Jerky 24P footage in CS3?

rocketguy2

rocketguy2

Well-known member
I'm shooting footage with my DVX-100A set at the F5 scene file setting. I capture the footage into a new 24P project and everything looks fine during actual capture. However, when I drop the footage onto the timeline and preview, motion is jerky and stuttering. If I deinterlace, using field options, the problem disappears.

Isn't 24P footage already deinterlaced? What am I doing wrong here?

Thanks!
 
It sounds like your footage still has the pulldown in it. You can tell be stepping through the frames and seeing intermittent interlaced frames.

On the dvx100a, 24p is recorded in a 60i stream because of the requirements of Mini-dv so you have to remove that pulldown upon capture. When you capture, you should have it set to 24p capture so that Premiere with remove the pulldown and give your 23.976fps(24p) footage.

You can also use a program like DVFilm Maker to remove or add 2:3 pulldown or advanced pulldown if you can't recapture for some reason.

Best,
Andy
 
Assuming you haven't changed any of the F5 scene file settings, you're shooting 24p standard and not 24p Advanced. You should be shooting 24pA if you want to edit in a 24p sequence.

24p or 24pA is not "deinterlaced." They both have interlaced frames until you remove their pulldown. And removing pulldown is not the same as deinterlacing.

Deinterlacing is taking interlaced footage and either blending or interpolating the interlaced frames together to make progressive frames. This is generally accomplished using some kind of blur, so you lose resolution.

Removing pulldown is not deinterlacing. It's taking the 29.97 stream the footage is recorded in and reconstructing the original, full-resolution progressive frames. There is no blurring or interpolating.

That said, in a 24p sequence in CS3, there should be automatic pulldown removal of either standard or advanced pulldown, so there should be no problems. But for this purpose, 24pA is superior and it's what you should use when you want to edit in a 24p sequence.

Is there a red line over the footage?

In any case, even assuming that for some reason the automatic pulldown removal did not happen, deinterlacing is not the way to solve the problem. You should never deinterlace progressive footage. What you should do instead is Interpret the footage, and use the "remove 24p DV pulldown" checkbox.
 
Andy Olson said:
When you capture, you should have it set to 24p capture so that Premiere with remove the pulldown and give your 23.976fps(24p) footage.
Click to expand...

There's no option for 24p capture, like there is in FCP or Avid. The footage is captured as normal and the pulldown is removed on the timeline, not at capture.
 
Thank you, gentlemen. Will recapture everything and make sure to select "interpret footage" and check remove 24p pulldown, rather than deinterlace.

No, there is no red line through the footage.
 
Look in the Project window -- what frame rate is listed with the footage? If it already says "23.976," then don't Interpret the footage.
 
Yes, it's 23.967. Footage still jerky though! Have tried previewing at lower quality, no change.

Weird; I tried experimenting and when selected "ignore alpha channel", it played perfectly.

I also imported it into After Effects and previewed it there; it played fine.

It doesn't seem to be an issue with my computer and, as mentioned, the footage plays perfectly during capture.
 
Then there's no need to recapture.

Try opening a new 24p sequence and see if the problem persists. If it doesn't, then there may be some effect or setting you have going on in your current project.
 
This is a little late in the thread but I had the same problem and couldn't find a solution. What ended up working for me was, as I was going through the footage to re capture it I noticed there were a few slight hiccups in the time code in a few spots of the tape where I had previewed the footage in the field and let it run a few frames too far brfore switching back to record. The time code didn't start over it just jumped a little. I re captured all of the footage in chucks between the hiccups and everything was fine. The only thing I can guess is that the pulldown cadence stayed running in it's correct cadence but the footage order shifted slighty causing the pulldown to occur correctly but in the wrong places. This may not be the exact science behind it but all of the footage looks good now.
 
Timecode breaks like that will definitely mess up capture. :) The way you ended up breaking the timecode there is why people used to "stripe" or "black" their tapes before shooting.
 
Yes, there were definitely some breaks in the time code of my footage as well. I was under the impression the DVX-100A didn't require tapes to be striped; maybe I'm not understanding something completely here.
 
It doesn't if you don't fiddle with the footage while you're recording. But if you review and aren't careful about forwarding past the point of last recording, you'll get breaks. Using the End Search button instead of trying to find the end manually can help, though.
 
Thanks very much, David. BTW, "Young Sherlock Holmes" was a ripping good film, as referenced by your avatar!
 
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