[mythtv-users] Tearing in playback

[Stephen Williams]

You don't state what your video card is, but I had a similar problem
using an MX440 with a VGA -> SCART adaptor.

The MX440 has two video out ports (I was using one to my TV thought
the VGA -> SCART and one to a standard monitor), it tunrs out the
refresh of the two displays were not in sync (even though they could
be, both were are at 50Hz) and the driver arbitrarily chose which
refresh signal to report back to X / Myth / Xine / whatever else might
be interested. It just happened that Myth was syncing to the monitor
refresh and not the TV refresh, thereby tearing the image on the TV.

If you have a similar setup then try disabling all over video outputs
except the TV and see if that fixes things. If not, then try running
Myth with verbose messages enabled and see which sync method it's
actually using. If you don't have an Nvidia card then you probably
want to make sure you're using the OpenGL sync method.

Steve


On Thu, 6 Jan 2005 17:30:19 +1100, William Uther
<willu.mailingLists at cse.unsw.edu.au> wrote:
> Hi,
>    I'm using a DVB-T capture card - MPEG2 input.  I'm using a VGA->SCART
> adaptor cable to display the video.  (I've finally managed to get Xv to
> work with interlaced output so this is running at reasonable speed
> now.)
> 
>    I'm getting tearing of the image during playback.  Myth should be
> syncing the frame update to occur during the vertical refresh, right?
> Does anyone know how this is supposed to happen, and how I figure out
> why it isn't happening?
> 
> Thanks,
> 
> Will       :-}
> 
> --
> Dr William Uther                            National ICT Australia
> Phone: +61 2 9385 6357             School of Computer Science and
> Engineering
> Email: willu at cse.unsw.edu.au             University of New South Wales
> Web: http://www.cse.unsw.edu.au/~willu/        Sydney, Australia
> 
> 
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