Anyone care to comment? I'd like to hear your views.


thanks

1clue3

How do you mean? Deinterlacing for output to the web is a must.

Deinterlacing in your editing app will throw out the second field giving the image a "film look". (Video is 60 fields per second. 2 fields make up a frame)

You do loose some resolution when you deinterlace. It simply doubles one of the fields so the information that was in the second field is lost.

On Avid DS one must deinterlace the footage then reinterlace to properly use some effects. With this process you do not loose any resolution.

-Chris

Alright thanks man. Well I use Premiere and AE, and you say that I should deinterlace after the whole prject is done?

1clue3

If you are outputting for the web the video you export should be deinterlaced, not necessarily the video in your editing system.

How about if the final destination is for DVD.

1clue3

Then you definitely do not want to deinterlace since DVD is a video format played back on your TV.

Computer monitors are progressive while a TV monitor is interlaced meaning that there are 2 fields per frame.

On a computer monitor, exported video that hasn't been deinterlaced would have banded lines in the image, especially during motion. This is because it is displaying both fields at once.

Most apps should have a "deinterlace" option when you export QTs.

As a general rule:

Deinterlace on export for web or CD-ROM. (Anything that will be viewed on a computer monitor)

I think Chris is right in regards to things shot on NTSC video but I beleive DVD players have sort of automatic 3:2 pull down converters so many DVD's are actually 24p versions captured from the original film. I don't think your home DVDr is capable of making DVDs in this fashion though.

Good luck!

I have heard of that yes.

What he means is that the film on the DVD is at 24p (24 progressive frames like film) and then the DVD player does a 3:2 pulldown (converts the 24 progressive frames to 60 fields) so that it can be displayed on a standard NTSC monitor.

I'm pretty sure it is stored this way to make it HD 24p compatible.

But then again if you are making a DVD on your home system this is a moot point. I'm not sure any DVD burning programs out there can do it. But I could be wrong.

Of course this only applies if your film was shot of film.

Just found a site that explains the whole interlaced/deinterlaced thing in more detail:

http://www.aluminumstudios.com/digitalvideo/advanced/interlaced/interlaced.html

Okay, sounds good, thanks, and Ill have a look.

1clue3

It's been my experience that as long as you get the bitrate and resolution right, it doesn't matter whether you feed in interlaced or progressive scan video into a DVD project.

However, if you DO make it interlaced, it gives dvd rippers more of a headache if they try to pirate your film!

Personally, if you've shot with progressive scan or something simillar to Canon XL1's "frame" mode, stick with progressive all the way, Same for interlace. Don't mix and match.

That should keep your picture quality up.

Richard.