Several Questions

[Shaw]

Hey guys:

I wasn't sure where to put this post as I have numerous questions and they all go off in (semi) different directions.

To start:

Barry, I was recently checking out the DVD that came with the DVX book (great DVD btw) and I noticed, when playing the footage on my TV that I could see interlaced artifacts on the slow pan (24p and Strobing section). I naturally assumed that this is due to the interlaced nature of the TV but I was recently watching some other DVDs and I cannot pick up on the same sort of artifacts. I also noticed this effect during the slow motion footage. Any ideas why this is so?

On a similar note: how do computer monitors display interlaced footage?

Is it possible to make a 30p DVD or do I have to use 60i? How does this playback on a computer monitor?

 

[Barry_Green]

Re: Several Questions

I spent a whole chapter in the book discussing why you'll see interlace artifacts on progressive footage. It most definitely happens in film as well, but you only usually notice it on high-contrast edges (i.e., a white picket fence, or maybe a dark doorframe against a white wall).

 

[Shaw]

Re: Several Questions

It most definitely happens in film as well, but you only usually notice it on high-contrast edges

Ah that might explain it! I read the chapter in your book but I was still uncertain why I was seeing interlaced artifacts in the DVX footage and not the film I was watching. High contrast edges makes quite a bit of sense. Thanks!

 

[Barry_Green]

Re: Several Questions

The most glaring example I can think of was in the movie "Network" -- you'll see more comb artifacts and strobing in that picture than you'll ever see in a first-time-DVX'er movie (and it was nominated for an Academy Award for Cinematography, so you know they knew how to shoot!) There are several scenes with fast panning down a hallway, past doorframes, and you can really see the comb edging and the strobing is overwhelming at times.