I have the emitter taped to the IR extender that came with the 
STB and taped over the ir port on the box itself.  since the emitter box 
has an 1/8 jack for the emitter and the STB has an 1/8 jack for the 
extender.  Is it possible to just hard wire the two together and 
eliminate the ir sender and receiver ends?
On 12/15/2010 1:14 PM, Ben Eisemann wrote:
> I spent a significant amount of time troubleshooting what I thought
> was an LIRC problem.
> I ended up taking a piece of plastic conduit and "isolating" the IR
> transmitter and receiver by taping them at either end of the tube.
> Worked like a champ after that.  Turned out stray signals were
> bouncing of a near by object and causing all sorts of weird issues
> like missed channel changes, double channel changes, etc.
> God Bless,
> Ben T. Eisemann
> beisemann at gmail.com
> Anxiety does not empty tomorrow of its sorrows, but only empties today
> of its strength.—Charles Spurgeon
> On Wed, Dec 15, 2010 at 3:42 AM, Fredrik Hallgarde<mythtv at tedde.nu>  wrote:
>>>> I have an IR blaster set up to control my STB.  It works 90% of the time
>>>> but 10% of the time it fails to change the channel.  I've put some logging
>>>> in the channel change script so it is getting called.  I've tried putting a
>>>> delay in the script and also sending the command twice within the same
>>>> script but it has not improved the reliability.  some times it will pickup
>>>> just the first digit and sometimes just the last.
>>> Try adding 'min_repeat X', where X is something in the 2-5 range,
>>> to the blasting remote stanza in lircd.conf, bounce lircd and see
>>> if it behaves any better.
>> And if you want to go further may I suggest you have a look at Auric's
>> script that use screen scraping to make channel changing more reliable (but
>> also a bit more complex).
>> http://web.aanet.com.au/~auric/?q=node/9
>> I used it with an STB with a lousy receiver and it worked well until
>> a) the STB froze (couldnt handle the uptime of Mythtv...)
>> b) they changed the location of the channel number in the OSD.
>> Please note the information about broken mplayer -sstep
>> Fredrik
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