non-interlaced and interlaced encoding question

[lenti_75]

what is the difference when you encode (mpeg2) a file in these 2 cases:

1. from non-interlaced to interlaced

2. from interlaced to non-interlaced

should you keep the original aspect, I mean, if the source is non-interlaced, then the encoded file should be non-interlaced and if the source is interlaced the encoded should be interlaced too ???

I know the difference between these 2, but when you try to encode from non-interlaced divx file, to dvd mpeg2 file, shoould you keep the same seeting ???

[migf1]

SVCD/DVD players are meant to playback interlaced video. VCD is meant to playback non-interlaced video.

On the source side, traditional sources (like TV, VHS, S-VHS, etc) feature interlaced video, while PCs and official movie film releases feature non-interlaced video.

Perosnally I only capture interlaced (since my primary source is the TV, which is interlaced), and leave it that way when I encode for SVCD/DVD.

For VCD, I've used a few variations:

1. Capture interlaced with VDub, but with "Line Reduction 2:1" enabled (usually using the Bilinear method). This results in a non-interlaced captured AVI.

2. Capture interlaced with VDub. Then open the captured AVI in VDub, resize the height from 576 to 288 (from 480 to 240 in NTSC) using the Lancos method, and frameserve it to TMPGEnc.

3. Capture interlaced with VDub, pass the AVi to TMPGEnc and enable its de-interlacing filter before telling it to encode the video.

4. Capture non-interlaced directly to the height of 288 (or 240, in NTSC).

Cases 1 and 2 give better results.

The reason most people use interlaced capture is because we don't know how exactly the capture-card behaves when set to capture non-interlaced video (they usually just ignore either the odd or the even field of the source, which might not always be the best case). Most of the same people also suggest to capture interlaced, then use avisynth to select only one field (selfield is called I think) and then pass it to the MPEG encoder.

Best regards,