[mythtv-users] viaslice quality

[Ivor Hewitt]

On Saturday 21 February 2004 12:34, Darren wrote:
> I've been seeing this for a while now, I also am using DVB here in the
> UK.
>
Cool not just me then.

> If your in the UK, I find that BBC1 seems to perform correctly while
> ITV1 seems to exhibit this problem more often.
>
Hmm, I'll look into that a bit more tonight.

> How are you changing your output resolution, do you mean switching
> between widescreen and normal picture sizes?
>
By tweaking the code in the xfree driver mostly when I'm trying to get funny 
resolutions.
Oh re reading my email when I say "no problems" I meant I didn't see any 
problems that could be causing it.... not that there weren't any 
problems! :-)

> Darren
>
> On Sat, 2004-02-21 at 09:46, Ivor Hewitt wrote:
> > Just a quick question for those using viaslice output driver...
> >
> > Are you seeing 'chunky' mpeg output?
> >
> > I'm using a dvb-t card to supply an mpeg source stream but the playback
> > through viaslice is displaying, um, chunkyness.
> >
> > Hard to describe... the effect is quite subtle,  but the effect is like
> > there are vertical bars down the screen at eight pixel intervals.
> > almoset as if the Y shading across that patch is reversed. Quite
> > subtle, but most noticeable with light greys or greens.
> >
> > The effect is particularly noticeable on a 4:3 video being played back
> > in vertical letterboxed mode... if the image pans than there mpeg
> > corruption on the extreme edges of the screen as new colours move in.
> >
> > Initially I thought this may be some problem with scaling the image,
> > but throwing loads of debugging messages and using an output resolution
> > of 720x576, shows no problems.
> >
> > So, is anyone else seeing this?
> >
> > Regards,

-- 
Ivor Hewitt.
http://www.ivor.it - tech | http://www.ivor.org - hedge