I put a test together to exercise this. I don't know if I have the version you are referring to with the "Audio microcontroller" messages, but I'll watch /var/log/messages for that.
Rich -- Rich Kadel Appeligo, Inc. (858) 433-1747 www.appeligo.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Hans Verkuil Sent: Sunday, September 16, 2007 4:44 AM To: Discussion list for development of the IVTV driver Subject: Re: [ivtv-devel] spontaneous muting On Wednesday 29 August 2007 17:55:02 Rich Kadel wrote: > No, I'm certain it's not heat related. I started collecting video > about a week ago on two servers that have been up 24/7 for months in > a controlled colocation facility, and the problem developed over the > next few days. I was using tuners that had been used for VBI > collection up until that point. > > FYI, I'm trying a couple of things now to see if I get better > results. Both of my production servers have multiple PVR-500s (3 in > one and 4 in the other), with most recording VBI. Now I dedicate one > tuner per server to video capture (and no VBI). I saw the color > problem on both servers plus on my development server. So here's > what I'm trying: > > 1. Moving the video from ivtv5 and ivtv7 to ivtv0. (Cyrus A reported > muting problems with the second tuner on a PVR-500, but not the > first, and I THINK that's what I noticed) > 2. Closing the device when I don't need to capture video. > (Previously, my software continually read from the device and piped > output only when needed.) I'm only recording short clips based on an > algorithm, so this will open and close the device many times per > hour. I don't know if this will help, but the problem only developed > after I started reading from the video device continually for hours > or days, which I've never done before. 3. Creating a convenient way > for me to monitor the results by server and time. I should be able > to provide clearer information on the symptoms if this occurs again. > > It's been 12 hours, and so far it still looks good. But I need a few > days to be sure. Have you ever tried switching the channel to another frequency and back again when the audio/video problems develop? I wonder if the tuner frequency might be drifting over time. Besides going to B&W does the amount of noise in the video also increase? I mean, the whole chain of losing color, then audio muting suggests a tuner issue. Note that the latest v4l-dvb has better status reporting (you might already be using it, I don't know). If the cx25841 cannot lock onto a proper audio signal you'll get this line: Audio microcontroller: detecting If after changing the frequency (try just setting the same frequency) it changes to 'running', then it is almost certainly a tuner issue. You can also try using the S-Video or composite input: if you get the same problems there, then it must be a cx25841 problem instead (since the tuner is not used in that scenario). Regards, Hans _______________________________________________ ivtv-devel mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-devel _______________________________________________ ivtv-devel mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-devel
