50p, 25p, 100th v 50th? at DVinfo.net

Go Back   DV Info Net > Windows / PC Post Production Solutions > What Happens in Vegas...

What Happens in Vegas...
...stays in Vegas! This PC-based editing app is a safe bet with these tips.


Reply
 
Thread Tools Search this Thread
Old August 20th, 2017, 09:55 AM   #1
Regular Crew
 
Join Date: Oct 2010
Location: uk manchester
Posts: 49
50p, 25p, 100th v 50th?

I mainly shoot with Canon XF300's (up to four) at 25p with shutter speed set to 50th sec.
My editing is therefore done on a 1080p timeline.

I have added a Panasonic FZ2000 for some 4k footage, but mostly for high speed (slow mo) shooting for short clips of fast action to be inserted here and there.

When I choose the frame rate on the various preset options available on the FZ2000 (up to 120pfs) it plays back in nice slow mo within my standard timeline. No issues.

However, I have experimented with shooting in 50p (up to 200mbp is available ALl intra) to gain higher quality on the slow motion.

Should I shoot the 50p footage at 100th sec (as people seem to advise i.e. double frame rate) or keep it at 50th to match the 25p?

I ask because initial observations show some motion blur effects when I render out to 25p MP4 having set the 50p footage to a higher shutter speed (100th)

What's the best way to achieve higher quality slow motion from the 50p footage clips but still have them play back smoothly?

thanks. Ian
Ian Chapman is offline   Reply With Quote
Old August 20th, 2017, 09:02 PM   #2
Major Player
 
Join Date: Jun 2008
Location: Sutton, Australia
Posts: 326
Re: 50p, 25p, 100th v 50th?

If you want the same amount of motion blur you have to have same shutter speed regardless of the frame rate, e.g. 50fps viewed at 25fps to look like 25fps has to be captured at the same frame rate as the 25fps - in your example 1/50th second. But don't obsess about it - the twice frame rate "rule" is just a rule of thumb. Like you said, you might be getting sufficient pleasing motion blur at half the shutter speed.
Rainer Listing is offline   Reply With Quote
Old August 20th, 2017, 09:11 PM   #3
Regular Crew
 
Join Date: Jan 2017
Location: Newark, CA
Posts: 99
Re: 50p, 25p, 100th v 50th?

I think the rule is important for 24p and 25p, it is somewhat less so for 30p.

When you go to 50p and up it does not matter too much.

For slow motion I would maintain the same shutter angle, e.g. 50p -> 25p use 50p = 1/100.
Cary Knoop is offline   Reply With Quote
Old August 21st, 2017, 01:41 PM   #4
Trustee
 
Join Date: Nov 2007
Location: Bristol UK
Posts: 1,271
Re: 50p, 25p, 100th v 50th?

Interesting thread regarding the same issue.

Shutter speed for 60p

Paul.
__________________
Round 2
Panasonic HC-X1, Vinten PB, Sennheiser G3 bits. Vegas pro 14 on i7,AMD Radeon RX480 8GB.
Paul Kellett 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...

Professional Video
(800) 833-4801
Portland, OR

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

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

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 > Windows / PC Post Production Solutions > What Happens in Vegas...

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 03:47 AM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network