[mythtv-users] Firewire Channel Changing on SA4250HDC

[Daniel Arfsten]

Rob,
I am interested in knowing that's it is possible that my cable company may 
have my sa3250hd NOT accepting the tune command of the sa3250ch channel 
changing script either. I have been unsuccessful for over 40 hours of 
testing and playing around and googling, ensuring I was using the latest 
test-mpeg2 and firewire_tester, and sa3250ch channel changing script to no 
avail. My vendor code is in there and it appears to work but it just doesn't 
work! Here's my thread.
http://www.gossamer-threads.com/lists/mythtv/users/290860?#290860
Maybe you can point out anything that I may be doing wrong?? I should just 
call them and make sure the "tune" functionality is "enabled" on my boxes. I 
did specifically tell them that I needed the ports enabled for using it with 
my TIVO, just because I didn't want to haev to explain mythtv. What's weird 
is that I can capture my local stations with test-mpeg2 but no channel 
changing no matter what I do????? I don't even really care about being able 
to capture stuff, I just want to use s-video out on the cable box and use 
firewire to set the channel for mythtv to record but it's not working.

Daniel



Re: [mythtv-users] Firewire Channel Changing on SA

Has anyone had any luck with getting this STB to recognize
channel change
commands?

I've tried the firewire_changer code that Jim provided, and I'm
getting
exactly the same results that Brian got; failure on the
individual buttons,
and reported (but not actual) success on the the tune method.

I've modified the sa3250ch code to allow me to send hex commands
to the STB
and have been using the (admittedly old, but freely available)
AVC 3.0 spec
(http://pbx.mine.nu/dvhs/AVC_30.pdf), the avc1394.h file, and
various web
pages as guides.

I've been tinkering away at this for the last week, and so far
the only
thing that has worked is detecting the current power state of
the STB:

When power is off (via the power button on the STB):
AV/C Command: cmd0=0x01ffb27f cmd1=0x00000000
Response: 0x0CFFB260 cmd1=0x00000000
* *
When power is on (via the power button on the STB):
AV/C Command: cmd0=0x01ffb27f cmd1=0x00000000
Response: 0x0CFFB270 cmd1=0x00000000

I believe this box is supposed to meet the requirements of
FCC-03-225 (
http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-03-225A1.pdf<http://http//hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-03-225A1.pdf>)
which  requires STB's to support the pass through tune command
as described
in the non-freely available CEA-931-A spec. I am willing to
purchase
CEA-931-B (which superseded CEA-931-A) in order to try to go
further.

I can't believe that I'm the first person to work though this
(I'm not that
original ;) ). Does anyone already have this spec? I am aware
that the spec
is copyrighted, and I'm not looking for a free copy, but does
that prevent
implementing it? What am I missing?

Rob