Keep interlaced and resize vertically, good idea?

[Slogra]

Ok, i've got a 29,97 fps interlaced DVD here and anamorphic. It's an anime (.hack) and it seems that it needs a lot of bitrate to look good.

I've already encoded it as an interlaced anamorphic SVCD, but i'm not really satisfied about the quality.
I've also tried deinterlacing it by VerticalReduceBy2(PAL) and adding borders. I hoped i got less mpeg atrifacts this way, but unfortunately the quality hasn't gotten much better :/. So deinterlacing doesn't seem to help getting better quality, but looks quite a bid blurrier. So i guess it's better to keep it interlaced afterall as it will have a sharper image.

Now i want to try to keep it interlaced and add borders but i'm not sure if this is a good idea as it will probably screw up when the video is resized vertically while it is interlaced. What do you think?

[Kika]

Sure about the 29.97 FpS? Have you tried Telecide (inverse 3:2-Pulldown) to get 23.976 FpS progressive?

[Slogra]

Originally posted by Kika
Sure about the 29.97 FpS? Have you tried Telecide (inverse 3:2-Pulldown) to get 23.976 FpS progressive?

Actually, not really. I'm more of a PAl kinda guy :D , so i don't have large experience with telecide. I'll check it out. Thx.

[Slogra]

How do i know if an MPEG is encoded as 24fps? WinDVD seems to show 29,97 fps at the info all the time...

[Wilbert]

If you are a pal-guy you should know what telecide is :) Kika means teleciNe, and what he really means is inverse telecine. Anyway checkout: http://forum.doom9.org/showthread.php?s=&threadid=34696

If your source is telecined (two out of every five frames are interlaced), try inverse telecine. Otherwise your source is trully interlace, and you should use FieldDeinterlace().

Oh, I see that your source is anime. So, it could also be hybrid stuff ...

[Slogra]

I know what IVTC is, but i'm not really sure how it works in DVD2SVCD. So i've been trying some random stuff untill i found the best quality. At the DVD2AVI tab, IVTC seems to give best output quality (but it's also the slowest). Force On gave me interlaced lines, so this couold either mean that he dvd is Hybrid or that the output is still interlaced, im not sure.

Unfortunately I screwed up my last post. What i meant to say is this: How do i know the output SVCD is 23,97 fps or 29,97fps? WinDVD always indicates 29,97fps with all my experiments.

[manono]

hi Slogra-

I haven't worked with .Hack, but most anime can be IVTC'd. Nowadays a lot of them have 29.97fps passages, but I usually ignore it. In any event, you can find out easily enough if it's really 23.976fps. Take the .d2v that DVD2SVCD made for you (with no Force Film) and open it in GKnot (you have that installed?). Then find a place where there's movement and start advancing frame by frame. If you see 2 out of every 5 frames interlaced (as Wilbert said), it has been telecined and can be IVTC'd. But if all the frames are interlaced, it can only be deinterlaced. You want to bring it back to 23.976fps if possible, because of the better quality you'll get from encoding 20% fewer frames.

How do i know the output SVCD is 23,97 fps or 29,97fps? WinDVD always indicates 29,97fps with all my experiments.

The only sure way to tell what the source is, is to look at the frames. But all NTSC DVDs and SVCDs put out 29.97fps because of the flags that get set during pulldown telling the player how to output 29.97fps.

[Slogra]

Originally posted by manono

In any event, you can find out easily enough if it's really 23.976fps. Take the .d2v that DVD2SVCD made for you (with no Force Film) and open it in GKnot (you have that installed?). Then find a place where there's movement and start advancing frame by frame. If you see 2 out of every 5 frames interlaced (as Wilbert said), it has been telecined and can be IVTC'd.

Thx, now i'm sure it's telecined. It is weird that Force film On on the DVD2AVI tab doesn't work, isn't it? The Video Type % in DVD2AVI fluctuates very much, so i guess that is the cause of all the trouble.

btw. I checked out BBmpeg while it was doing its thing and i saw that Pulldown was detected, so the output MPEG is 23,97fps for sure too.

I think my SVCD is perfect now :)