Frame rate help at DVinfo.net

Brendan Pyatt · August 23rd, 2010, 07:33 AM

Hi,

My NX5E arrives tomorrow. I shoot alot of action, sports etc and edit in FCP

I plan to shoot 720/50. I am looking forward to the possible slow motion by conforming in Cinema Tools to 25p (this is the correct method?).

What happens if I drop a 720/50p clip into a standard 25p timeline - do I loose every other frame and therefore end up with jerky motion? Should I normally shoot 720/25p and only use 50p when wanting to do slow motion?

Thanks.

Arkady Bolotin · August 23rd, 2010, 08:36 AM

The main difference between 720/50p and 720/25p is motion rendition.

720/50p is primarily for recording action stuff like sport and news. It looks fantastic when played back at 50p (if your TV can do it).

However, 720/25p gives you a “film look” (a cinematic stuttering that so accepted by the audience).

Brendan Pyatt · August 23rd, 2010, 09:21 AM

thanks.

are you saying that if i shoot sports that i should shoot in 720/50p and edit in 50p?

i am used to editing at 25 fps as i shoot 50i and now am a little confused!

Arkady Bolotin · August 23rd, 2010, 09:52 AM

If you shoot in 720/50p, you should definitely make 50p timeline and drug your footage in. That will give you a “looking through window” quality video.

Some say that 720/50p looks better than even 1080/25p.

Chris Adeyefa · August 24th, 2010, 06:57 AM

Yes Brenden if you want to shoot sports or fast pased movement always shoot in 50i or 50p and edit on a 50p or 50i timeline. That way if you want to do slow motion in any case you will always have the clearest picture. If you were to shoot in 25p and then slow down the same shot. You will see alot more blurr and degration of quality. You should only shoot and edit in 25p when you want to do creative work such as a music video or a short film as it provides the most "Film Like" picture.

Ron Evans · August 24th, 2010, 09:36 AM

Brendan I expect your confusion may stem from the confusing nomenclature of frame rates. Interlaced cameras shoot video at an exposure rate ( how often they expose shots) of either 50 exposures a second for PAL and 60 exposures a second for NTSC but only record or transmit a field at these rates ( half the vertical resolution) Since two fields make a frame this is then called 25fps for PAL and 30fps( 29.97) for NTSC. For time code this is correct but the temporal motion is at 50fps or 60 fps just with half the vertical resolution. Thus interlace will produce a smoother image than progressive at 25p or 30P. Progressive at 50P or 60P will produce the same smoothness as interlaced and will have complete frames of information making processing for effects or extracting stills easier.

Ron Evans

August 23rd, 2010, 07:33 AM	#1
Brendan Pyatt Regular Crew Join Date: Sep 2005 Location: Southampton UK Posts: 165	Frame rate help Hi, My NX5E arrives tomorrow. I shoot alot of action, sports etc and edit in FCP I plan to shoot 720/50. I am looking forward to the possible slow motion by conforming in Cinema Tools to 25p (this is the correct method?). What happens if I drop a 720/50p clip into a standard 25p timeline - do I loose every other frame and therefore end up with jerky motion? Should I normally shoot 720/25p and only use 50p when wanting to do slow motion? Thanks.

August 23rd, 2010, 08:36 AM	#2
Arkady Bolotin Regular Crew Join Date: Sep 2008 Location: Beersheba, Israel Posts: 111	The main difference between 720/50p and 720/25p is motion rendition. 720/50p is primarily for recording action stuff like sport and news. It looks fantastic when played back at 50p (if your TV can do it). However, 720/25p gives you a “film look” (a cinematic stuttering that so accepted by the audience).

August 23rd, 2010, 09:21 AM	#3
Brendan Pyatt Regular Crew Join Date: Sep 2005 Location: Southampton UK Posts: 165	thanks. are you saying that if i shoot sports that i should shoot in 720/50p and edit in 50p? i am used to editing at 25 fps as i shoot 50i and now am a little confused!

August 23rd, 2010, 09:52 AM	#4
Arkady Bolotin Regular Crew Join Date: Sep 2008 Location: Beersheba, Israel Posts: 111	If you shoot in 720/50p, you should definitely make 50p timeline and drug your footage in. That will give you a “looking through window” quality video. Some say that 720/50p looks better than even 1080/25p.

August 24th, 2010, 06:57 AM	#5
Chris Adeyefa Regular Crew Join Date: May 2010 Location: Montreal, Quebec Posts: 60	Yes Brenden if you want to shoot sports or fast pased movement always shoot in 50i or 50p and edit on a 50p or 50i timeline. That way if you want to do slow motion in any case you will always have the clearest picture. If you were to shoot in 25p and then slow down the same shot. You will see alot more blurr and degration of quality. You should only shoot and edit in 25p when you want to do creative work such as a music video or a short film as it provides the most "Film Like" picture.

August 24th, 2010, 09:36 AM	#6
Ron Evans Inner Circle Join Date: Mar 2003 Location: Ottawa, Ontario, Canada Posts: 4,222	Brendan I expect your confusion may stem from the confusing nomenclature of frame rates. Interlaced cameras shoot video at an exposure rate ( how often they expose shots) of either 50 exposures a second for PAL and 60 exposures a second for NTSC but only record or transmit a field at these rates ( half the vertical resolution) Since two fields make a frame this is then called 25fps for PAL and 30fps( 29.97) for NTSC. For time code this is correct but the temporal motion is at 50fps or 60 fps just with half the vertical resolution. Thus interlace will produce a smoother image than progressive at 25p or 30P. Progressive at 50P or 60P will produce the same smoothness as interlaced and will have complete frames of information making processing for effects or extracting stills easier. Ron Evans