[mythtv-users] viaslice quality

Darren djsharman at ntlworld.com
Sat Feb 21 07:34:33 EST 2004


I've been seeing this for a while now, I also am using DVB here in the

If your in the UK, I find that BBC1 seems to perform correctly while
ITV1 seems to exhibit this problem more often.

How are you changing your output resolution, do you mean switching
between widescreen and normal picture sizes?



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,

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