Is this Interlacing? Pictures included.

mungk

mungk

Well-known member
Footage Shot on DVX100b using 24pa.

1.) I first setup a new project sequence in Premiere CS4 using the DV-24p preset which gives me a 23.976 timeline.


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2.) I import my footage that I shot with onlocation directly onto a harddrive. Notice the frame rate at 29.97 which I believe the camerea shoots at.

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3.) I interpret the footage with the settings below to convert the footage to 23.976 frame rate. For field order i'm using the (No Fields-Progressive) setting.

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4.) Notice that after the file interpretation the frame rate now matches the sequence frame rate of 23.976.

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5.) I then drag my footage to the timeline and review on the monitor at the highest quality setting and this is what i'm seeing during big movments and pans. Is this a result of interlacing and my settings not being correct or just a product of shooting 24pa, lowlight, high zoom, and quick movement?


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Thanks in advance.
 
K so after talking to a friend I believe that the problem was solved by starting with a NTSC-DV preset instead of the NTSC-24p setting.

Since I start off with a 29.97 timeline now, I then keep my imported footage at 29.97 and the interlacing problem is gone.

I guess my problem was assuming that my footage when captured through onlocation wasn't interlaced.
 
Your settings all looked right the first time. Maybe it's an issue with On Location? I haven't used CS4 much, but in earlier versions of Premiere, when I opened my 24p footage in a 24p project the files were automatically interpreted as 23.976. The pulldown was removed automatically, and there were no interlaced frames.

Even in your 29.976 project, if you step through a frame at a time at full size you'll see interlacing every 4th frame or so.

Try shooting 24p to tape, then capture and open up that file in a 24p project. I think you'll see the file is 23.976. This probably doesn't help you much.

-Kevin
 
yeah, you should be able to just open a NTSC DV24p project and drag your 24p footage into it and you shouldnt have to interpret anyithing, it should automatically pull down to 23.976p .. the issue may be that you didnt shoot your footage in either 24p or 24pa. you have to set the camera to one of those 24p modes or else it just shoots either 30p or more likely 30/60i which would give you interlacing issues when trying to use them in a 24p project. double check to make sure the footage is actually shot in either 24p mode. anyway if it is it could be an issue with onlocation not working well with the 24p modes..ive never used it with DV24p to see how it works .. only DVCPROHD. but again, if you record straight to the cams tape deck in either 24p mode you just open a 24p project and capture it, all should be well with no interlacing. generally speaking its best to use scene detection with 24p mode capture from tape as well.
 
Yeah i'm positive it was shot with 24pa scenefile f6. The fact that my files are 29.97 seems correct since the dvx adds the extra frames which then need to be removed with the 2:3:3:2 pulldown to get it back to 23.976. I'm thinking premiere is not doing the pulldown correctly.

I've tried to use the capture setting to test out your theory but it appears that the capture screen turns on my built in macbook pro webcam instead of recognizing my dvx. I'm at a loss right now as i'm starting to lose faith in adobe products.
 
So after thinking about it some, I'm thinking that since the footage was captured via onLocation and not through tape and firewire, the DVX flags that mark the 3:2 pulldown frames are no longer applicable. Thus trying to properly remove the pulldown in premiere is impossible cause the flag information is no longer there.

My guess is that onLocation is only good for when you're not shooting 24p.

Lessons learned.
 
On the surface it looks as though you shot 24p and not 24pa. This would explain your footage showing as being 29.97. But I know nothing of on location.
 
mungk said:
since the footage was captured via onLocation and not through tape and firewire, the DVX flags that mark the 3:2 pulldown frames are no longer applicable...
My guess is that onLocation is only good for when you're not shooting 24p.
Click to expand...

That's incorrect. The flags for pulldown are preserved in clips recorded by OnLocation. Indeed, everything in the video stream is preserved. The data stream is recorded direct to disk without ever having been decompressed, so OnLocation has no opportunity to muck with anything if we wanted to. There could conceivably be a problem with the file header, but I assure you that's something we tested pretty thoroughly. If you send me a short clip, we can look under the hood to confirm.

Incidentally, what is the Reocording File Format set to in the Field Monitor's flyout menu?
 
Unfortunately, in CS4, you DO have to Interpret Footage and check the "Remove 24p DV pulldown" box. At least until an update changes it back to the automatic process it used to be in CS2/CS3.
 
David Jimerson said:
Unfortunately, in CS4, you DO have to Interpret Footage and check the "Remove 24p DV pulldown" box. At least until an update changes it back to the automatic process it used to be in CS2/CS3.
Click to expand...

Reading through the boards for hours I kinda have the same issue. Just got CS4 recaptured and footage looks grainy. Light was good shot outdoors for some scenes F6. (stock settings)

Soooo. In the project window my last capture frame rate showed 29.97 (captured media) but my sequence shows 23.976 ?!?
I than went to Preferences than media and set Indeterminate Media Timebase to 23.976 ? What exactly is the Indeterminate timebase? And should I even be messing with it?

I also read about how CS4 doesn't automatically remove the pulldown, that I have to do it manually by interpret footage? This option (interpret footage) is not selectable.

Please shed some light on this. I'm not going to capture again until I get some insight because I'm sure I am not doing something right.


thanks
 
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The 4.1 update cleared up this issue. Pulldown is now automatically removed. You should update Premiere as soon as possible.
 
Sorry for the jack, but... I just exported this video and I'm getting these nasty lines. I clicked the option for 'lower field first' when exporting. By clicking that option, does that deinterlace? When exporting via .wma the option is there 'allow deinterlace processing', but nothing for the h.264 codec.

thanks
 

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David, this was shot on my old camera a GL2. With the H.264 out put the only option I have is, upper field, lower field or (none progressive). So the latter is what I should select?
 
If you want to get rid of the interlacing, yes. But it may give you other things you don't want, like ghosting, if there's a lot of motion. When you deinterlace footage, there's always a compromise of some kind.
 
ihatedv said:
worked like a charm!
Click to expand...

It worked like a charm for the last clip that I rendered (trailer all slo-mo) but for the actual movie file. (3 clips in .wma) and (3 in h.264) they all look like they have serious interlace lines.

Any other suggestions?
 
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