On Sat, Sep 18, 2010 at 8:42 PM, Josh Borke <joshborke@xxxxxxxxx> wrote: > On Sat, Sep 18, 2010 at 8:20 AM, Andy Walls <awalls@xxxxxxxxxxxxxxxx> wrote: >> On Fri, 2010-09-17 at 18:23 -0400, Josh Borke wrote: >>> Thanks for the response! Replies are in line. >>> >>> On Thu, Sep 16, 2010 at 6:48 PM, Andy Walls <awalls@xxxxxxxxxxxxxxxx> wrote: >>> > On Wed, 2010-09-15 at 22:54 -0400, Josh Borke wrote: >>> >> I've recently noticed some distortion coming from my hvr1600 when >>> >> viewing analog channels. It happens to all analog channels with some >>> >> slightly better than others. I am running Fedora 12 linux with kernel >>> >> version 2.6.32.21-166. >>> > >>> > >>> >> I know I need to include more information but I'm not sure what to >>> >> include. Any help would be appreciated. >>> > >>> > 1. Would you say the distortion is something you would possibly >>> > encounter on an analog television set, or does it look "uniquely >>> > digital"? On systems with a long uptime and lots of usage, MPEG encoder >>> > firmware could wind up in a screwed up state giving weird output image. >>> > Simple solution in this case is to reboot. >>> >>> I'm not sure if I would classify it as "uniquely digital". The >>> distortion happens across most of the screen with it being >>> concentrated in the top third. Additionally shows that include black >>> bars the top black bar is seemingly stretched and the image seems like >>> the colors are over-saturated where they colors are brighter. >>> Rebooting had no effect :( >> >> OK. >> >>> > 2. Have you ensured your cable plant isn't affecting signal integrity? >>> > http://ivtvdriver.org/index.php/Howto:Improve_signal_quality >>> >>> The cable plant hasn't changed the signal strength or integrity as far >>> as I know. >> >> OK. Keep it in the back of your mind though. >> >>> > 3. Does this happen with only the RF tuner or only CVBS or only SVideo >>> > or more than one of them? If the problem is only with RF, then it could >>> > be an incoming signal distortion problem. Do you have cable or an over >>> > the air antenna for analog RF? >>> >>> I only have input for the RF tuner. I have cable for analog RF. >> >> Please try and test the output of a VCR or DVD play plugged into the >> HVR-1600. (We don't need sound, just the video.) >> >> This will tell us if the problem happens before the CX23418 chip's >> analog front end (i.e. in the RF and analog tuner) or not. >> >> >> $ v4l2-ctl -d /dev/video0 -n >> (List of possible inputs displayed) >> >> $ v4l2-ctl -d /dev/video0 -i 2 >> Video input set to 2 (Composite 1) >> >> # v4l2-ctl -d /dev/video0 -s ntsc-m >> Standard set to 00001000 >> >> $ cat /dev/video0 > foo.mpg >> ^C >> > > I only have S-Video but doing this produced a perfect picture. Before debugging any further, it might make sense to install the tuner into a Windows box and make sure it's not just a hardware failure in the can tuner. Devin -- Devin J. Heitmueller - Kernel Labs http://www.kernellabs.com -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
