Re: HVR 1600 Distortion

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Yes it does.  Which is nice actually: capture both digital and RF analog at the same time. :)

Josh Borke <joshborke@xxxxxxxxx> wrote:

>On Sat, Sep 18, 2010 at 8:58 PM, Devin Heitmueller
><dheitmueller@xxxxxxxxxxxxxx> wrote:
>> 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! ÂReplies 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. ÂIt happens to all analog channels with some
>>>>> >> slightly better than others. ÂI 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. ÂAny 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"? ÂOn 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". ÂThe
>>>>> distortion happens across most of the screen with it being
>>>>> concentrated in the top third. ÂAdditionally 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. ÂKeep 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? ÂIf the problem is only with RF, then it could
>>>>> > be an incoming signal distortion problem. ÂDo you have cable or an over
>>>>> > the air antenna for analog RF?
>>>>>
>>>>> I only have input for the RF tuner. ÂI have cable for analog RF.
>>>>
>>>> Please try and test the output of a VCR or DVD play plugged into the
>>>> HVR-1600. Â(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
>>
>
>It could be the tuner card, it is over 2 years old...Why would the
>analog tuner stop functioning while the digital tuner continues to
>work?  Is it because the analog portion goes through a different set
>of chips?
>
>Thanks,
>-josh
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