interlaced or not?

[RangerXXX]

I just got an Canopus ADVC-100 and burn with a dru500ax. I want to watch the video I capture on a TV and i've read everyone say not to deinterlace, but when I don't deinterlace the fast part of the video seems jerky. I've tried reversing fields and tested at least 20 or 30 test burns with diferent filters and stuff. I use Virtual Dub then frame serve into TMPGEnc Plus. Are there certain settings I should use to not make the video jerky in the fast motion parts?

[txpharoah]

What authoring app?

[Vejita-sama]

You need to understand what interlacing is and how it works (do a forum search or read the guides at doom9.org, google search might work too). Here's a short overview.

When TV was invented we didn't have a have to broadcast images at a high enough framerate for smooth/fluid motion. Someone came up with the idea of sending all the evens lines, then all the odd lines, for each frame at a time. To the human eye (and because the of the TV tube) it appears as one image.

So each frame is actually made of two fields: even and odd (lines) aka top and bottom. For a normally 720x480 broadcast each frame is field at 240 lines, that is if you capture at ???x240 you automatically de-interlace because you only capture one field (before be jump me on that one, I said this is an overview )

To try to de-interlace a 29.97fps true interlace source will only degrade the quaility of your video (either remove 1 field or try to merge/force the two together).

You want to capture both fields to maintain picture quaility so ???x480 (720x480 or 352x480) is best. You 'should not' see interlaced artifacts on your TV (only on your PC).

Normally when they appear it because someone either encoded to MPEG1 (only MPEG2 supportes interlaced source), or they choose the wrong field first when encoding to MPEG2.

1) So the question becomes are these 'jerky' scence on your PC or when played on your TV?

2) What settings did you use to capture?

3) And as xpharoah asked how did you encode and author the video?

[RangerXXX]

I'm using IfoEdit to author. The video is jerky on the TV after I burn a DVD. I capture to DV avi then encode to mpeg 2 with TMPGEnc Plus.

[txpharoah]

Not sure I can help you. Some authoring apps, as it has been reported to me, and even experienced first-hand, will not allow the interlace to function properly beyond after authoring. I'm not sure why, but it happens. Try another authoring app.

[RangerXXX]

Can you recommend a good authoring program?

[nick1977]

Haven't used tmpgenc plus myself - still using an older version - but I have the option to change the field order. It's either top field first (A) or bottom field first (B).
Since the field order can vary, I encode a short clip and burn to CD-RW to test, and then proceed to encode the whole thing for DVD.

Hope this helps

Nick

[racer-x]

If you capture DV through 1394 Firewire, it is always Lower Field first (bottom,B). If you use a capture card then it go either way, but usually Top Field first (A).

That goes for TMPGEnc or Premiere.

If you use Ulead, then the opposite applies. Don't ask why, I can't figure it out either.

[tygrus2000]

Your TV was generally designed for an interlaced signal, however, many people experience interlace artifacts or interlace flicker when they try to re-encode a source that way.

Actually, I would suggest trying a full deinterlace of your source first using Vdub or something like that, then encode with TMPGEnc to full progressive (non-interlace). This might blend the fileds well enough so that you wont have artifact or flicker problems.

Unfortunately, this is one of the major problems people are stil having and a solution is needed.

[txpharoah]

Your TV was generally designed for an interlaced signal, however, many people experience interlace artifacts or interlace flicker when they try to re-encode a source that way. ..Actually, I would suggest trying a full deinterlace of your source first using Vdub or something like that, then encode with TMPGEnc to full progressive (non-interlace). This might blend the fileds well enough so that you wont have artifact or flicker problems.....Unfortunately, this is one of the major problems people are stil having and a solution is needed.

The only problem is encoding with field order in the wrong order. The re-encode should match source. NEVER deinterlace interlaced source. Doing so loses quality.