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Digital to Analog channel change snow
PostPosted: Tue May 08, 2007 7:11 pm Reply with quote
lordjavac
 
Joined: 13 Nov 2006
Posts: 12




When I'm watching a digital channel on my pcHDTV 5500 and then change the channel to an analog one, I get a brief stint with the analog channel, but then it changes to snow. This is particularly annoying as it's killing my recordings in MythTV. It seems to be fine as long as it doesn't go straight from ATSC to NTSC. I have 2 identical cards in the computer running on x86_64 gentoo. Thanks.
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PostPosted: Tue May 08, 2007 8:33 pm Reply with quote
xyzzy
 
Joined: 12 Feb 2006
Posts: 225




search for dvb_shutdown_timeout
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PostPosted: Tue May 08, 2007 10:02 pm Reply with quote
lordjavac
 
Joined: 13 Nov 2006
Posts: 12




xyzzy wrote:
search for dvb_shutdown_timeout


I have the dvb_shutdown_timeout set to 0 in my /etc/modules.d/dvb-core. If that is the issue, then I need to set it elsewhere. Any hints on where to set it on gentoo 2.6.20?
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PostPosted: Wed May 09, 2007 1:38 am Reply with quote
xyzzy
 
Joined: 12 Feb 2006
Posts: 225




Maybe you didn't set the mythtv option to only open the dvb device on demand?
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PostPosted: Wed May 09, 2007 8:46 am Reply with quote
lordjavac
 
Joined: 13 Nov 2006
Posts: 12




xyzzy wrote:
Maybe you didn't set the mythtv option to only open the dvb device on demand?


No, I've got that set too. Are there any other options that would affect this behavior? I checked dmesg and didn't see anything that looked like an error. It seems like what's happening is that the digital is shutting down the tuner slightly after the channel change.
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PostPosted: Wed May 09, 2007 12:47 pm Reply with quote
xyzzy
 
Joined: 12 Feb 2006
Posts: 225




Make sure this really does return 0.
cat /sys/module/dvb_core/parameters/dvb_shutdown_timeout

It does sound like the analog device is getting opened before the digital tuner is shut down. I don't use mythtv, but other people are able to get this to work.
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PostPosted: Wed May 09, 2007 11:44 pm Reply with quote
lordjavac
 
Joined: 13 Nov 2006
Posts: 12




xyzzy wrote:
Make sure this really does return 0.
cat /sys/module/dvb_core/parameters/dvb_shutdown_timeout

It does sound like the analog device is getting opened before the digital tuner is shut down. I don't use mythtv, but other people are able to get this to work.


Okay, I did that and it says "5". So what am I doing wrong in setting that option? I have it set in /etc/modules.d/dvb-core. Should it be in /etc/modules.d/dvb_core? Is it the dash versus underscore? I'm sure this is what's causing the problem, now I just need to fix it. Thanks.
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PostPosted: Fri May 11, 2007 1:22 am Reply with quote
lordjavac
 
Joined: 13 Nov 2006
Posts: 12




OK, I've fixed it. Turns out I had made dvb_core part of the kernel, instead of a module. This effectively ignored /etc/modprobe.conf and rebuilding things with dvb_core as a module fixed the issue. Thanks for pointing me in the right direction.
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PostPosted: Thu Dec 25, 2014 11:45 pm Reply with quote
Arjumand
 
Joined: 25 Dec 2014
Posts: 1




What program are you using to watch tv? Does this happen all the time or just occasionally? This could be a result of noise in the signal. Use dtvsnr to find out your SNR (signal to noise ratio). It should generally be above 25 for a decent picture without much distortion.

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Digital to Analog channel change snow
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