Horizontal lines in moving objects when going VOB -> .AVI

[jmusd]

I am trying to convert a VOB to AVI(mencoder). It is a NTSC black and white film. I have tried converting it at 24 even though it says 29.97 in the info. These horizontal lines appear in objects like faces when they are moving. They appear only in the object like the face not all the way across the screen. I have tried using forty-two DVD VX and it does not produce any lines? I thought they both were using mencoder. The only thing that seemed different about the forty-two VX file was that it was 29.97 not 24. When I tried 29.97 with ffmpegx the lines seemed even worse.
Anyone know why this might be happening?

Thanks

[Craig Tucker]

Interlacing ?

http://www.lukesvideo.com

[jmusd]

Well I tried encoding with deinterlacing checked and the lines were gone. I encoded the clip in 24 and 29.97. Both worked, however 29.97 seemed to run smoother, not as jerky in the movements. But now I am left with some questions. Why did this need to be deinterlaced when I know for a fact that it was shot in film? Also what framerate should I be encoding in? I thought for film it was 24? But it seems to look smoother in 29.97 and other apps like forty-two VX and DVDibbler encoded this file at 29.97.

Thanks

[andkiich]

Read up on interlace/de-interlace.

At resolutions higher than VCD, the video will be interlaced. Your TV knows how to combine the 2 frames it gets making the appearance of a solid video. The PC DVD players do the same.

Once the file is converted from a VOB to anything else, the computer media players and such "plays it as it sees it" so to speak, and you get interlace lines.

If you created the AVI to play on the PC, then de-interlace is what you will want to do, if your going to modify the file and then re-author to DVD, you can leave the video alone and not de-interlace.

[jmusd]

First off thanks for the replies. I am trying to understand this...So any file I convert that I want to watch on my TV and Computer I should deinterlace, no matter if the source is film or video? And how do I know if I should convert it at 24 or 29.97?

Thanks

[jmusd]

Could someonoe please answer this question for me. So any DVD I encode at 640 width should be deinterlaced, no matter if the source is film or video?

Thanks

[major]

If the source is not interlaced, then you should not deinterlace it.