SVCD and deinterlacing

[Poplar]

I am trying to convert a NTSC interlaced DVD to SVCD with CCE. The question is, is it necessary to do deinterlacing? I read from somewhere else that as a rule do not do deinterlacing when you are encoding MPEG2. But that guy (who is German) didn't make it very clear. I guessed the his reasons were:

a) deinterlacing requires higher bitrates (20% higher)
b) your TV will play it interlaced anyway

Is it any truth to these statements? Sefy's SVCD guide doesn't mention deinterlacing either. Could those of you with more experience offer some insight on this?

[dphirschler]

Deinterlacing is not necessary because SVCD mpeg-2 can do interlacing. However, I prefer to do it. Actually, I prefer to inverse telecine it to get the progressive frames. Try the AVIsynth 'Decomb' filter. Quite amazing. But if I could not inverse telecine, then I would just go interlaced. De-interlaced always looks too blurry to me. But that's just me.


Darryl

[Sulik]

Actually, a) is the opposite: capturing interlaced requires 20% more bits to encode. This is mostly because there is much more high-frequency content in the image (harder to compress).

Deinterlacing makes compression easier, and allows you to do inverse telecine, which saves you an additional 20% bitrate.

The only reason why you would want to capture interlaced is if you want to watch it on a TV (display is interlaced anyway), and you have enough bitrate (6+Mbps).