odd video artifact during capture

[youbecha]

If I use the Ulead VideoStudio5 that came with my card I get this series of frames.
http://home.sw.rr.com/bubbazanetti/video/ulead1.jpg
http://home.sw.rr.com/bubbazanetti/video/ulead2.jpg
http://home.sw.rr.com/bubbazanetti/video/ulead3.jpg

If I use any other capture software then I get this series of frames.
http://home.sw.rr.com/bubbazanetti/video/frame1.jpg
http://home.sw.rr.com/bubbazanetti/video/frame2.jpg
http://home.sw.rr.com/bubbazanetti/video/frame3.jpg

Why am I getting that in between frame?

The card is a Gainward Geforce2 Ti500 Golden Sample VIVO...apparently it uses onboard mpeg encoding.

and along that line of thinking...what codec or software will utilize that property...

If you wonder why I don't use the Ulead product, well it will only save 4gig files...about 30 minutes worth of video...good for some things...but not everything.

[lgh529]

This looks to me like an interlaced from where there was some quick motion between fields. (1 field is half a frame, every other line; 2 fields = 1 frame). If there is quick motion between each field, then the second field doesn't match the first.

I would not capture using Ulead because the mpeg encoding isn't as good as TMPGEnc. In fact, its kind of lousy.

What other software are you using to capture?

Best is to capture to AVI then encode to MPEG later. Quailty will be much better, although the file sizes are larger. If you have the 4GB file limitation, use Scenealyzer (look in tools section of this web site). I have sucessfully captured over two hours of video to AVI without any problem. I suppose I could go longer as well, but haven't need to yet.

Maybe some of the other experts can correct me.

[Vejita-sama]

Yeah that's interlacing. It's a normal part of NTSC video. Long story short each TV frame is actually made of two fields. One field has all the odd lines in the frame and the other field has all the even lines in the frame.

Each frame is shown one after the other, and again long story short, to create a fluid picture. So TV actually shows 60 feilds per sec (not 30 frames per sec).

There are several ways to work with this. Looks like you are capturing animation (PowerPuff Girls?).

1) If encoding to MPEG2 do nothing. MPEG2 supports interlaced source. So while it'll look strange on the PC it'll play fine on your TV

2) Capture at ???x240. That only captures one field (eg. 352x240) (capturing at ???x480 gets both fields, eg. 352x480 or 720x480).

3) Deinterlace (only it you plan to convert to MPEG1 or DivX).

Do a forum search on interlacing, deinterlacing, teleciding and/or fields for more info.

[txpharoah]

Some info on interlace in the guide in my signature.

[youbecha]

Thanks for the replies...

The ulead product that came with the card and captures to mpeg is the only one that DOESN'T give that 'interlace' problem.


So apparently the capture is out of sync with the input...what setting should I be useing.

(I am not capturing Power Puff Girls, that just happened to give a good demo...I am capturing old B&W Popeye cartoons.)

[Nelson37]

It is important to understand that the interlacing is NOT a "problem" or defect in any way. This is what it is SUPPOSED to look like. It appears that the Ulead capture is either de-interlacing on the fly, or simply throwing away one-half of the field info. It also appears to be an MPEG capture, where the second is an AVI.

Do some searching on Interlacing and Inverse Telecine for an explanation on why this effect is there, why it should be, and why it is not a factor for TV display and IS a factor for PC display. Concentrate also on IVTC for the best 20% improvement in quality for no increase in filesize.

[youbecha]

I understand that Interlace is the standard analog TV display...What I meant was how do I not get this in my captures.


The only place I have seen selections for Deinterlace, Inverse Telescine, etc is with windows media encoder.

I thought Telescine converted the 24fps movie to 29fps video?...does that apply to my captures not interlacing the interlace frames?