[mythtv-users] firewire to change channel but use coax to record

Scott Bickford bic1ster at gmail.com
Tue Jun 10 01:04:42 UTC 2008

> I do exactly the same thing with my configuration... SA4250HDC that will
> not
> work reliaby to capture via firewire (damn you Rogers Cable), but has
> flawless firewire channel changes. I have it connected to the svideo input
> of a pvr150 and use the sa4250ch_guid firewire channel changer from the
> ubuntu forums ( http://ph.ubuntuforums.com/showthread.php?t=756508 ). I've
> been running it for 3+ months this way and haven't missed a recording yet.
> As soon as I see mythtv support for the HD-PVR, I'll switch this connection
> over to one of those and be even happier.
> I'm not in front of my backend atm, so the following is from memory. It
> should at least get you in the right general section for making it work. If
> you need clarification let me know and I'll do a step-by-step tonight when
> I
> can sit in front of my backend machine.
> Just go into the 'input connections' section of mythtv-setup for your
> pvr350
> card and point the appropriate input to your digital cable video source.
> You
> mentioned using coax input (I assume you mean the f-connector RF tuner
> input), but I highly recommend using svideo if you can. Within that setup
> is
> a location for specifying a channel change script if needed. Place the
> /full/path/to/sa4250ch in that field, then continue through to the end of
> mythtv-setup as normal. You should now be able to select digital cable
> channels on that input of the pvr350 and the external changer script will
> tune the SA4250 to the correct channel.
> One other hint I found was to go in to the setup menu for the SA4250 and
> change the 'power on' option to power up the box whenever a number key is
> pressed. If for any reason your SA4250 gets powered off (like when a
> firmware update is pushed from your cable provider in the middle of the
> night) it will power itself back on during the channel change for the next
> recording. No more recording 2 hours of black screen instead of that "can't
> miss" movie you just missed.
> Shawn Flynn
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> mythtv-users at mythtv.org
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I got the channel changer compiled and working ok.

In mythtvsetup I deleted everything and started with pvr-350 s-video1 input
as default and sa4250_ch as channel changer for it.  This works ok.
Playback is ok, unfortunately there's no sound as I don't have the adapters
to hook up to my sound card right now.    For now, I setup coax / tuner 1
with the sa4250_ch.

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