Slow Motion on the DVX-100

J

jojogalan

Member
Hello,

I am trying to get good slow motion with the DVX-100B and Adobe Premiere Pro CS3.

I am shooting 60i interlaced and then putting that in a 24p timeline and using Time Warp to 40% and am not getting good results. Any pointers or help would be greatly appreciated.

Also, when importing from the DVX-100B to Premiere Pro, even though I shot at 60i, it imports at 29.97. Is this normal?

I am a newbie, so please be gentle. Thanks!

jojo
 
In FCP, I just went through a whole mess where my 60i video was also imported at 29.97. It just seemed like thats how it identifies the clip, but that shouldn't be a problem.
 
Shutter speed should be 1/120th. Your 40% slowdown is right. What exactly are your symptoms? "Not getting good results" doesn't give us much to go on.
 
40% slowdown never works, at least not in FCP. Try using JES deinterlacer.

And I usually shoot slow mo at > 1/250 shutter speed. I've gone up to 1/1000 with good results. Of course that depends on whether or not you want motion blur.
 
jojogalan said:
Also, when importing from the DVX-100B to Premiere Pro, even though I shot at 60i, it imports at 29.97. Is this normal?
Click to expand...

60i is NTSC interlaced video and is recorded with a timebase of 29.97 sometimes often incorrectly referred to as 30 frames per second.
 
jojogalan said:
I have read the book. I record at 60i and 120 shutter speed. Then I slow down to 40% in Premiere Pro CS3 with the Time Warp Effect in a 24P Timeline. But it just doesn't look as good as what I know it can do from the examples online. Any advice would be greatly appreciated!
Click to expand...

Well go out and mess around with different shutter speeds
here are the differences (in studio example)
http://www.youtube.com/watch?v=6JOwLlp2CnY

Plus what are your rendering settings?

Do you have a link to your video?
 
I am recording at 60i with 1/120 shutter. I read the Barry Green DVX Book and that's what it said to do.

I am going to try slow motion in my friends Adobe After Effects CS3 in a 60i and 24p composition and see if I can get it to look better. I'll post a sample later today and see if I doing something really wrong or not.

Thank you very much for your help.

JJ
 
What you're doing in camera is correct. What you're doing wrong is in the software. When you bring 60i into a 24p timeline, its going to CONVERT into 24p. So it's going to cut out certain frames to make it 24p and then when you slow it down, its gonna look chunky with lots of strobing.

What you need to do is this, bring your 60i footage into a 60i timeline. Slowdown in that timeline. Export the movie. NOW bring into a 24p timeline. The slowmo will now playback smooth without the strobing.

Hope that helps!
 
Sorry, it is 40% speed. It's just that simply slowing down the clip to 40% doesn't give you smooth slow motion.

Here's a new video I shot. There are 3-4 slow mo shots throughout. It's lengthy, but you may like it.

http://vimeo.com/11509128
 
OK. I have been messing around and learning a lot about the software and my camera, the great DVX100B. I record at 60i with a shutter of 1/120. When I import that into a 60i timeline in After Effects, and export at 60, the video is half as slow. Is this normal?

Or should I record at 60i, and then import that video into a 29.97 timeline and do my editing there?

Thanks in advance for your wisdom.
 
jojogalan said:
OK. I have been messing around and learning a lot about the software and my camera, the great DVX100B. I record at 60i with a shutter of 1/120. When I import that into a 60i timeline in After Effects, and export at 60, the video is half as slow. Is this normal?

Or should I record at 60i, and then import that video into a 29.97 timeline and do my editing there?

Thanks in advance for your wisdom.
Click to expand...

60i isn't 60fps, it's actually 29.97. 60i means 60 fields interlaced, so there are 2 fields to every frame, which comes out to 29.97. So you want to put the 60i footage in a 29.97 timeline.
 
Thanks infinite design. Here is a link to a slo mo example I have done.
http://www.youtube.com/watch_private?v=JEm3nTAR_Ns&sharing_token=VMFp4IhD6oz-1FkXWS0j5w

First part is 60i video, 2nd part is 50% slo mo.
I started with recording on the Panasonic DVX-100B in 60i with a shutter of 1/120.
I then imported into a 29.97 timeline and removed any pulldown. I then de-interlaced. Next, I slowed the video to 50% speed and exported at 29.97. I chose 50% because the fps is half and this would give me the best quality. Is this correct?
Am I doing this correctly? Any info would be much appreciated.
 
jojogalan said:
Thanks infinite design. Here is a link to a slo mo example I have done.
http://www.youtube.com/watch_private?v=JEm3nTAR_Ns&sharing_token=VMFp4IhD6oz-1FkXWS0j5w

First part is 60i video, 2nd part is 50% slo mo.
I started with recording on the Panasonic DVX-100B in 60i with a shutter of 1/120.
I then imported into a 29.97 timeline and removed any pulldown. I then de-interlaced. Next, I slowed the video to 50% speed and exported at 29.97. I chose 50% because the fps is half and this would give me the best quality. Is this correct?
Am I doing this correctly? Any info would be much appreciated.
Click to expand...

I watched your video - looks like autofocus was on. Definitely turn it off! It's hunting all over the place when your subject moves around and makes it look very amateurish. Just manually focus on him and leave it alone like the pros do. Anyway you want to slow it down 40% because you shot at 60i and 40% of 60 is 24 (since you want to end up in a 24p timeline.) I know that 60i is really in a 29.97 timeline but don't worry about that. Since you slowed to 50%, the NLE had to adjust fields accordingly to make it fit into your timeline and that makes it look choppy. Sorry I'm not saying it more eloquently. Just read Barry's DVX book. He does a good job discussing this.
 
I've played with that on my DVX - thing is, the fields vs. frames always looked ridiculously soft to me - it ran very smoothly, just thought it looked pretty terrible.

Anyone had better results?

Shooting with my DSLR, I can do 60p @ 720, and drop it in a 30p or 24p timeline and it looks gorgeous. But I'm working with whole frames, not fields.
 
Michael Carter said:
I've played with that on my DVX - thing is, the fields vs. frames always looked ridiculously soft to me...
Click to expand...

60i is good for smoothness because you have 60 different pictures of changing motion (fields) per second, but since it's interlaced the NLE is filling in the vertical gaps which are missing in every other line. If you want it sharper, you could shoot at 30p and slow it down 20%. It's obviously only half the slowdown that you'd get with starting with 60i, but since you are starting with progressive fields, the NLE doesn't have to fill in vertical gaps.
 
Hacker said:
60i is good for smoothness because you have 60 different pictures of changing motion (fields) per second, but since it's interlaced the NLE is filling in the vertical gaps which are missing in every other line. If you want it sharper, you could shoot at 30p and slow it down 20%. It's obviously only half the slowdown that you'd get with starting with 60i, but since you are starting with progressive fields, the NLE doesn't have to fill in vertical gaps.
Click to expand...
You don't have 60 different pictures, you have 30 pictures or "frames". 60i means 60 interlaced "fields". It requires two fields to to be added together or interlaced in order to create one single picture or "frame".
For any given single picture or frame, one field consists of even numbered horizontal scan lines and the next field contains odd numbered horizontal scan lines. Compiling even and odd horizontal scan lines from two adjacent fields creates one single composite frame.
 
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