Best frame rate for greenscreen? at DVinfo.net

Bruce S. Yarock · May 21st, 2010, 04:38 AM

I'm shooting some green screen footage this afternoon and was wondering if I should use the 720 60i setting instead of 24 or 30. I know it's a little late to ask, but if anyone can answer this am, that would be great.
Thanks
Bruce Yarock

Tim Kolb · May 21st, 2010, 09:35 AM

What's the delivery framerate?

shooting at the delivery framerate, but progressive scan is fairly typical method.

If you're delivering at 720p, I'd still try to shoot 1080 if you are delivering at 29.97fps or less (1080p59.94 is not widely available as a recording format of course)...more spatial resolution won't hurt. Upping the framerate won't help nearly as much as increasing the frame size.

In general, I'm not sure I'd shoot green screen on a DSLR...pretty compressed stuff there. Others have probably had more experience with it though, and if you can key HDV (and I have), H.264 is likely manageable.

Better yet, an external recorder like a KiPro, or a Flash Nano would help make post a bit easier...

So...there are some thoughts to start...

Bill Pryor · May 21st, 2010, 09:50 AM

I shoot everything at 24 fps. No problems at all with greenscreen. Chroma keying is fine with the 7D, assuming you light it right and have decent keying software.

Tim Kolb · May 21st, 2010, 09:57 AM

Quote:

Originally Posted by Bill Pryor

Chroma keying is fine with the 7D, assuming you light it right and have decent keying software.

Well, there you go... You can pretty much insert any camera you like into that statement, and the lighting and keying capability are still always the key.

I'm hoping to be a 7D newbie shortly. Then I'll have to really run some of these scenarios so I have some first hand experience.

Chuck Spaulding · May 21st, 2010, 01:13 PM

Hopefully this is helpful and not too late, the only thing I'd add to Bill's comment is stay away from 720P.

If your' zoomed in to a MCU or CU 720P can look pretty good, but if your using a wide angle lens, especially with sharp focus, there's just too much moire in 720P.

Kent Frost · May 21st, 2010, 03:35 PM

It's not so much the framerate, but rather the shutter speed PER frame that you shoot. The higher, the better. This way you will minimize the blur in each frame and will result in a cleaner keying.

May 21st, 2010, 04:38 AM	#1
Bruce S. Yarock Trustee Join Date: May 2004 Location: Pembroke Pines, Fl. Posts: 1,842	Best frame rate for greenscreen? I'm shooting some green screen footage this afternoon and was wondering if I should use the 720 60i setting instead of 24 or 30. I know it's a little late to ask, but if anyone can answer this am, that would be great. Thanks Bruce Yarock

May 21st, 2010, 09:35 AM	#2
Tim Kolb Major Player Join Date: Mar 2005 Location: Neenah, WI Posts: 547	What's the delivery framerate? shooting at the delivery framerate, but progressive scan is fairly typical method. If you're delivering at 720p, I'd still try to shoot 1080 if you are delivering at 29.97fps or less (1080p59.94 is not widely available as a recording format of course)...more spatial resolution won't hurt. Upping the framerate won't help nearly as much as increasing the frame size. In general, I'm not sure I'd shoot green screen on a DSLR...pretty compressed stuff there. Others have probably had more experience with it though, and if you can key HDV (and I have), H.264 is likely manageable. Better yet, an external recorder like a KiPro, or a Flash Nano would help make post a bit easier... So...there are some thoughts to start... __________________ TimK Kolb Productions

May 21st, 2010, 03:35 PM	#6
Kent Frost Regular Crew Join Date: Jul 2006 Location: Springfield, Missouri Posts: 117	It's not so much the framerate, but rather the shutter speed PER frame that you shoot. The higher, the better. This way you will minimize the blur in each frame and will result in a cleaner keying. __________________ "Your world is all these elements; of light and sound, of taste, smell, and touch. Woven together in many dimensions on the fabulous loom of your brain. Your brain; the most complicated thing in the world, which you yourself grew...without even thinking about it."

May 21st, 2010, 09:50 AM	#3
Bill Pryor Contributor Join Date: Jan 2003 Location: Kansas City, MO Posts: 4,449	I shoot everything at 24 fps. No problems at all with greenscreen. Chroma keying is fine with the 7D, assuming you light it right and have decent keying software.

May 21st, 2010, 01:13 PM	#5
Chuck Spaulding Trustee Join Date: Nov 2004 Location: Thousand Oaks Posts: 1,104	Hopefully this is helpful and not too late, the only thing I'd add to Bill's comment is stay away from 720P. If your' zoomed in to a MCU or CU 720P can look pretty good, but if your using a wide angle lens, especially with sharp focus, there's just too much moire in 720P.