About Video Interlacing From DVDs

Inuyasha666 · Post by **Inuyasha666** » Fri Nov 14, 2003 12:18 am

Is it really necessary to use what it says in the guides to get rid of interlacing in DVD footage if your saving your video to 352x240 resolution from 720x480 resolution? Cause I did it on my first video, and after I exported it from Premiere, the interlacing was completely gone. Yes, the video I made, was before reading the guides on here if your wondering. I'm just wondering because, is there something beneficial about deinterlacing it without doing that? And can you deinterlace the footage after you make the video in Premiere or is it something you should only do before u make the video?

Zarxrax · Post by **Zarxrax** » Fri Nov 14, 2003 12:27 am

If you make your vertical resolution 240, there will be no interlacing. However it is still to your advantage to perform IVTC, because you can achieve a smaller filesize with it.

Inuyasha666 · Post by **Inuyasha666** » Fri Nov 14, 2003 8:29 am

Zarxrax wrote:If you make your vertical resolution 240, there will be no interlacing. However it is still to your advantage to perform IVTC, because you can achieve a smaller filesize with it.

K. Thanx.

trythil · Post by **trythil** » Fri Nov 14, 2003 2:35 pm

Zarxrax wrote:If you make your vertical resolution 240, there will be no interlacing. However it is still to your advantage to perform IVTC, because you can achieve a smaller filesize with it.

One more advantage to IVTCing: Even if you halve the vertical resolution of telecined material without IVTCing, you will still have a duplicate frame from the telecine, which can make motion jerky.

Tab. · Post by **Tab.** » Fri Nov 14, 2003 3:31 pm

Plus if you just halve the resolution, you're either going to discard a field, which will be crappily sharp, or resample, which could mix up the fields in strange ways. Best thing to do even if you can't IVTC is use some adaptive deinterlacer before resizing.

JCD · Post by **JCD** » Sat Nov 15, 2003 6:30 pm

Minus you have 6 frames less per second that you can synch

ErMaC · Post by **ErMaC** » Sat Nov 15, 2003 7:05 pm

6 frames less that you can sync means very little. It you NEED those 6 extra frames because you HAVE to have cuts on all of them, you're a crack monkey or something and are making an epilepsy video.
If you're worried about not hitting that beat perfectly because there's no frame EXACTLY on the beat, face it - there isn't one exactly on the beat in 29.97 either, just very close. It's not noticable.
Shameless Rock Video was done in 24. Can you find any timing errors with that? Didn't think so.

DJ_Izumi · Post by **DJ_Izumi** » Sat Nov 15, 2003 7:36 pm

Ever notice that most of the animation in actual anime is only moving at like 10-15 frames per second anyway? The human eye is pretty stupid, it won't notice the difference between 30fps and 24fps...

Unless you do something drastic, crazy, or stupid in the process of IVCT.

Besides, arn't a large portion of the disks encoded progressivly at 24fps, and it's just the 3:2 pulldown interlacing it?

trythil · Post by **trythil** » Sat Nov 15, 2003 8:01 pm

DJ_Izumi wrote: Besides, arn't a large portion of the disks encoded progressivly at 24fps, and it's just the 3:2 pulldown interlacing it?

I wish. If this was the case, we'd have very little need for all these fancy inverse telecining / deinterlacing solutions, since then we could rip the VOBs and just work with the source material as-is.

Check out the Buena Vista releases of Ghibli films -- those are encoded progressively with the pulldown flag set. Final Fantasy: The Spirits Within is another such DVD.

trythil · Post by **trythil** » Sat Nov 15, 2003 8:03 pm

trythil wrote: I wish. If this was the case, we'd have very little need for all these fancy inverse telecining / deinterlacing solutions, since then we could rip the VOBs and just work with the source material as-is.

I take that back. TV shows would still most likely require deinterlacers.

However, there's really no reason why my copy of the Escaflowne movie (for example) should be telecined.