Project deinterlace setting...

newUzer wrote on 5/15/2006, 7:08 AM
Hello,

Drop a DV clip on the timeline, and then step through it frame-by-frame. I see interlacing. Change the project settings, and I still see
interlacing. Use Mike Crash's Smart Deinterlace filter and all is cool. So, my question is: Do the project settings matter during preview, and if so, why aren't I seeing any effect of monkeying with the deinterlace settings?

Comments

Marco. wrote on 5/15/2006, 7:53 AM
If you want a interlace-free preview set the Field Order of your project setting to "None (progressive scan)" and the Deinterlace method to "Blend fields".

Marco
johnmeyer wrote on 5/15/2006, 8:18 AM
Don't change the interlace settings! It is normal to see interlacing on a progressive computer display. It means nothing. You have to check using an external TV monitor, which you connect through Firewire to your TV camera, and from there out to the TV monitor. Click on the external preview icon above the Vegas preview to enable the external monitor. Everything should look normal.

Interlacing is what you want if you are going to display on a normal TV as your final output device. Getting rid of it is not a good thing. While there are a few reasons to deinterlace video, they are not that common. More important, to do deinterlacing properly requires extremely complicated software and a fair amount of knowledge about what you are doing, or else you will end up with something that looks REALLY ugly.

newUzer wrote on 5/15/2006, 8:45 AM
Should I do anything if my intent is to render to a 24p DVD? I mean, if I mix some 24p AVI (an animation) stuff with DV footage from a consumer cam, should I do anything to the DV content? Under what circumstances should I use Mike Crash's filter?
johnmeyer wrote on 5/15/2006, 9:07 AM
If your material is already 24p, then deinterlacing is not needed. If your material is 29.97 NTSC interlaced DV AVI, then you render that using the DVD Architect NTSC template, which will create a 29.97 MPEG-2 file. Both these files can reside on your DVD. The DVD player will add 3:2 pulldown to the 24p if it plays it to an interlaced monitor.

There is a lot of misunderstanding about interlaced and progressive. Progressive is not "better" than interlaced; it is simply different.
farss wrote on 5/15/2006, 1:03 PM
To intercut 24p with 60i footage you need to first convert the 60i to 24p. You could work the other way around, apply pulldown to the 24p to get 60i however as your intent is to deliver 24p that'd be the wrong approach.
I've never done this, so be warned my advice could be wrong here. I think Magic Bullet will convert from 60i to 24p, run all the DV footage through that and then bring that into a 24p Vegas project.

The alternative is to render the 60i footage to 24p using Vegas, I'd use the smart de-interlacer to do this, just how well Vegas handles the 30fps to 24fps conversion I cannot say, others might be able to chime in here.

Bob.
johnmeyer wrote on 5/15/2006, 1:41 PM
Actually, you don't have to do anything special. Render each to its own format so that they are each in a different MPEG-2 file. Then, put those files into DVD Architect. It will add the 3:2 pulldown to the 24p section.
farss wrote on 5/15/2006, 1:58 PM
John,
this guy is trying to INTERCUT 60i and 24p I think.
Bob.
johnmeyer wrote on 5/15/2006, 3:35 PM
this guy is trying to INTERCUT 60i and 24p I think.

Oh ...
newUzer wrote on 5/15/2006, 3:42 PM
Yes, as you said farss, I'm intercutting or making a SINGLE mpeg for delivery on a 24p DVD using 60i and 24p content, so it seems to me I've got to turn the 60i stuff into 24p.

BTW: Just for my own information, is 60i really the same as 30i? If 24p means 24fps progressive, it seems to me 30i should mean 30fps interlaced, which necessarily means the video is composed of 60 interlaced FIELDS-per-second. Afterall, the "F" in fps refers to frames - right?
farss wrote on 5/15/2006, 4:30 PM
The conventions got changed a little while ago, so NTSC is now 30i, at least I think it is. If it was shot progressive it becomes 30PsF, i.e. 30fps = 30p but as the frames are split over fields it is denoted as 30PsF.

So yes the number should now always refer to the FRAME rate, just a tad confusing during the transition.

johnmeyer wrote on 5/15/2006, 4:52 PM
Maybe someone else who has done exactly what you are doing will chime in.

Key piece of information is what display technology will this be shown on, and how will the player be connected to it?

In the meantime, if you go from NTSC 29.97 interlaced (60i) down to 24p, I don't know how good that will look. By contrast, if you render your 24p to standard NTSC, Vegas will interleave the 24p into the 60i, and it should look exactly like film that has been telecined. While the "look" of 24p will be partially lost, you will not lose any temporal information. By contrast, when you go from 60i to 24p, you will lose temporal information.

newUzer wrote on 5/15/2006, 5:12 PM
I didn't think what I was going to show it on should matter as I was under the impression a DVD player (or software player for that matter) should handle the conversion from 24p to 30i automatically. I believe this because most DVDs I've rented are 24p and they look just fine. I want to use 24p because I believe I can fit more on a given DVD.
johnmeyer wrote on 5/15/2006, 6:42 PM
I believe this because most DVDs I've rented are 24p and they look just fine. I want to use 24p because I believe I can fit more on a given DVD.

Yes, that's true, but they have the 3:2 pulldown flag set so that pulldown can be performed by the player before sending the video to a 29.97 fps interlaced NTSC monitor, hence my statement about needing to know what it is going to be played on.

Go ahead and change your 29.97 interlaced to 24p, but I don't expect it will look very good. But, maybe I'm wrong ... you'll soon find out.
newUzer wrote on 5/16/2006, 3:55 AM
I guess that begs the next 2 questions: Will Vegas set the pulldown flag when I render to a 24p DVD and then author with DVDA, and if so, how do I prove it?