Re: cx231xx kernel oops

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On Mon, December 12, 2011 8:22 am, Devin Heitmueller wrote:
> On Mon, Dec 12, 2011 at 10:58 AM, Yan Seiner <yan@xxxxxxxxxx> wrote:
>>> Also, just to be clear, the USB Live 2 doesn't have any onboard
>>> hardware compression.  It has comparable requirements related to USB
>>> bus utilization as any other USB framegrabber.  The only possible
>>> advantage you might get is that it does have an onboard scaler, so if
>>> you're willing to compromise on quality you can change the capture
>>> resolution to a lower value such as 320x240.  Also, bear in mind that
>>> the cx231xx driver may not be properly tuned to reduce the alternate
>>> it uses dependent on resolution.  To my knowledge that functionality
>>> has not been thoroughly tested (as it's an unpopular use case).
>>
>> OK, thanks.  I was hoping this was a hardware framegrabber; the info on
>> the website is so ambiguous as to be nearly useless.
>
> I think you're just confused about the terminology.  The term
> "framegrabber" inherently means that it's delivering raw video (as
> opposed to having onboard compression and providing MPEG or some other
> compressed format).  All framegrabbers are hardware framegrabbers.

Aha.  Thanks for the explanation.

>
> You may wish to look at the HVR-1950, which is well supported under
> Linux and does deliver MPEG video.  It's obviously more expensive that
> the USB Live 2 and it has a tuner which you probably don't need, but
> it does avoid the issue if you have USB bus constraints.

I had looked at the HVR-1950 but the power consumption was prohibitive for
my application.  :-(

--Yan

-- 
Pain is temporary. It may last a minute, or an hour, or a day, or a year,
but eventually it will subside and something else will take its place. If
I quit, however, it lasts forever.

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