[mythtv-users] Comcast STB upgrade breaks firewire channel changing

[Christian Szpilfogel]

On 09/03/2011 6:06 AM, Nasa wrote:
>
>> I'm pretty sure "mythchanger -f" with either 2 or 4 should work for
>> the
>> SA3250. It will not need any code changes as the -f option forces the
>> protocol choice.
>>
>> By chance did your cableco move to 4 digit channels?
>>
> I really wish that were the case, but no.  And no, the "-f" option (with either
> 2 or 4) doesn't work for me :{
>
It is worth trying all options from 1 to 7. Even though it looks like 
each encoding is for a different box, the reality is that these are all 
permutations allowed within the standard. If none of these work then 
there is a permutation missing.

What mythchanger does is use the PANEL commands for an STB. This in 
effect is like pressing the buttons on a remote or front panel of the 
STB. Sometimes you can send the digits in a block (usually optional) but 
sometimes they have to be sent button by button. Sometimes the STB is 
looking for key press down and in others key press release. And in some 
cases like some SA boxes it is looking for a key press down followed by 
a key press release. The sequence of buttons required to change the 
channel should be the as on your remote. So if you need to press enter 
at the end then you will also need to do this via firewire (say using 
stb-command). The protocol for this has not been more complicated than 
this in my experience.

You can play with the code and try different options based on the 
examples you see. The first thing to note is try any digits with various 
options and see if the STB is responding at all.