scrolling lines in capture

[jbarman]

I originally posted this in conversion, but noticed last night that the lines appear in the captured AVI, too. Please help, if you can. =)

I'm converting some star trek episodes to SVCD. I capture at 720x480 HUFFYUV, using Radeon AIW. Source is Dishnetwork via SVHS. I frameserve to CCE 2.5 using avisynth doing a bilinear resize to 480x480. No other filters, other than noise reduction of 6 in CCE. My SVCD is plaugued by these really annoying scrolling horizontal lines that slowly scroll up the screen. Does anybody know what is causing this, or how I can get rid or/avoid it?

Thanks much!

[stanwebber]

what capture software are you using? if virtualdub or avi_io i'm not surprised....the microsoft wdmvfw mapper is buggy as hell for captures over ?x240

[jbarman]

it's avi_io, but under XP...sorry...forgot to mention that. It was my understanding that with XP and the latest version of avi_io that there was no mapper, but wdm was supported directly with the radeon AIW.

[stanwebber]

there are no vfw drivers for the ati radeon regardless of os. try iuvcr(see tools section left) or stick with the ati mmc

[jwhitlow]

<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 2001-11-20 12:06:39, jbarman wrote:
My SVCD is plaugued by these really annoying scrolling horizontal lines that slowly scroll up the screen. Does anybody know what is causing this, or how I can get rid or/avoid it?
</BLOCKQUOTE></FONT></TD></TR><TR><TD><HR size=1 color=black></TD></TR></TABLE>

Do your bars looking like (or remotely similar to) these:

http://www.epanorama.net/documents/groundloop/video_isolation.html

If so, you are probably suffering from a ground loop. You can get a coaxial ground loop isolator or just disconnect the incoming coaxial cable from your VCR when you want to capture. If you choose the former, check here:

http://www.jensen-transformers.com/datashts/vr1ff.pdf

[jbarman]

Yep...they look just like that, but not as severe. I can't disconnect the coax from the VCR, as I am capturing directly from a Dish Network receiver. Might playing around with which outlets everything is plugged into help?

[jwhitlow]

I do not want to mislead you by professing to be an expert with ground loops and hum bars. I am not.
You might want to do some research on the web and the usenet. Here are some links to get started with:

http://www.hometheatervillage.com/village.library/hum/tech_bulletins.html
http://www.vac-brick.com/1994grnd.html
http://www.sierravideo.com/support/faqs.html#noisebars

[jbarman]

Thanks. I will take a look. =)