HV20 true 24p?

J

jbednarski

Active member
I just got an HV20 and shot some test footage this weekend. I Imported what was supposedly 1080p24 footage into FCP at an HDV 1080p24 preset. When looking at the footage it looked great until I put it in a timeline. Then it looked interlaced. All of my renders were interlaced also. I applied the deinterlace filter and them the timeline and renders looked fine (not as good as the raw footage) but not interlaced. I was under the inporession that all 24fps footage was progressive. I'm new to HDV (I normally use an HVX200). Is there something that I'm missing here. All the boards I've read tout this as Canon's first foray into true 24p. Also, if the preset was correct and the camera settings were correct shouldn't the footage not need to be rendered / re-rendered? If anybody can clue me in on the EXACT camera settings for CINE 24p and what preset to use I would be grateful.
 
I don't use FCP, but you need to do a pulldown 3:2 to extract th 23.976 frames from the interlace 60i -- like the DVX camera. As of now, pulldown on the fly is not possible on NTSC HV20. Possible solution: use cineform product, or use After Effects (load - interpret footage - select pulldown scheme, the first one and that's it).

Hope that helps.
 
you are missing a step. the 24p is embedded in a 60i wrapper just like the DVX100's standard 24P mode. which means it's doing a sort of in-camera telecine. so you have to remove the 2:3 pulldown by capturing the footage, determining what part of the cadence the first frame is, then running it thru a reverse telecine process in Cinema Tools. re-import that new 23.98 footage and you have true 1080/24p from the canon HV20.

as you can see here, ive done it with my own HV20 many times...

http://www.sabipictures.com/heartofnow/vx/HV20Brevis_test3.html
 
Your workflkow, give it to me.

Your workflkow, give it to me.

Zak,

Your footage looks great! Can you give a detailed step-by-step of how you accomplish this so I won't spend the better part of the week trying to figure it out?

1. Are you capturing in FCP? What setting/preset are you using?

2. Then exporting a Quicktime movie? In what format/size?

3. How exactly to you see the cadence in Quicktime?

4. Then, I'm assuming, you trim the footage and open in Cinema Tools? I was under the assumption that HDV can not be processed by Cinema Tools due to how it's compressed (Long GOP). Is this true? How did you do it?

5. I get the re-import part.

Thanks for your help. I'm sure a lot of HV20/FCP users would like to know your workflow.
 
my workflow...

digitize individual shots in FCP using the Apple Intermediate Codec.

open clips in QuickTime player and excise beginning frames until the clip is starting with the first progressive frame (DD) in the cadence (DD AA BB BC CD DD AA, etc). save.

open clips in Cinema Tools. Reverse Telecine to 23.98 starting on the DD frame. other settings stay at default.

check new clips in QuickTime player to verify 23.98 frame rate and progrsssive.

delete original media.

import new clips into FCP. hack away.
 
Marshallarts said:
I also would love to know! Please reply! Your footage looked great!
Click to expand...
just for you i will travel back in time and post my workflow approximately one hour before your post... there, done.
 
Thanks Zak! But one more thing...

Thanks Zak! But one more thing...

I understand your workflow except for this part:

open clips in QuickTime player and excise beginning frames until the clip is starting with the first progressive frame (DD) in the cadence (DD AA BB BC CD DD AA, etc). save.

I'm playing w/QT Pro and can't figure this part out. How do you see where the progressive frames are?
 
the cadence goes p p p i i.

the two interlace frames will each look like a jaggy overlap of two frames. you'll see this where your subject is in motion. you want the first frame of the media file to start on the first progressive frame that follows these and can remove them by hitting CMD-X. that first progressive frame is the DD frame in cinema tools.
 
Thanks Zak!

Thanks Zak!

I tried your workflow last night and it worked perfectly. Thanks for saving me a lot of grief.
 
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