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Is DV footage interlaced?
I can’t seem to find a consistent answer to this question.
Is MiniDV footage captured using Premiere over FireWire and saved as a DV AVI interlaced?
When I use this footage in AE, do I need to deinterlace it before working with it?-Skye Sweeney
FLL Freak Productions
https://www.fll-freak.com -
4 Replies
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Sometimes — it depends on whether the camera was set to shoot progressive (non-interlaced).
Capture doesn’t change the interlaced status. It just copies data from tape storage (DV) to your hard drive.
If the footage is interlaced, and you want to distort it, blur it, scale it, move it vertically (everything except colour correction, I suppose) you need to make sure that AE separates fields as “lower field first” on import. Check the data on the thumbnail of the clip in the project window.
DV footage is always lower first. Other footage may be upper or lower first.
To tell if an imported clip is interlaced, interpret it again with field separation on, lower first (file>interpret footage>main). Alt-double-click on it in the project window. Step through the footage using the pageUp/Dn keys. If the footage changes on every click, it’s interlaced. If it jerks back and forth, the field order is wrong, and the footage should be re-interpreted with the other field order. If the footage changes every second click, it is not interlaced. If it does a weird 3-2 click thing, it is film footage that was converted to video. Look up “pulldown” in the docs.
Hope that helps,
Steve -
I believe it does help! I will run this experiment at home tonight.
-Skye Sweeney
FLL Freak Productions
https://www.fll-freak.com -
I believe Steve meant going frame by frame through a video-layer that’s slowed down 200%
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Nope. You can do it in the “footage window” that opens when you alt-double-click (opt-double-click) on a clip in the project window. It has more stuff than the QT window that opens when you just double-click on footage in the project window.
If the footage is progressive and field separation was off, it will advance on every click of the pageDn key.
If it’s progressive and field separation was on, it will advance every two clicks.
… and so on, as in my original post.
If you interpret an interlaced clip as field sep off, you should see a comb-like effect in areas of fast motion.Try doing it with an interlaced clip at different field interpretations.
Steve
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