[mythtv-users] IVTV 0.8.1 and PVR 500 with new Samsung tuners

[John Drescher]

On 11/29/06, Roland Roberts <roland at astrofoto.org> wrote:
>
> I missed the original post, but...
>
> I've have my PVR-500 for about a year, and since the upgrade to ivtv
> 0.80, I've had problems.  0.81 is no different.  I have several channels
> which are problematic.  At some points it acts very much like the mpeg
> encoder/decoder is "confused" and image blocks get all jumbled.  Then it
> will suddenly settle down and work again for a while.  This happens both
> when watching live TV and when recording.
>

This sounds like a dma problem and not the same problem as I am having with
the prv500.
Actually, I had a similar dma problem with my pvr250 which I have connected
to an older
dual processor athlon mp 2400. To solve my issue I patched ivtv to not use
dma. Look at the
source code for PIO.  It works flawlessly but takes 25% of one cpu while
recording. I did this
patch a long time ago, as I am using a 2.6.13 kernel on that box which is my
master backend
and I record several hours a day as I have > 600 GB of recorded shows at the
moment and
90%+ of this is with the pvr250.

John
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