Framerates when filming a television

D

directedition

Member
Hello,

I'm shooting a film on film which includes a number of shots of a television screen. The guy I'm working with thinks we could just film a blank screen and do aftereffects magic to apply the video in post. I think this is total BS, and want to film an actual TV screen.

I've read up a bit on filming monitors, but there are a couple issues that I have yet to resolve. My reading material tells me that for NTSC video, you need to shoot at 144 degrees to eliminate the scrollbar. But the good ol' Eclair NPR we're using only does 5 degree increments, so the closest would be 145. Would that be a noticeable difference? I think it's important that this shot be seemless and not have any scrollbar artifacts.

Also, is there any rule for what the source video should be filmed as? I mean, will 60i translate well to film without a ton of interlacing garbage? Or should I shoot my video segments at 24p? Does it really matter?

Thanks a ton for your input!
- Jim
 
Well, you don't say what camera you're using, but the DVX100 has a setting called "synchro scan" that lets you shoot a TV screen or computer monitor without any of those annoying scrolling artifacts. It takes a little while to lock on what what synchro scan setting to use, but once you do find the right one, it's totally awesome. :)
 
145 degrees will be close enough, but even with 144 you're not going to get it absolutely perfect; at 144 degrees the scroll bar shouldn't move (if your frame rate is 23.976, not 24.000) but you may still see a stationary scroll bar.

If you can, get rid of the tube TV and use a flatscreen instead; a plasma or LCD shouldn't have any flickering effects or scroll bars regardless of your shutter speed... I think... actually, I haven't tried that so I may be talking out my hat but I think it would work.
 
LCD Monitors dont have that problem, I just tested that. and it isnt frame rate you need to adjsut, its shutter speed.
 
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