-
General Frame Cadence question
We have HDV footage which was shot 23.98 on a JVC-HDV camcorder. The shooter dubbed it to DVCAM and after we upload a clip from the DVCAM, the cadence is three progressive frames then two interlaced frames. In a normal pulldown you would see three frames then a fourth frame followed by a duplicate frame. In the DVCAM dub there is no duplicate frame and the deck (I played the DVCAM dub in an M25U) says the DVCAM is 60i.
So what would you guess the original HDV framerate was, and is this a new pulldown, where there is no duplicate frame. Or is it something else?
Just being curious….can’t come up with an answer!
Rich Rubasch
Tilt Media -
3 Replies
-
Three progressive frames and then two interlaced frames is a traditional 3:2 pulldown.
A pulldown that duplicates every 4th frame is a 2:2:2:4 pulldown.
You called a 2:2:2:4 pulldown a “normal pulldown”.
In all reality, a 2:2:2:4 is typically an abnomal pulldown. Most people use a 3:2 pulldown to convert from 24P to 29.97. Panasonic products often use a 2:3:3:2 pulldown that they’ve labeled 24PA or 24P Advanced. Does the JVC camera really shoot at 2:2:2:4? I’ve never used that camera.
-Russ
-
I recall that when we would shoot 24 fps 35mm film we would always get back clips that had the three frames then a fourth frame with a dupe frame. I thought that was 3:2, not 2:2:2:4. The translation would be 3 frames then 2 same-frames, i.e. 3:2.
Hmmm….more research.
Anyone else?
Rich Rubasch
Tilt Media -
Here is a terrific resource for all these frame rate questions…
https://en.wikipedia.org/wiki/24p
Rich Rubasch
Tilt Media
Reply to this Discussion! Login or Sign Up