[mythtv-users] So confused. Firewire to STB - channel change script - mythchanger

Philip Isaacs showcasefloyd at gmail.com
Mon Mar 24 18:12:10 UTC 2014

On Mon, Mar 24, 2014 at 10:48 AM, Eric Sharkey <eric at lisaneric.org> wrote:

> On Sat, Mar 22, 2014 at 3:26 PM, Bob Shanteau <rmshant at gmail.com> wrote:
> > On 3/22/2014 6:11 AM, Philip Isaacs wrote:
> >>
> >> So I'm experimenting with using a Firewire to connect to my STB and that
> >> seems to be working.
> >>
> >> But now I want to set up the external channel change command script.
> >
> >
> > Why do you want to use an external channel change command script? I
> simply
> > subscribed to schedulesdirect.org, told mythv about my Comcast STB,
> gave it
> > my schedulesdirect.org login and password and it changes channels
> > automatically.
> I think that only works when you're actually recording over firewire.
> If you're only using firewire to change channels, but recording with
> something else (e.g. analog capture with an HDPVR or something
> similar), mythtv still requires a script as far as I know.
> Eric

Yeah, I was under the same impression myself.

Anyhow, as a follow up I was able to download and compile the mythchanger
script but it did not work for my STB (SA/Cisco RNG 150N). So after some
more research I found a newer better script "stb-command" and this worked
pretty much out of the box.

So the channel changing works and I can capture video perfectly
running the test-mpeg2
script. But MythTV still seems to be not working with this set up. I can
set the firewire up as a capture device with no problems. Myth finds the
GUID and STB okay. But when I go into the front end and try to watch live
TV i get a black screen. After looking at the /var/lib/mythtv/livetv
directory I see it creates a 0 bytes file.

So I'm stumped. I did read on the Myth/Fire_Wire Wiki page that this could
be caused by some STBs "likely not sending a proper PAT and/or PMT in the
transport stream" but I have no idea what this means. The WIKI did mention
a work around for it, but no explanation of how to do it.

Has anyone else had issues like this and also are there other tests I
should run to determine if this is the cause of if it might be something
else that's causing the blank screen.

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