[mythtv-users] HD-PVR Channel Changing Inquiry
mikep at randomtraveller.org.uk
Sat Jul 17 13:15:35 UTC 2010
Larry K wrote:
> Since Comcast hosed pretty much all my unencrypted QAM (except the networks,
> of course), I just picked up an HD-PVR, another STB, and have been reading
> through all the materials I can find.
> On this wiki -> http://www.mythtv.org/wiki/Hauppauge_HD-PVR
> There is ambiguous language about how to effect channel changes. At one
> point, it talks about how to configure a channel change script "if you care
> about changing channels". Seems like any HD-PVR user would care about that,
> right? Then, near the bottom, under the section entitled *"*Steps to Enable
> IR Transmitter*"*, it states that even with IR up and running, I will still
> need a channel change script. Is this true? If so, what is the point of
> IR? To just power the STB up and down? That seems hardly worth the effort
> of configuring IR. Did I miss something here? Anyway, if I need a
> separate channel change script, where can that be found, and if there are
> variants on that, where can I find the one most commonly used? Do these
> channel changing scripts operate over firewire? or over the USB cable?
> Seems like these important details are missing from the wiki, or maybe I
> just got up late this morning :)
> I am happy to update the wiki based on whatever feedback I can get here...
There are certain assumptions being made which you're obviously not getting.
Your STB normally requires input from a remote control, no? That signal is IR
The IR transmitter is used by myth to simulate a remote when myth needs to
change the channel on your STB to record something. How do you think myth tells
the IR transmitter, which is nothing more than an Infra-Red LED, what to send to
That's right, a channel change script. When you set this value in your tuner
definition in mythtv-setup, myth knows to run this script whenever it needs to
change channels on that 'tuner'. Depending on what STB - or other device - the
tuner entry actually represents you may need one of several different channel
change scripts. That's why it is done this way, rather than you just picking
something from a list.
The script may just send digits out a serial port, or it may transmit a firewire
signal, or talk to a LIRC driver, or something else. It's up to you to figure
out what your particular setup requires and provide a suitable script.
Unfortunately, practically *everyone's* system is unique. Good luck.
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