video quality problem

[Gildas Bazin]

On Thu, 8 Nov 2001 <airpenny3 at dggen.com> wrote:
>
>Hi. I have a big problem(?).
>
>I have played dvd on 2 application programs. One is a POWERDVD and the other is a VideoLan Client on Windows 2000.
>When there is big motion for example running man or moving hands quickly, display window shows strange lines and the diagonal lines like the border which appear between hand and window looks like not straight line but zigzag line. When playing dvd, please watch carefully or if you want to watch easily, pause the stream.
>I have played videolan on both windows and linux. So I think that the problem may not be on video output plug-in but be on before the video output plug-in, because window videolan uses directx and linux videolan uses x11 and xvideo for video output plug-in.
>Please watch carefully and please tell the cause of problem.
>Thanks everybody.
>

The problem you are describing is "not really" a problem. It´s just that some DVDs haven´t been designed to be displayed on computer screens (which uses a progessive scan technology to display the image) but they have been designed for TV screens (which uses a interlaced scan technology).
For an in-depth explanation on this you can go to (http://www.digital-digest.com/nickyguides/interlace.htm)

PowerDVD uses some tricks to reduce this interlacing effect but the VideoLan client doesn´t yet. This is why you get a better quality with PowerDVD. There has been some discussion a few months ago about implementing one, but nobody has done it yet.

Regards,

--
Gildas

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