Frame rate for slow motion? at DVinfo.net
DV Info Net

Go Back   DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon HDV and DV Camera Systems > Canon XH Series HDV Camcorders

Canon XH Series HDV Camcorders
Canon XH G1S / G1 (with SDI), Canon XH A1S / A1 (without SDI).

Reply
 
Thread Tools Search this Thread
Old September 21st, 2007, 07:26 AM   #1
Major Player
 
Join Date: Aug 2007
Location: Warren, Pa
Posts: 785
Frame rate for slow motion?

I am going to be filming some archery hunts this fall, is there a frame rate that you recomend for this over another. I want to be able to do some super slow motion and not sure if 60 fps is the best choice for this or not.

Thanks
Denny Kyser is offline   Reply With Quote
Old September 21st, 2007, 09:22 AM   #2
Contributor
 
Join Date: Jan 2003
Location: Kansas City, MO
Posts: 4,449
The camera only shoots at 24fps and 30fps. It would be nice if it did do 60fps. The 1/60 shutter speed is standard for 30fps (60i). I've shot at 1/100 (in 60i) for shots I planned to slomo, but I really couldn't see any perceptable difference. You go too high with it and you can get some funky effects. Best thing is to do some tests before doing it for real.
Bill Pryor is offline   Reply With Quote
Old September 21st, 2007, 09:56 AM   #3
Major Player
 
Join Date: Aug 2007
Location: Warren, Pa
Posts: 785
sorry for the wrong termonology I am very new to this. I am a photographer with a desire to learn video. I usually shoot at 25i and like it alot, but wasnt sure if that would be good for this situation.

I will practice some before and try and figure it out.
Denny Kyser is offline   Reply With Quote
Old September 21st, 2007, 10:16 AM   #4
Contributor
 
Join Date: Jan 2003
Location: Kansas City, MO
Posts: 4,449
People often get frame rate and shutter speed mixed up. You said 25i...you mean 25p or 50i, I assume. Are you in PAL-land? The quality of slow motion you get is going to depend more on what software you use than anything else. Some systems are better than others, and there's some software called Twixtor that is reputed to be very good.
Bill Pryor is offline   Reply With Quote
Old September 21st, 2007, 10:53 AM   #5
Regular Crew
 
Join Date: Oct 2006
Location: United Kingdom
Posts: 451
There is a formula but I've forgotten it.

If I were shooting a 25F film and wanted some slo-mo sequences in it I would shot those at 50i and with a shutter speed of 5x that of the field rate i.e. 250.

I would then deinterlace and slo-mo the footage using an optical flow solution like twixtor, shake or Motion 3 have. By shooting 50i (60i) you'd have more temporal samples than 25F (24F & 30F).

If I find the formula I'll post it.
Tony Tremble is offline   Reply With Quote
Old September 21st, 2007, 05:12 PM   #6
Disjecta
 
Join Date: Apr 2004
Location: Seattle, Washington
Posts: 937
The formula for NTSC is the following:

Shoot at 60i at 1/120th shutter speed
Bring footage into a 60i timeline and deinterlace and export it which should essentially give you a 60p file.
Import into a 24p project timeline and set the speed to 40%
Make sure frame blending is off

The theory behind the 1/120th shutter speed is that when it is slowed down to 40%, on a 24p timeline, you have the equivalent of 1/48th shutter speed...
__________________
Try my Digital Therapy: http://www.pinelakefilms.com/digital_therapy.html
Films on ExposureRoom: http://exposureroom.com/members/disjecta.aspx/videos/
Steven Dempsey is offline   Reply With Quote
Old September 21st, 2007, 06:27 PM   #7
Major Player
 
Join Date: Aug 2007
Location: Warren, Pa
Posts: 785
Thanks for the detailed information
I have both Vegas and Adobe Premier CS3 for processing
Denny Kyser is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

B&H Photo Video
(866) 521-7381
New York, NY USA

Scan Computers Int. Ltd.
+44 0871-472-4747
Bolton, Lancashire UK


DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon HDV and DV Camera Systems > Canon XH Series HDV Camcorders

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



All times are GMT -6. The time now is 05:56 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2024 The Digital Video Information Network