strange horizontal movement when capturing

[fzwart]

Hi,

When I capture from VHS or Video 8 (PAL) during horizontal movements it looks like the pixels are moving 2 steps to the right, 1 step back to the left, 2 steps to the right, 1 back to the left, etcetera.

Capturing card is Hauppage WinTV GO
System is Athlon 1700, Aopen AX73 mobo
OS is Win XP
driver is the latest from http://btwincap.sourceforge.net/
capturing software: Virtualdub, freeVCR

I had the same problem with the Hauppage drivers

[Mavrick]

TV’s use an interlaced signal, and computer monitors use a non-interlaced one. When you view a interlaced video on a PC monitor, the video will look like it has lines or jagged edges, especially during fast movement.

This is normal and the same video will look fine on a TV, provided you encode to MPEG with the right field order first… typically field order B first…

Interlacing is how a TV “draws” the image on the screen. It will “draw” every other line from top to bottom first. Then go back and “draw” the lines it didn’t during the first path.
The lines that draws on the second pass have to be out-of-sync with the first ones (due to movement of the video) in order to look right.

Non-interlaced is how a PC Monitor “draws” the image on the screen. It will “draw” each line from top to bottom.