Captured clip frame rate at DVinfo.net

Wade Hanchey · January 24th, 2007, 07:40 PM

New user here with Vegas 7. I shot some HD footage with my Canon A1 at a frame rate of "60i". When I captured it into Vegas, it is shown as "30i". This is confusing me. The project settings don't have anything to do with this do they?

Wade Hanchey · January 26th, 2007, 02:17 PM

Surely someone has an idea. I don't want to continue capturing clips until I'm sure I won't have to recapture everything to fix a problem. Thanks.

Mauritius Seeger · January 26th, 2007, 07:33 PM

i am quite sure it's the same and you dont need to worry about it.

it's not the most scientific terminology since i would have thought 60i (as opposed to 60p) would suggest 60 frames a second (but interlaced) - which clearly isn't true. so your camera shoots at 30i and vegas imports it as such.

David Jimerson · January 28th, 2007, 01:35 PM

It's the same thing for your purposes. I do wish the whole idea of referring to 60i as having a "frame rate" of 30 fps would go away. Probably way too entrenched for that, though.

It's called "60i" because 60 separate pictures are taken per second, so there are 60 moments in time -- 60 time samples -- captured. True, they are half-pictures, comprised of every other scan line per, but they're still 60 distinct pictures.

Wade Hanchey · January 29th, 2007, 07:39 PM

Hi David,

Thanks for the additional input. I was still a little confused but I think you've cleared it up for me. Correct me if I'm wrong. My A1's manual says 60i is the same as SD TV. This is more commonly referred to as 30fps interlaced, which is how Vegas describes it. Did I get that right? Initially when I saw 30fps interlaced, I thought 30 half pictures per sec. I could still be confused by it if I try to overthink it. Thanks!

Mike Kujbida · January 29th, 2007, 07:57 PM

You did get it right Wade :-)
As David said, 60i refers to 60 half-pictures (or fields) per second.
Since one frame = 2 fields (odd numbered field and even numbered field), 60 of them (when interlaced) = 30 frames per sec.

Wade Hanchey · January 29th, 2007, 08:33 PM

Thanks Mike.

I'll tell ya. Another thing that added to my confusion was a frame rate option in Vegas's project properties that was referred to as "double NTSC". I wasn't so sure they weren't talking to me with that one.

David Jimerson · January 30th, 2007, 08:44 AM

You can use that if you have, say, 60p footage, because it's 60 (or 59.94) actual frames per second.

January 24th, 2007, 07:40 PM	#1
Wade Hanchey Regular Crew Join Date: Oct 2006 Location: Wilmington, NC Posts: 117	Captured clip frame rate New user here with Vegas 7. I shot some HD footage with my Canon A1 at a frame rate of "60i". When I captured it into Vegas, it is shown as "30i". This is confusing me. The project settings don't have anything to do with this do they?

January 28th, 2007, 01:35 PM	#4
David Jimerson Jubal 28 Join Date: Mar 2005 Location: Wilmington, NC Posts: 872	It's the same thing for your purposes. I do wish the whole idea of referring to 60i as having a "frame rate" of 30 fps would go away. Probably way too entrenched for that, though. It's called "60i" because 60 separate pictures are taken per second, so there are 60 moments in time -- 60 time samples -- captured. True, they are half-pictures, comprised of every other scan line per, but they're still 60 distinct pictures. __________________ www.wrightsvillebeachstudios.com

January 30th, 2007, 08:44 AM	#8
David Jimerson Jubal 28 Join Date: Mar 2005 Location: Wilmington, NC Posts: 872	You can use that if you have, say, 60p footage, because it's 60 (or 59.94) actual frames per second. __________________ www.wrightsvillebeachstudios.com

January 26th, 2007, 02:17 PM	#2
Wade Hanchey Regular Crew Join Date: Oct 2006 Location: Wilmington, NC Posts: 117	Surely someone has an idea. I don't want to continue capturing clips until I'm sure I won't have to recapture everything to fix a problem. Thanks.

January 26th, 2007, 07:33 PM	#3
Mauritius Seeger Regular Crew Join Date: Aug 2006 Location: London United Kingdom Posts: 77	i am quite sure it's the same and you dont need to worry about it. it's not the most scientific terminology since i would have thought 60i (as opposed to 60p) would suggest 60 frames a second (but interlaced) - which clearly isn't true. so your camera shoots at 30i and vegas imports it as such.

January 29th, 2007, 07:39 PM	#5
Wade Hanchey Regular Crew Join Date: Oct 2006 Location: Wilmington, NC Posts: 117	Hi David, Thanks for the additional input. I was still a little confused but I think you've cleared it up for me. Correct me if I'm wrong. My A1's manual says 60i is the same as SD TV. This is more commonly referred to as 30fps interlaced, which is how Vegas describes it. Did I get that right? Initially when I saw 30fps interlaced, I thought 30 half pictures per sec. I could still be confused by it if I try to overthink it. Thanks!

January 29th, 2007, 07:57 PM	#6
Mike Kujbida Inner Circle Join Date: May 2005 Location: Windsor, ON Canada Posts: 2,770	You did get it right Wade :-) As David said, 60i refers to 60 half-pictures (or fields) per second. Since one frame = 2 fields (odd numbered field and even numbered field), 60 of them (when interlaced) = 30 frames per sec.

January 29th, 2007, 08:33 PM	#7
Wade Hanchey Regular Crew Join Date: Oct 2006 Location: Wilmington, NC Posts: 117	Thanks Mike. I'll tell ya. Another thing that added to my confusion was a frame rate option in Vegas's project properties that was referred to as "double NTSC". I wasn't so sure they weren't talking to me with that one.