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PostPosted: Fri May 06, 2005 8:24 pm 
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Joined: Sun Feb 20, 2005 11:29 am
Posts: 19
Location: Garden Grove, CA
My security system has a 8 camer switcher that has outputs going to a Digital UHF modulator output on 17. All the Tv's can get this with no problem but I can not seem to get Mythtv to see it.

I used channel editor on the initial setup to add 17 but I can not view or record it.

Any sujestions ????

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Doug Laing
doug@laingelectronics.com
Hotmail/Trillian (doug-laing@hotmail.com)


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PostPosted: Mon May 09, 2005 9:52 am 
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Joined: Tue Apr 13, 2004 6:51 pm
Posts: 890
Location: Groton, MA
After some more research following the advice here, i am now versed in the 'star' layout and signal loss, etc. I'm looking at a something like this from ChannelPlus
http://www.channelplus.com/product_detail.php?productId=38
Image
dual modulator, cable-in and 5 outputs....seems like everything in one box.

Here is what concerns me. Will this gear work with digital cable? my cable does not have any channels between 95 and 200, so can I use channels 101, 103 with the modulators? can I filter the cable feed w/o killing the digital channels? maybe a notch filter? where in the spectrum is the digital data?

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 Post subject: Channel Vision Modulator
PostPosted: Wed May 11, 2005 11:15 am 
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Joined: Sun Feb 20, 2005 11:29 am
Posts: 19
Location: Garden Grove, CA
I use the 3 input Channel Vision Modulator
Image
From Smarthome.com
http://www.smarthome.com/7702.html

The have 1, 2, and 3 channel versions of this product. I take my antenna siginal and the output of this and run it into a 2 way splitter/combiner and then to a fixed gain amp.

We have Mythtv, DirectTV/Tivo, and a security system on the three outputs on chanel 17, 20, & 38.

Works great so that everyone can see the output on a regular TV channel.

I have been trying to figure out how to use the Mythtv to record the output of the Tivo or Security system via a non-standard channel, but it seems that people think it can be done but have no idea on how to configure it to allow you to actually record on a channel that is not coming from Zap2it data feed.

I did find a workaround (but its a pain), I can configure a channel in Zap2it that we do not get here but is in the list then move my Tivo to that and manually record. The problem with this is if you want to move a 1 hour program from the Tivo to this box you have to setup a dummy recording that matches the time length you want then start the playback at the correct time. It also will end up with the name from the program guide, not what it actually is.

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Doug Laing
doug@laingelectronics.com
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 Post subject:
PostPosted: Wed May 25, 2005 7:00 pm 
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Joined: Tue Apr 13, 2004 6:51 pm
Posts: 890
Location: Groton, MA
Doug,

Here is what I have setup so far.

cheap camera is fed into a ChannelPlus modulator (set to channel 74)
output of modulator is combined with cable with temp cheap splitter
non myth TV's see camera image on 74


For myth box, I used Webmin to add a record to the channel table for
Code:
channel 74
chanid       1074
channum    74
freqid        74
sourceid    1
callsign    cam1
name         cam1
icon         none
finetune    0
videofilters    
xmltvid    99999
recpriority      0
contrast    32768
brightness    32768
colour          32768
hue          32768
tvformat    Default
commfree    0
visible    1
outputfilters   


Now i can tune myth box to 74 and see camera output

I can also see an row in Mythweb for channel 74 (cam1). I can easily set a manual recording for any time/length with a name I provide. Once a manual recording has been scheduled, it is listed in teh mythweb program guide.

Things for me to do:
- Get a 'real' splitter/combiner, probably power injecter. maybe 2 in / 8 out
- figure out best way to view modulated channels on cable boxes. probably need to filter away an existing (unused) channel and replace...otherwise cable box is 'too smart' to tune to camera. wont tune to 74 now since comcast lineup doesnt have 74

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 Post subject:
PostPosted: Sun Mar 11, 2007 10:59 am 
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Joined: Mon Feb 06, 2006 5:04 pm
Posts: 4
I couldn't quite get the original script to work. I changed the structure of the two if statements in the original to use if/then/else and it seems fine now.

My copy is below for reference:
Code:

#!/bin/sh

scampid=(`ps aux|grep mplayer|grep geometry|sed s/"mythtv   "//`)
if [ "$scampid" != "" ];then
        kill -9 $scampid
        scampid=(`ps aux|grep mplayer|grep geometry|sed /"mythtv   "//`)
        kill -9 $scampid
else
         mplayer -tv device=/dev/video2:driver=v4l:norm=pal:input=0  \
-double  -display :0.0 -geometry 100%:0% tv://

fi

Luke.


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