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Re: [ivtv-devel] Problems with Hauppauge HVR 1600 and cx18 driver Brandon Jenkins Fri Apr 03 15:02:00 2009

On Sun, Mar 29, 2009 at 10:25 AM, Brandon Jenkins <[EMAIL PROTECTED]> wrote:
> On Sat, Mar 28, 2009 at 11:27 PM, Andy Walls <[EMAIL PROTECTED]> wrote:
>> On Mon, 2009-03-23 at 06:52 -0700, Corey Taylor wrote:
>>> > Andy,
>>>
>>> > I am noticing an improvement in pixelation by setting the bufsize to
>>> > 64k. I will monitor over the next week and report back. I am running 3
>>> > HVR-1600s and the IRQs are coming up shared with the USB which also
>>> > supports my HD PVR capture device. Monday nights are usually one of
>>> > the busier nights for recording so I will know how well this holds up.
>>>
>>> > Thanks for the tip!
>>>
>>> > Brandon
>>>
>>> Hi Andy and Brandon, I too tried various different bufsizes as suggested 
>>> and I still see very noticeable pixelation/tearing regardless of the 
>>> setting.
>>>
>>> I even upgraded my motherboard this past weekend to an Asus AM2+ board with
>>> Phenon II X3 CPU. Still the same problems with the card in a brand new
>>> setup.
>>>
>>> I also tried modifying the cx18 source code as Andy suggested and that
>>> made more debug warning show up in my syslog, but still did not
>>> resolve the issue. Haven't tried this yet with the new motherboard
>>> though.
>>>
>>> Is it possible that this card is more sensitive to hiccups in the
>>> signal coming from the cable line? Or interference from other close-by
>>> cables and electronic equipment?
>>>
>>> When recording/watching Live TV through MythTV, I see that ffmpeg is
>>> constantly outputting various errors related to the video stream. I
>>> can post those here if you think it's relevant.
>>>
>>> Shoud I just return this card and get one with a different chipset? Or
>>> do you think driver updates can solve the issue?
>>>
>>> I'm happy to hold on to this card if it means I can contribute in some
>>> way to fixing the problem, if it's fixable : )
>>
>> Corey and Brandon,
>>
>> I found a race condition between the cx driver and the CX23418 firmware.
>> I have a patch that mitigates the problem here:
>>
>> http://linuxtv.org/hg/~awalls/cx18/rev/9f5f44e0ce6c
>>
>> I think the final form of the patch could be better.  However, this
>> patch essentially eliminated any artifacts I was getting playing back
>> digital TV.  I also had positive results running mplayer without the
>> "-cache" command line for both digital and analog captures.
>>
>> I haven't tested on a single processor machine, nor in a multicard
>> setup, but things looked good enough that I thought it ready for test by
>> others.
>>
>> Let me know if it helps or not.
>>
>> Regards,
>> Andy
>>
>>
> Hi Andy,
>
> I have cloned this tree and loaded on the server. I'll let you know
> over the next couple of days if there is any improvement.
>
> Thanks!
>
> Brandon
>

Andy,

Based on continued discussions it seems you're still exploring things.
I can tell you that the analog captures are still exhibiting
artifacts. I'll get to some of the HD captures tonight.

Brandon

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