Crazy lines/blurring from capture

[neile]

When capturing, whenever something moves quickly on the picture, it seems to blurr and turn into lines (like in the picture below). Any ideas on how to fix this? I'm using a BT878 based card, and this happens even with audio turned off.



Please help!!

[xSpeCtor]

lol mate, you just need to deinterlace =)
search the forum (you can capture 1 field only to if you don't want to deinterlace)
hope i helped a little bit

[neile]

it does help, but how do I do that in virtualdub? thx

[xSpeCtor]

you can deinterlace with some virtual dub filters, but i prefer TMPGEnc to deinterlace, but that's if you're gonna make a mpeg....

[neile]

but isn't it too late once you've captured? i.e. those lines are permanently on the video? or is that the job of the deinterlace - to remove those lines? by the way... I've encoded it directly to DivX....



<font size=-1>[ This Message was edited by: neile on 2001-10-02 15:09:00 ]</font>

[Vejita-sama]

No, you capture then de-interlace. There are several ways to deinterlace. The easist being to capture at ???x240 (this only captures 1/2 the lines and thus one field). You sort of need to understand what interlacing is for this to make sense. Take a look at:

http://www.geocities.com/lukesvideo

Here's the short (less than 5 pages) background. Your TV only displays 29.97fps interlaced material. Interlace means that each frame is actually made of two fields (odd and even) that have 1/2 the lines to be displayed.

Film is shot at 23.976fps progessive. Progessive in that each frame is a complete picture. In order to show your 23.976fps progressive film on a 29.97fps interlace TV you have to convert your film to that format. This is known as telecine (aka 3:2 pulldown).

Ok, if you don't want to capture at ???x240 you first need to determine what your source is. If it's a 23.976fps progessive movie telecined to 29.97fps, then you can convert it back to it's orginal 23.976fps progessive source (which will deinterlace it) by a process known as inverse telecine (aka IVTC)

If it's a for TV source shot at 29.97fps interlace, then you'll have to either run a deinterlace filter OR make a SVCD (MPEG2 has support for interlaced material). If you plan to watch the film on your PC you'll have to deinterlace it, as there's no PC support for interlaced video.

Got it?

<font size=-1>[ This Message was edited by: Vejita-sama on 2001-10-11 17:24:50 ]</font>

[xSpeCtor]

great job Vejita-sama

[neile]

<TABLE BORDER=0 ALIGN=CENTER WIDTH=85%><TR><TD><font size=-1>Quote:</font><HR size=1 color=black></TD></TR><TR><TD><FONT SIZE=-1><BLOCKQUOTE>
On 2001-10-02 11:28:04, xSpeCtor wrote:
lol mate, you just need to deinterlace =)
search the forum (you can capture 1 field only to if you don't want to deinterlace)
hope i helped a little bit
</BLOCKQUOTE></FONT></TD></TR><TR><TD><HR size=1 color=black></TD></TR></TABLE>

How do I go about only capturing 1 field in VirtualDub at 640x480?

thanks!

[Vejita-sama]

To capture only one filed you have to capture at ???x240, this will only capture 1/2 the lines. The quaility hit is noticable but it does make life easier.

[neile]

Can I capture only 1/2 the lines at 640x480, because I want to capture 640x480 DivX to watch on my PC.