Weird interlacing artifacts?

P

pwelander

Active member
I've been shooting with a 100b for a while now, mostly for work related interview shorts and such that get posted online. The works are edited either on FCP at work or FCE at home, sometimes moving from one to the other.

In two situations now I've gotten a strange interlacing effect. In a shot where there is a well defined vertical line, say someone's arm in front of a dark background, and that line moves horizontally, during the motion there's a smeary effect and the edge takes breaks into an interlaced squiggle. I don't know quite how to describe it beyond that. It doesn't appear everywhere or on every shot.

I'm shooting in 60i, plain old Scene File 1. Is there some setting that I have changed and I don't realize it? Is this a camera thing, or something odd that's going on in Final Cut?

While we're at it, for this type of online posting (YouTube) would it be better to shoot using 30p? 24p?

Thanks.
 
You're shooting interlaced video. That's why you see interlacing, especially if you are watching on a progressive monitor, such as a computer screen.

That said, if you're using squeeze while shooting 60i, it'll look much worse. And if your end-target is specifically the 'Net, then 30p or 24pA are the ways to go.
 
Definitely way better to use 30p or 24p for posting to the internet.

The squiggle you're referring to is probably an artifact of the 4:1:1 color sampling. Read the "color sampling" article for more information and to see if it fits what you're describing.
 
You can deinterlace by dropping every other field. You will lose vertical resolution, but at least your video will not have objectionable combing artifacts.
 
Shooting progressive is usually always better since you won't have interlacing to begin with and maintain as much resolution as possible.

You can deinterlace to 30p or to 24p with very good result using programs like DVFilm Maker or Jes Deinterlacer.

Best Regards,
Andy
 
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