[mythtv] Another Unichrome/XvMC VLD question

Terry Barnaby terry1 at beam.ltd.uk
Sun Nov 21 19:49:24 UTC 2004

Steven wrote:
> Hi,
> Capturing and playing back PAL 720x576 MPEG2 recordings.
> Using current CVS code.
> If I enable hardware decoding on my EPIA M1000 the deinterlace code
> seems to invert the odd and even frames. A least that's what I think is
> happening. Newstickers and pan shots seem to bob left and right.
> If I disable interlacing newstickers and pan's don't look smooth.
> Any idea on how to debug this? Could it have something to do with via or
> unichrome mpeg decoder lib versions? (They are both CVS from mid
> october)
> This is a small snippet from my XFree log: 
> (II) Loading /usr/X11R6/lib/modules/drivers/via_drv.o
> (II) Module via: vendor="The XFree86 Project"
>         compiled for, module version = 4.1.30
>         Module class: XFree86 Video Driver
>         ABI class: XFree86 Video Driver, version 0.7
> Steven
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Hi Steven,

This could be the problem I have. If so it is an issue with 
synchronising MPEG2 frame writes at 25Hz to the TVoutput chips
25Hz frames. I find it can be in-sync or out of sync.

See my notes on (Curruent status): 

At the moment I do not know of a way to fix this, it seems to
be a hardware oversight ....

   Dr Terry Barnaby                     BEAM Ltd
   Phone: +44 1454 324512               Northavon Business Center, Dean Rd
   Fax:   +44 1454 313172               Yate, Bristol, BS37 5NH, UK
   Email: terry at beam.ltd.uk             Web: www.beam.ltd.uk
   BEAM for: Visually Impaired X-Terminals, Parallel Processing, 
Software Dev
                          "Tandems are twice the fun !"

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