Posted by Jukka Aho on 09/23/06 23:19

Riaan Eloff wrote:

> Could someone please advise?
>
> DVD image "sudders" or "shakes" whenever there is some fast motion on
> the screen. This happens when I author directly from avi.

Sounds like something that could have been caused by wrong field order.
Check your authoring program - or the MPEG-2 encoder program, if you use
an external one - for field order settings.

It could also be caused by careless resizing of interlaced material.
Never resize interlaced material unless you know exactly what you're
doing.

> Also, when I view my edited and completed avi BEFORE authoring, it
> shows fine in Premiere, but in Windows Media Player it shows
> lines/stripes over faster motion parts. Almost like the image is cut
> into hundreds of lines, and only some of them move.

You would probably like to read up on interlacing:

<http://lurkertech.com/lg/fields/fields.html>
<http://www.100fps.com/>

* * *

Even though you might be tempted to deinterlace the material (and there
are actually some misguided web pages out there that recommend this as a
"magic bullet" type of generic solution for all interlacing-related
problems) this is not a good idea. If your source material is interlaced
video, and if it is going to end up on a DVD - which is a medium that,
when properly authored, can retain interlaced video and play it back
flawlessly - you should keep your video interlaced. It's not the
interlace itself that is at fault here - it's some misadjusted setting
in one of the programs you're currently using.

--
znark

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