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Old July 17th, 2006, 11:53 PM   #1
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wigglies..

I shot in 24p in SD, transfered via firewire using Avid Liquid.
Dropped it in a custom timeline (made sure the timeline says 'Progressive') with 23.98fps in 16:9

In a few frames when i scrub thro, i get these "interlace"/"wiggles" on the edges, it dissappears in the next few frames and appears intermittently. These are screencapture of subseqent frames.

any ideas? I thot these appear only in *interlace* footage.. why am I getting this in progressive footage?
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Old July 18th, 2006, 03:25 AM   #2
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same problem over here

I noticed this a few weeks ago but I couldnt see it in the footage but only the frame grab.

Here is one of my wiggly grabs:

http://avistudios.com/hd100grabs/frame88.bmp
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Old July 18th, 2006, 07:32 AM   #3
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Click the "Q" (quality inlay) button and select "High Quality" and then below that select "Odd Field". This will flatten an interlaced image for view on an LCD computer screen.

Also right click on your clip in the rack and look at properties. Is the clip in fact interlaced?
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Old July 18th, 2006, 09:31 AM   #4
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Quote:
Originally Posted by Ram Ganesh
I thot these appear only in *interlace* footage.. why am I getting this in progressive footage?
The SD 24p modes on the HD100 are just like the ones on the DVX100 -- the progressive-scanned images are stored in an interlaced 60i format, using either 2:3 or 2:3:3:2 cadence. Thus, there really is still some interlacing used to divide the frames evenly between the fields. Stephen's suggestion will help make these invisible while you're editing, but they are actually needed internally (it helps make 24p look smoother).
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Old July 18th, 2006, 11:36 AM   #5
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Quote:
Originally Posted by Stephen L. Noe
Click the "Q" (quality inlay) button and select "High Quality" and then below that select "Odd Field". This will flatten an interlaced image for view on an LCD computer screen.

Also right click on your clip in the rack and look at properties. Is the clip in fact interlaced?
Yes - you are right, properties says "Interlaced - Yes (BT field first)" - I had no idea that this cam can shoot interlaced... I thot it shot progressive all the way...!

Here is the camera setup for this shot:
---VIDEO FORMAT---
FRAMERATE : 24
REC : DV-24PA
ASPECT : 16:9
HDV PB OUTPUT : NATIVE
PB TAPE : AUTO
OUTPUT TERMINAL: AUTO
SET UP : 7.5%
PAGE BACK
------

BTW, I used a old Panasonic PV-GS70 to capture the footage, as its a SD cam and I didnt want to use HD100's head -
would this have converted my progressive footage into interlaced?
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Old July 18th, 2006, 11:48 AM   #6
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Ram,

Are you sure this was recorded in 2:3:3:2 24PA mode and not standard 2:3 24P mode?
In "advanced" pulldown mode you should be able to capture and "throw away" the extra frames. Stephen, does Liquid do this during capture, or is there an additional step to create 23.98 from the 2:3:3:2 29.97 DV file?
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Old July 18th, 2006, 12:12 PM   #7
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Quote:
Originally Posted by Ram Ganesh
Here is the camera setup for this shot:
---VIDEO FORMAT---
FRAMERATE : 24
REC : DV-24PA
ASPECT : 16:9
HDV PB OUTPUT : NATIVE
PB TAPE : AUTO
OUTPUT TERMINAL: AUTO
SET UP : 7.5%
PAGE BACK
------
Out of curiosity, why does the camera have 7.5% setup selected?

Isn't all digital video shot at 0 setup?... with 7.5 setup added if and when the video was transferred to an analog signal....
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Old July 18th, 2006, 12:35 PM   #8
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Quote:
Originally Posted by Jack Walker
Out of curiosity, why does the camera have 7.5% setup selected?

Isn't all digital video shot at 0 setup?... with 7.5 setup added if and when the video was transferred to an analog signal....
It only applies to the composite out for NTSC signals, the digital image is unaffected by this menu setting. It is necessary to add setup in North America when viewing on a NTSC TV, but in Japan, keep it set to 0.
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Old July 18th, 2006, 12:47 PM   #9
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Quote:
Originally Posted by Tim Dashwood
It only applies to the composite out for NTSC signals, the digital image is unaffected by this menu setting. It is necessary to add setup in North America when viewing on a NTSC TV, but in Japan, keep it set to 0.
Yes, thank you. That's what I thought. In this case the camera was set at 7.5 for its analog outputs, but the setting had no bearing on what was recorded to tape and subsequently captured in this example.
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