On Thu, 22 Jan 2004, [ISO-8859-1] Thomas Börkel wrote:
> Bernhard Praschinger wrote:
> >
> >>I can see light vertical stripes in bright scenes in my encoded result.
> >
> > How large is the stripe ?
> > Do you scale (guessed from the -Z option) the picture ?
> > If yes does it also happen when you don't scale it ?
> > That it would be from scaling.
>
> You are right! It is from scaling. But why? When I scale the unscaled
> test while playing in xine, then I do not have that effect.
I seem to recall transcode's -Z scaling causing problems for someone
else in the past.
A (much) better way to perform scaling is to use 'y4mscaler'. You can
find y4mscaler at http://www.mir.com/DMG/
You also mentioned in an earlier mail item:
"If I use -q 2 or -q 3, I get pulsating (every second or so) block
artifacts in the background, which I get not with -q 4."
I wonder if those artifacts are also due to the scaling.
y4mscaler works on YUV4MPEG2 streams which I believe transcode can
create. If you can find a way to get "Y4M" output (without scaling)
from transcode you can use y4mscaler - something like this
y4mscaler -S option=sinc:8 ...
will perform very high quality scaling and I think the artifacts will
disappear.
Cheers,
Steven Schultz
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