[mythtv-users] firewire with 3250

nik gibson nik.gibson at gmail.com
Wed Nov 22 16:09:23 UTC 2006


How do you change between firewire and S-video?  I would love to
differentiate between the two and be able to get the channels that I can't
receive over firewire all through the same box.

Thanks

On 11/21/06, Eric Smith <erictsmith at gmail.com> wrote:
>
> I did a little bit of testing with this last night and had moderate,
> but not complete success.  As far as i can tell, at the moment I have
> no choice but to try to implement something like this on channel
> change.  Why are you hesitant of doing this Jim?  I have not
> experimented much with broadcast, but what i did seemed to be
> consistent failures... and even if it worked that would not impact the
> issue below would it?
>
> I am running a single SA3250HD and using both the firewire out for the
> available HD channels and the s-video out for some non-HD digital
> channels.  Quite often when switching from one of the channels being
> fed from s-video back to firewire the firewire stream is lost.  The
> channel is changed correctly almost everytime, but the STB will not
> enable streaming (as if the new channel is 5C)  In the past it seemed
> the only way to resume the connection was to unplug and replug the
> firewire cable from the cable box.  What i noticed last night was that
> some but not all of my available HD channels would work as the first
> HD channel when using the sure_change script.  For example....
>
> 301 - HBO non HD fed over s-video
> 1421 - ABC HD over firewire
> 1460 - TNT HD over firewire
>
> Start on 301 -> Change to 1421 (Stream is lost)
> Start on 301 -> Change to 1460 (Works)
> Start on 301 -> Change to 1460 (Works) -> Change to 1421 (Works)
>
> I have no idea what would be causing this behavior.  Any thoughts?  Or
> things I can try?  My only other thought was to add into the channel
> change script to change to 1460 automatically if the stream is not
> successful, retest, and then if 1460 is working change back to the
> intended channel.  Obviously this is not an ideal situation, but i
> figure i can at least give it a try to determine if the behavior i was
> seeing last night is actually consistent.
>
>
>
> On 11/20/06, Yeechang Lee <ylee at pobox.com> wrote:
> > Jim Westfall <jwestfall at surrealistic.net> says:
> > > I will say I have always been suspect of people using these scripts on
> > > channel change, especially on 6200 devices.
> >
> > Me too. I outline in
> > <URL:http://www.gossamer-threads.com/lists/mythtv/users/233570#233570>
> > how to simply and easily prime FireWire using firewire_tester at
> > bootup with no further pre channel-changing priming needed for 100%
> > reliable recordings. (I should have also said, though, in that
> > message, that one needs to switch to Broadcast in mythtv-setup.)
> >
> > This has nothing to do with the accuracy of channel changes, however;
> > I still face the issue of how every 20-30 recordings a FireWire-based
> > channel change will not go through right
> > (<URL:http://www.gossamer-threads.com/lists/mythtv/users/236728#236728
> >),
> > typically keeping the box set to the previous channel. FireWire always
> > records fine, but not necessarily the right channel.
> >
> > --
> > Yeechang Lee <ylee at pobox.com> | +1 650 776 7763 | San Francisco CA US
> > _______________________________________________
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> >
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