[mythtv-users] Firewire channel change

Peter Bennett (cats22) cats22 at comcast.net
Sun Nov 4 21:21:35 UTC 2012

On 11/04/2012 02:39 PM, Joe Henley wrote:
>> Thanks for that..I did read it before,but so far no joy... 
> Greg,
> I use firewire to change channels on the set top box which is then
> connected to a HD-PVR.  When I set up my system, I make fairly detail
> notes on what I did.  ...helps to offset the short memory of an old
> fart.  The stuff below is how I set up my firewire, perhaps you'll get
> some ideas for yours from it.
> -1- Modify mythtv-setup (on the backend) to use "/usr/sbin/sa_control
> -w 12000 " in the "external channel changer" field in the input
> connections set up screen (of mythtv-setup). Note the blank at the end
> of the line.
> -2- Add:  "ExecStartPre=/usr/bin/plugctl -p 0 -n 1
> "oPCR[0].n_p2p_connections=1"  to /lib/systemd/system/mythbackend.service
> This is for Ferdora 16; use rc.sysinit or whatever for your system
> -3- The firewire driver creates the device nodes: /dev/fw0 and /dev/fw1
>           "sa_control" (and most of the utilities) need _*root*_
> access to the firewire controller rom
>           But Myth FE runs as user "mythtv", so sa_control doesn't
> work within Myth FE
>           I tried:    Add the video group and the [root, minimyth,
> mythtv, video] users together
>                        Add a /etc/udev/rules.d/80-mythtv-rules to set
> the owner, group and mode to:  root, root, 0666.  This will over-ride
> some stuff in /lib/udev/rules
>                         None worked
>           What worked:  Modify:  "/etc/udev/rules.d/80-mythtv.rules"
> as shown below  (note the "/etc")
> ---------------------------- snip
> -----------------------------------------------------------------------------------------
> # Set up the firewire devices with a more helpful mode
> # (Ripped off from /lib/udev/rules.d/50-udev-default.rules) <== note
> the "lib"
> # ==========================================================  
> KERNEL=="fw[0-9]", ATTR{vendor}=="0xd00d1e",
> ATTR{model}=="0x000001",     \
> SYMLINK+="FWire_0", MODE="0666", OWNER="mythtv", GROUP="mythtv"
> KERNEL=="fw[0-9]", ATTR{units}=="*0x00a02d:0x010001*",
> SYMLINK+="FWire_1",    \
> MODE="0666", OWNER="mythtv", GROUP="mythtv"
>         I'm not sure why FWire_0 and FWire-1 ended up with owner/group
> = root/root, but it works.
> ---------------------- snip
> ----------------------------------------------------------------------------------------
> Good luck!  Let uss know how it works.
> Joe Henley
> _______________________________________________
If you are on Comcast you may have problems tuning the STB with
Firewire. I was unable to get channel changing through firewire to work
and eventually purchased an IguanaIR. This works well after a bit of
tweaking. If anybody has managed to get firewire tuning to work with
Comcast STB I would be interested to know how to do it.


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