au0828 errors and mangled video with Hauppauge 950Q

au0828 errors and mangled video with Hauppauge 950Q

[Connor Behan]

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Ccing Devin. I'm pretty sure the analog side has a problem at the driver
level.

On most days, one cannot pickup an ATSC signal where I am, so I am
trying to capture analog video with a Hauppauge WinTV HVR 950Q. Whether
I use Television, Composite or S-Video, I see the same corrupted video
such as this: http://imgur.com/c398F4v

It is supposed to be a hockey game. When the broadcast cuts to a
commercial, I still see frames of the game for about 5 seconds, then the
fuzzy stuff on the screen contains some images from the game and some
images from the commercial, then it fully switches over to the
commercial. Frames that are supposed to be seen at different times are
being mixed together.

When I enable debugging for all of the media modules, my dmesg is
dominated by au0828 calls to print_err_status:
http://pastebin.ca/2628011 When I enable debugging on all modules except
the au0828, what I see is:

Insert tuner: http://pastebin.ca/2628012
mplayer tv:///2: http://pastebin.ca/2628017

Does this shed light on the problem? I'd be happy to test patches.


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Re: au0828 errors and mangled video with Hauppauge 950Q

[Devin Heitmueller]

On Wed, Feb 5, 2014 at 1:05 AM, Connor Behan <connor.behan@gmail.com> wrote:
> Ccing Devin. I'm pretty sure the analog side has a problem at the driver
> level.
>
> On most days, one cannot pickup an ATSC signal where I am, so I am
> trying to capture analog video with a Hauppauge WinTV HVR 950Q. Whether
> I use Television, Composite or S-Video, I see the same corrupted video
> such as this: http://imgur.com/c398F4v

Looks like insufficient USB bandwidth available to support the 24
MB/second required for uncompressed analog video.

Is this on an x86 PC?  Or some embedded target such as ARM?  If the
latter, then the answer is almost certainly that the USB host
controller implementation is garbage and cannot handle the throughput.

Devin

-- 
Devin J. Heitmueller - Kernel Labs
http://www.kernellabs.com

Re: au0828 errors and mangled video with Hauppauge 950Q

[Connor Behan]

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On 05/02/14 01:46 AM, Devin Heitmueller wrote:
> On Wed, Feb 5, 2014 at 1:05 AM, Connor Behan <connor.behan@gmail.com>
> wrote:
>> Ccing Devin. I'm pretty sure the analog side has a problem at the driver
>> level.
>>
>> On most days, one cannot pickup an ATSC signal where I am, so I am
>> trying to capture analog video with a Hauppauge WinTV HVR 950Q. Whether
>> I use Television, Composite or S-Video, I see the same corrupted video
>> such as this: http://imgur.com/c398F4v
> Looks like insufficient USB bandwidth available to support the 24
> MB/second required for uncompressed analog video.
>
> Is this on an x86 PC?  Or some embedded target such as ARM?  If the
> latter, then the answer is almost certainly that the USB host
> controller implementation is garbage and cannot handle the throughput.
>
> Devin
>
It's an x86 PC but bandwidth was indeed the problem. I thought I was
having a power issue before. So I started using a Cardbus to USB adapter
that had an external power port. This was a mistake, and I can get the
tuner to work again if I switch back to a built-in port.

Thanks a lot.


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