[mythtv-users] Firewire channel change for SA4200?

steve networks1 at cox.net
Thu Jan 21 00:26:54 UTC 2010

>>>> I am hoping to set up firewire channel change for a Scientific Atlanta
>> 4200
>>>> box.  I checked the mythtv docs ./contrib/channel_changers as suggested
>> on
>>>> the wiki.  It doesn’t have a changer for the sa4200 but it has one for
>> the
>>>> sa3250.
>>>> Does anyone know is this changer will work for sa4200?  If so, would I
>>> use
>>>> similar compile arguments as given in the wiki for the Motorola box,
>>>> cc -std=gnu99 -o sa3250ch sa3250ch.c -lavc1394 -lrom1394 -lraw1394
>>>> If not, does anyone know if there is a channel changer available for
>>>> sa4200?
>>>I know nada about the SA boxes, but really, it ought to be possible
>>>for us to have a single firewire channel-change program that covers
>>>all set top boxes. They're all using libavc1394 for communications
>>>(A/V Commands over 1394), which is pretty well defined for all the
>>>basics we need. MythTV changes channels on most (all?) firewire set
>>>top boxes internally for firewire recording devices, anyway... (not
>>>that I have time or desire to do anything about this myself right now,
>>>I'm just sayin').
>> That would be most helpful for all of us non-wizards.
>> Meanwhile, I have found evidence in the 0.20 release notes and here
>> http://www.gossamer-threads.com/lists/mythtv/users/209687 that someone
>> modified the sa3250 changer code to work with the sa4200 too.
>> Now if I only knew about the compile arguments.  I suppose the README for
>> that changer would answer all these questions, but it's empty.
>MythTV's internal firewire channel changer should work with your
>SA4200.  MythTV's internal channel changer works very well with my
>SA3250HD, which I set-up as a SA4200 in MythTV.  (My SA3250HD had to
>be setup as a HD4200 under Myth to properly change channels.)

Where/how did you set that up?  The only thing I can find in mythsetup is a
reference to an external channel changer under input settings.  Did a google
search on mythtv channel changer and only found reference to external
channel changers. 

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